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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. 1-800-496-5010 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 (223)
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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   (223 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.


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.

The adaptor is working perfectly..No leaks!
Stephen D - 11/04/2022


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.


The order arrived on time and complete. The items fit, keeping in mind this is a universal cooler. I made lower brackets which allowed the unit to bolt on.


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


Very handy for unique installations fo transmission coolers


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.


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.


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.


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.


I didn't end up having to use it, didn't need it. Shipping was quick, everything else I ordered worked perfectly.


Worked great. I used some small angle iron.. The holes
are the spacing as the cooler.. Used 2 self tapping screws


It works and is convenient to have


Perfect for the Yukon 07


Snapped right in!


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.


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

Part works as described. Im happy.
Casey A - 08/29/2016


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!


fast shipping, great products


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.


Exact part that was needed


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

Absolutely no problems or leaks with this product.
Jim - 07/20/2019


This product fits as it is supposed to. It is difficult to slide the hoses over the end but as other reviewers have mentioned this is actually probably a good thing to help form a tight seal. Also removal of the retaining C-clip from the existing connection is difficult under tight conditions and it is easy to lose that clip. The intent is for the clip to be re-used but that isn't exactly realistic in all situations, so I believe that a new clip should be provided with this product. That would have saved me a trip to the auto parts store during the install!


I used this to install external cooler on 2008 Chevy Silverado LT with 5.3. I have clip style fittings for transmission lines into radiator and this adapter was needed. It worked. No leaks one year later. Very happy.


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.

Show More Reviews

See what our Experts say about this Derale Accessories and Parts

  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
    Image 1 for
  • 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...
  • 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...
  • 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...
  • 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...
    Image 1 for
  • 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...
  • WhichTransmission Cooler Fittings for a 2007 GMC Truck
    I spoke with my contact at the manufacturer and he said that there are 3 main types of fittings that GM used during that year and that it was more or less random for the GM trucks so you may need any one of the three types. The three types are the fittings that were used are the fitting supplied with the cooler, a snap in style fitting, item # D13035, and the Derale Radiator Adapter Fittings for GM, item # D13018. I believe the last style of fitting is the fitting your truck will need....
    view full answer...
  • Installation Instruction Help For Derale Transmission Cooler # D13504 on a 2007 Chevy Avalanche
    To help you install the Derale Transmission Cooler # D13504 on your 2007 Chevrolet Avalanche, I was able to locate a similar installation video as well as the actual installation instructions, both of which can assist you. To give you a better feel of the installation process, the video I have attached is a similar transmission cooler from Derale, part # D12906 on a 2005 Chevy Avalanche - according to my contact at Derale, the installation of the # D12906 is almost identical to the installation...
    view full answer...
  • Transmission Cooler Recommended for 2003 GMC Envoy
    Typically, the transmission lines make a loop through the radiator so if you're working your SUV hard while towing, you'd certainly benefit from a transmission cooler. Unless you live way up north where it gets seriously cold, it's difficult to over-cool a transmission. The best spot to mount a cooler is directly behind the grille in front of the radiator, so we typically recommend choosing the largest cooler that will fit into the available space. The Derale # D13504 measures 11 x 12...
    view full answer...
  • Transmission Cooler Recommendation for 2013 Chevy Silverado 1500 5.3 liter
    The Derale transmission cooler part # D13503 is a really great choice for your 2013 Chevy Silverado 1500 with a 5.3 liter engine. It's a larger sized cooler that is a very efficient design which means it will do a great job keeping the transmission fluid cooler which will also prolong the life of the transmission. To install this you'll also need the snap in adapter part # D13035 and you'd be set.
    view full answer...
  • Transmission Cooler Installation Time on a 2016 GMC Canyon
    I would rate the Derale Series 8000 Plate-Fin Transmission Cooler Kit # D13503 and Adapter Fitting for GM # D13035 at approximately a 1.5-3 hour installation on your 2016 GMC Canyon, depending on the installers skill level.
    view full answer...
  • Transmission Cooler and Radiator Adapter Fitting for 2016 Dodge Grand Caravan
    The Derale # D13612 will work just fine for your 2016 Dodge Grand Caravan. The cooler includes the hose, hose clamps and necessary hardware for installation, but you'll also need the # D13035 adapter fitting. The cooler would install inline with the return line from the radiator to the transmission as shown in the provided video which will walk you through the installation process. The video shows a slightly different cooler being used, but the procedure would be just about identical with...
    view full answer...
  • Recommended Transmission Cooler for a 2016 Chevy Traverse
    The transmission cooler I recommend for a 2016 Chevrolet Traverse is the Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets part # D13502. The Derale Snap-In Radiator Adapter Fitting part # D13035 may also be able to be utilized but splicing will be required regardless. There is no such thing as a plug-in-play supplemental transmission cooler.
    view full answer...
  • Fitting for Installing Derale D13503 Transmission Cooler on 2017 Jeep Grand Cherokee
    To install a transmission cooler on your 2017 Jeep Grand Cherokee, you'll need the # D13035 snap-In transmission fitting which will work perfectly with the Derale # D13503 transmission cooler you referenced. Our product description lists it as being for a GM vehicle, but it also fits several MOPAR applications. I've linked to an install video showing a slightly smaller cooler being installed on a 2018 Grand Cherokee, which shows exactly how the # D13035 fitting is used. I've also linked...
    view full answer...
  • Recommended Transmission Cooler for 2007 Chevy SIlverado 1500 with 6.0L V8
    On your 2007 GMC Sierra 1500 with 6.0L, we don't recommend replacing the factory transmission cooler unless you have to based on space but rather adding another inline cooler with it to further cool your transmission. I recommend the Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class IV - Efficient # D13504 along with the Derale Snap-In Radiator Adapter Fitting for GM # D13035.
    view full answer...
  • Adapter Needed To Install Derale Transmission Cooler On 2016 Chevy Silverado 5.3
    The Derale 19-Row Stacked-Plate Transmission Cooler Kit, -6 AN Inlets - Class V # D13403 is a great option for your 2016 Chevy Silverado with the 5.3 V8. This does fit most vehicles with the 5/16" transmission lines, but I recommend adding the Derale Snap-In Radiator Adapter Fitting for GM # D13035. This adapter allows you to easily connect the radiator to the transmission cooler. I attached a demonstration video for you.
    view full answer...
  • How To Install Derale Transmission Cooler While Keeping OEM Cooler On 2007 GMC Yukon Denali XL
    I sure can! What you will need to do to install the Derale Transmission Cooler # D13504 you were looking at while still keeping the factory transmission cooler on your 2007 Yukon Denali XL you will remove the driver side line from the factory trailer connector. You will then attach one side of the # D13504 to the factory cooler using GM Adapter # D13035. The other line of from the # D13504 will get connected to the factory transmission cooler line you removed. You can see all of this...
    view full answer...

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