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Derale Snap-In Radiator Adapter Fitting for GM

Derale Snap-In Radiator Adapter Fitting for GM

Item # D13035
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D13035 - Radiator Adapters Derale Accessories and Parts
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Quickly and easily install your new transmission cooler without having to go through the hassle of cutting and flaring lines. Fittings are designed to work specifically with your vehicle's radiator. 1-800-940-8924 to order Derale accessories and parts part number D13035 or order online at Free expert support on all Derale products. Great prices and Fastest Shipping for Derale Snap-In Radiator Adapter Fitting for GM. Accessories and Parts reviews from real customers.
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  • Reviews (246)
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Derale Accessories and Parts - D13035

  • Transmission Coolers
  • Radiator Adapters
  • Derale

Quickly and easily install your new transmission cooler without having to go through the hassle of cutting and flaring lines. Fittings are designed to work specifically with your vehicle's radiator.


  • Connects radiator to transmission cooler quickly and easily - no cutting or flaring lines
  • Designed to snap into place easily
  • Aluminum construction
  • 1-Year warranty

13035 Derale GM Radiator Adapter
Hidden Hitch # HH41418
Hayden Automotive # 397

Video of Derale Snap-In Radiator Adapter Fitting for GM

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Derale Snap In Radiator Adapter Fitting Installation

We're going to show you how to install the Derale Factory GM Adapter, part number D1303l5, which helps us out, because it means we don't have to cut or alter anything on the vehicle as far as factory connections. Now, to slide this into our hose, we're going to wrap it up with a nice, soft cloth, just like that. Then maybe use a pair of pliers or something to hold it. You don't want to mar it, you don't want to scar it, because it makes the seal inside of there . Then we'll just kind of .. There will be good.

We'll have plenty of room here for our hose clamp. Slide that down on and tighten it up. Now we can take our adapter and slide it right into the back of the radiator, and re-secure it with the clip. That's going to complete today's installation of the Derale Factory GM Adapter, part number D13035.

Customer Satisfaction Score:

Customer Reviews

Derale Snap-In Radiator Adapter Fitting for GM - D13035

Average Customer Rating:  4.8 out of 5 stars   (246 Customer Reviews)

Quickly and easily install your new transmission cooler without having to go through the hassle of cutting and flaring lines. Fittings are designed to work specifically with your vehicle's radiator.


What I needed to install the Derale transmission cooler as a secondary cooler on my 2010 Suburban.


Based on how this felt after installation, I was sure it was going to leak. I'm glad I was wrong. It works wonderfully.


Hello. I ordered your products for both my wife"s 2011 Chevy Suburban and my 2008 Chevy Silverado. My Silverado also needed the the trailer wiring which I also obtained from you. Thank you for outstanding customer service and great products. Delivery times were great as well. Please find atached pics of install in the Suburban.


Auxiliary radiator works great and was very easy to install after looking at etrailers video online.
I would have given it 5 Stars if the cheap piece of hose that came with the kit had not blown on the way home from work and sprayed all my trans fluid under the highway.


This made the installation so much easier. I hate cutting into any automotive lines (brake,coolant,transmission). Initially it doesn’t look like it will work but it does, no leaks.


This adaptor was a must for the cooler installation as the adaptor included with the cooler kit did not fit my vehicle. This alloy adaptor was not listed for fit on my 2017 GMC Sierra. I contacted the manufacturer and they could not verify fit. I purchased the adaptor anyhow and compared gage measure to the original tube fitting on my vehicle and it was the exact fit. I would prefer the adapter be another 1/2"- 3/4" longer as I used two hose clamps at each hose connection on my installation to insure good seal.

Stephen D.


The adaptor is working perfectly..No leaks!


The transmission radiator , was a involved install, changed to a set of brackets, aluminum, to free float the radiator between the A/C dryer and Louvered shutters of the truck. Didn’t like connecting the two together for thinking heat sinking possibilities and become less effective. Was running at 139F, now 105F.
Your install video was very helpful to my planning and how I was going to do it. Install was on a 2020 GMC Canyon.


I used this snap-in connector fitting in the Grand Caravan when I installed the Derale 8000 transmission oil cooler. Snap-in fitting worked great in the return side. Reasonably priced and quick shipping. Now I'll have to install a cooler in the daughter's van too! Thanks etrailer for the excellent support and products.


Correctly worked from install, easy-to-use push-in fitting.


Works as expected, although the snap ring was hard to put back on. Maybe just that my fingers are too big to hold onto it and get it installed. Only thing better would be if it came with a second snap ring, I lost mine for about 20 min on the ground since it popped off while uninstalling the original pipe.


Exactly what we were after, perfect!


Snapped right in!



Still works fine. Hasnt leaked yet


Product was exactly as described. Easily snapped into place where stock transmission line fit, and provided a simple way to add an addition transmission cooler with no cutting or awkward fittings

Casey A.


Part works as described. Im happy.


I ordered a transmission cooler for my '09 Tahoe that, even with the small cooler for the towing package, just could not handle the California/Oregon mountains. I had my trusted mechanic install it (he has much greater expertise than I). I've just returned from an identical trip over those same mountains. What a difference! Instead of topping out at 230 degrees (dangerous), I topped out at 183, only 13 degrees from normal operating temp. I ordered the cooler and installation hardware. It's been awesome not to have to worry anymore about transmission burn out hauling my trailer that is 25% BELOW advertised towing capacity of this vehicle. Kudos to etrailer for offering such great products!


I received the cooler and Snap-In radiator adapter and thankfully it was sooner than expected. Everything was in order except that the cooler hose was 5/16" ID and the cooler and adapter are 3/8". Since the hose was not long enough (I needed 6ft) I was going to have to purchase hose anyway.
Everything works fine on my 2011 Chevy Traverse but unfortunately I neglected to take photos of the installation. However as a note for other Traverse Installers it is necessary to remove the front clip in order to gain access to the radiator. I made my own bracket to hold the cooler and mounted it in front of the AC condenser on the steel bumper which is accessible after the fascia (clip) is removed. I do not like the direct contact with the condenser. The bracket is bolted to the bumper as I drilled and tapped holes for the mounting points.
The clip is easy to remove after removing the inner fender guards. The factory manual suggests using a plastic wedge to unsnap the fascia below the headlamps. I used a plastic one that is used for installing glass/window seals.
It wasn't a quick install but not too difficult either. A significant part of the time spent involved the design,cutting and welding of the bracket.


This is exactly what is needed to install a transmission cooler on a 2017 GMC Canyon diesel.



Absolutely no problems or leaks with this product.


Installed this in my 2008 Avalanche, utilizing the following kit:
D13504 - This cooler
D13002 - Mounts
D13003 - Extra hose
D13035 - GM adapter

Everything went well, took the longest time just figuring how I wanted it mounted in the front to make me happy, second to the time spent was of course removing the front fascia of the car. Once I got it in place the only extra things I needed were some P-clips for hose mounting, some split loom and zip ties(my necessity to prevent chafing ever). The GM adapter went in fine, was a bit leery of how 'loose' it felt even after being clipped in, it does move in and out about a 1/4" but this is normal and no leaks present, just make sure the clip retains the adapter. Pushing the new hose on the old hard line that went to the radiator is a bit of a bear, use lube on all your hose barbed ends to ensure easy insertion. Also when mounting the cooler, some screws were attached to the bracing of the car, pre-drilling those holes with a small bit helps tremendously, rather than risk trying to drive a self tapper in with force, slipping and putting a hole in your condenser.
After install, transmission is running about 30-40 degrees cooler in normal city driving, will test to see how it does with a tow load. Under towing I would get up to just shy of 220 degrees in the Florida heat, hoping to see it stay below 190 under load.


Worked out great for installing the extra trans cooler.

Anthony H.


No leaks still doing its job


Worked easily and perfectly for my 2008 Chevy TrailBlazer 4.2L with built-in transmission cooler, in order to connect to my additional Derale D13504 cooler using 11/32" hose. I was surprised that it didn't leak at all, as it snapped in so easily and could be spun, but it hasn't leaked in the year since I put it in.


I bought this because the transmission temp in my 2013 Avalanche was hitting 220 when towing a boat. Which seems high. After researching I found that transmissions in those models are ok up to a maximum of 275 degrees (which seems crazy but it is rated that high from chevy. There’s a website called that has a lot of info ). I installed this product and it worked really well. Easy install with the video if you have mechanical ability. Dropped temps by about 30 degrees. Still working great no problems. Only concern I have is that the transmission temp stays pretty low in the winter. It’s working well though. I would highly recommend this product. Good products, good service!


Fit perfectly! I have a 2014 silverado 1500 ltz with a tow package. The location of the trans cooler line is different than any DIY video you have but I found it and everything I recieved from Etrailer went together seamlessly.

E-trailer is my one stop shop for everything travel trailer.


This is the exact part you will need to install transmission cooler on your GM vehicle. It connects the return hose to the factory cooler. I forgot to order it and then realized after watching some videos and reading reviews like this and luckily ordered it before the install. Great product. That was my first install of a trans cooler and I would have been stressed and baffled without this part. If you have a GM get it! Also, I saw it available elsewhere but this site is great and fast.


This little adapter is fantastic. I used it for both my draining of the transmission (pumping out fluid) and for connecting my add-on transmission cooler. Made installation a breeze with no requirement to cut and flare the existing lines.


We have been very happy with the performance of the transmission cooler. There was a significant drop in transmission temperature after replacing the stock cooler with your product when pulling our camper. Very easy to install on our Chevy pickup.


This is a customer service review not a product review.
Leeza J. was very helpful in helping me get everything needed for adding a secondary transmission cooler to my Chevy truck. I ordered 3 different items and the one item was not in stock and I was promised that I would be notified when it arrived. I was notified that the item was in stock 2 days later and I received the package a few days after that. Very good service that impressed me.

Show More Reviews

See what our Experts say about this Derale Accessories and Parts

  • How to Determine Which Line is the Return Line for Installing Supplemental Transmission Cooler
    In order to tell which transmission fluid line is the return line leaving the factory cooler of a vehicle like your 2001 Chevy Silverado you want to start with your vehicle cold. Start it up and put it in drive and brake torque it (apply brakes and rev the engine), for about 10 seconds or so, put vehicle back in park, and turn engine off. Now quickly go out and feel both transmission lines. The cooler of the two is the return line and the one to use for installing the # D13035.
    view full answer...
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  • Recommended Transmission Quick Disconnect Adapter for a 2016 Jeep Grand Cherokee
    I believe what could possibly work for you is the Derale Snap-In Radiator Adapter Fitting for GM # D13035 which measures 2" overall, .48" on the larger flare side, .43" on the smaller end, is .37" in diameter, and has a .27" opening. I've attached a diagram of this adapter for you to check out as well.
    view full answer...
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  • What are the Measurements of the Derale Snap-In Radiator Adapter Fitting, # D13035
    I went out to the warehouse and pulled a Derale Snap-In Radiator Adapter Fitting, # D13035, to take some measurements for you. The overall length is 2 inches. The larger flare is approximately 0.48 inches in diameter and the smaller flange is 0.43 inches in diameter. The diameter of the main body is 0.37 inches. And finally the diameter of the opening on either end is 0.27 inches. I produced a picture that shows the dimensions for you.
    view full answer...
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  • Does Derale Snap-In Radiator Adapter Fitting Come In 90 Degree Angle
    The Derale Snap-In Radiator Adapter Fitting # D13035 that you referenced is not available in a 90 degree angle. If you need to have a sharp angle like this your best option is just going to be to create it using the flexible line on the other end of the fitting. I have attached a short video review on this particular product that you can check out as well.
    view full answer...
  • Transmission Cooler Install Adapter Recommendation for 2005 GMC Yukon XL
    When installing a transmission cooler in your 2005 GMC Yukon XL like the Flexalite kit part FLX4126 the correct snap in adapter you'd want is the part # D13035. This will make installing the cooler much easier. I attached an install video for this adapter for you to check out as well.
    view full answer...
  • Will the Derale Snap-In Radiator Adapters work for my 2018 GMC Sierra.
    Yes the Derale Snap-In Radiator Adapter Fitting for GM part # D13035 is designed to fit your 2018 GMC Sierra 1500 and will work with the Derale Transmission coolers. Check out the video showing their installation below.
    view full answer...
  • What Is The Derale Snap-In Radiator Adapter Fitting Made Of
    The Derale Snap-In Radiator Adapter Fitting for GM # D13035 you reference is in fact made of aluminum, and is just as strong and resistant to heat as before.
    view full answer...
  • How Many Derale Snap-In Radiator Adapter Fitting for GM, # D13035 are Needed on a 2010 GMC Canyon
    To install a Derale transmission cooler on your 2010 GMC Canyon you will need one of the Derale Snap-In Radiator Adapter Fitting for GM, # D13035. This will snap into the factory transmission coolers output fitting to allow you to run the coolant line from it without having to cut or flare the original fitting on the factory cooler. When installing a transmission cooler on your vehicle you will want to measure the area in front of your radiator to find out what size cooler will fit. I...
    view full answer...
  • How to Install the Derale Snap-In Radiator Adapter on a 2008 Chevrolet Suburban
    The original transmission cooler line is held in by an E clip. Once you locate the E clip at the radiator housing you will need to push in on the transmission cooler return line, and use a awl or small screwdriver to pry the E clip off of the line. The transmission line will then come out of the radiator housing. You will then install the Derale Snap-In Radiator Adapter, item # D13035, using the E clip to hold the fitting in place. If this fitting leaks, an O-Ring in the radiator at this...
    view full answer...
  • Fitting Needed to Install Transmission Cooler on 2003 Chevy Silverado Without Cutting Lines
    The Derale # D13035 you'd looked at is the fitting you'll need to install a transmission cooler like # D12903 on your 2003 Chevy Silverado 1500. The # D13035 will allow you to install a transmission cooler without cutting the existing transmission lines, as you can see in the video I've linked for you. The video shows a transmission cooler being installed on a 2003 Chevy Avalanche, but the procedure would be identical for your Silverado.
    view full answer...
  • Determining Which Transmission Line is Return Line of 1993 GMC 1500
    While I wasn't able to get you the exact answer I can help you easily identify which transmission line is which on your truck. 1. Start engine while engine is cold 2. Place transmission shift lever in drive for no more than 10 seconds. 3. Stop engine and remove keys 4. Identify the oil return line by feeling both oil lines. The coolest line is the oil return line and the one to install the transmission cooler on.
    view full answer...
  • Which is Transmission Fluid Return Line on Radiator of 2000 Chevy Silverado
    On your radiator the top port on the radiator is the inlet and the bottom is outlet. Here's a fool proof way to check and be sure though. In order to tell which transmission fluid line is the return line leaving the factory cooler of a vehicle like your 2000 Chevy Silverado you want to start with your vehicle cold. Start it up and put it in drive and brake torque it (apply brakes and rev the engine), for about 10 seconds or so, put vehicle back in park, and turn engine off. Now quickly...
    view full answer...
  • Which Transmission Fluid Line of Turbo 350 is Return Line
    On a GM Turbo 350 transmission the bottom line is the return line and the one to install a transmission cooler on. The top one is the send line.
    view full answer...
  • Attaching Hose to Transmission Lines When Installing Transmission Cooler on 2005 Chevy Suburban
    The hose from the aftermarket cooler would simply slip over the flare on the end of the line that was removed from the radiator. There will be enough play in the line so that it can be moved back from the radiator. Make sure you slip the hose onto the line far enough so that the flare will prevent the hose from backing off the line once its secured with a hose clamp. I have linked you to some FAQ articles about transmission coolers that you might find helpful.
    view full answer...
  • Recommended Transmission Cooler For Chevy Silverado 1500 With 4.8L Engine And Tow Package
    The regular transmission temperature on your 2012 Chevy Silverado seems a little high and it is a concern it jumps that much with such a light trailer load without an extreme grade. I recommend you install a transmission cooler to bring this temp down for towing. The best transmission cooler for you is the Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class III - Efficient # D13503. This cooler has furnace-brazed aluminum construction and 3/4 inch wide turbulator...
    view full answer...
  • How To Determine What Transmission Cooler Class to Choose
    The Class system used to differentiate transmission coolers is similar to the Class system associated with trailer hitch receivers. For example, a Class III trailer hitch is used for medium duty towing therefore, a Class III transmission cooler would suffice. However, when choosing a transmission cooler for your 2015 Chevy Silverado 1500 it is always recommended to choose the largest cooler you have space for in front of the radiator behind the grill as this will provide the transmission...
    view full answer...
  • Transmission Cooler Recommendation For 2009 Chevrolet Suburban
    The best way to pick out a transmission cooler for a vehicle is to go with the largest one available that will fit the available space in front of the radiator. I have attached a drawing that shows the best locations for a transmission cooler. The transmission cooler I recommend for your 2009 Suburban is the Derale Series 8000 Plate-Fin Transmission Cooler Kit, part # D13504. This is a Class lV plate-fin cooler that measures 11 inches wide x 12 inches tall and is 7/8 inches deep. You...
    view full answer...
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  • Should Derale Transmission Cooler Replace or Install at Same Time as Factory Vehicle Cooler
    The best way to use the Derale transmission cooler part # D13504 would be as a supplemental cooler to what you have now. This gives you the cooling power of both coolers. This is also the most common way people use coolers like this and would be what I would recommend for your 2010 Chevy Suburban. You will also need the snap-in radiator adapter part # D13035 to complete the install. This installs on the radiator and gives the lines fitting to attach to. I attached an install video for...
    view full answer...
  • Best Transmission Cooler for a 2014 GMC Yukon XL
    Yes, the Derale Stacked-Plate Transmission Cooler Kit, -6 AN Inlets - Class IV item # D13402 will work with your 2014 GMC Yukon XL. The best transmission cooler to use on your Yukon will be the largest one you have space available for in front of your radiator/condenser behind your grill. This transmission cooler is 13" wide x 6-7/16" tall x 2" deep. You will also want fitting item # D13035 to make the install easier.
    view full answer...
  • Transmission Cooler For A 2007 Chevrolet Suburban With A 5.3 L V8 Engine
    You can install any transmission cooler that can fit in the available space in front of the A/C condenser on your 2007 Chevrolet Suburban. The Derale Series 8000 Plate-Fin Transmission Cooler Kit # D13504 along with the hose kit # D13035 will work the best when lowering your transmission's operating temperature to help extend its life. This kit would be the most efficient cooler for your vehicle. This kit is specifically designed for Chevrolet Suburban's with a late-model, electronic...
    view full answer...
  • Using Fitting # D13035 to Install a Transmission Cooler on a 2004 Chevy Tahoe
    The adapter, # D13035, is recommended for use so you do not have to cut and flare the lines. It just so happens that in the video you mentioned our installer chose not to use the adapter. This is acceptable if you do not mind cutting and flaring lines but most people do not own the proper tools to flare steel lines (though you could borrow a tap and die set from an auto parts store). Aluminum lines could be flared with a screwdriver. I have linked a video that does show our installer using...
    view full answer...
  • Identifying Transmission Return Line for Installation of Derale Class V Cooler # D13614
    You want to install the Derale supplementary transmission cooler # D13614 on the return line from the radiator. You'll need Snap-In Radiator Adapter Fitting # D13035. To determine which line is the return line you will want to start with your truck totally cooled off. Start the truck and put it in drive, apply the brakes firmly and then apply the accelerator slightly so that the engine RPMs climb for a few moments. Put the truck back in park and shut it off. Now go out and feel the two...
    view full answer...
  • Transmission Cooler Recommendation for a 2010 GMC Yukon XL with 5.3 Liter Engine
    Derale transmission cooler # D13504 that you have referenced is a good choice. It is one of the most efficient coolers available and recommended for your 2010 GMC Yukon with the 5.3 liter engine. The only other item you would need is fitting # D13035 so you will not have to cut and flare lines to install the cooler. I have included a link to a video showing a typical installation for you and a link to our FAQ article on transmission cooler.
    view full answer...
  • Installing the Derale Series 8000 Kit # D13504 on a 2008 GMC Acadia SLT2 V6
    When installing the Derale Series 8000 Plate-Fin Transmission Cooler Kit # D13504 on your 2008 GMC Acadia SLT2 V6 there really is no "correct" way to orient the cooler as it can be mounted with the ports being up, down, left, or right as you mentioned. I have attached the installation instructions for you to check out, but for the hose connections you will need to do the following: 1. Disconnect the return transmission cooler line from the radiator. 2. Take the supplied Insta-dapt Adapter...
    view full answer...

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