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Derale Snap-In Radiator Adapter Fitting for GM

Derale Snap-In Radiator Adapter Fitting for GM

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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. Guaranteed Lowest Price and Fastest Shipping for Derale Snap-In Radiator Adapter Fitting for GM. Accessories and Parts reviews from real customers.
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  • Reviews (212)
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Derale Accessories and Parts

  • 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

Item # D13035

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 Reviews

Derale Snap-In Radiator Adapter Fitting for GM - D13035

Average Customer Rating:  4.8 out of 5 stars   (212 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.


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.


Very handy for unique installations fo transmission coolers


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.


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


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.


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.


It works and is convenient to have


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


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.


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.


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.


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


Exact part that was needed


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.


adapter was a perfect fit for 2004 Escalade ESV - allowed me to finish the installation. one year later no leaks!

still working greta, no leaks and install is solid. thanks!
JJ - 10/08/2020


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.


Worked out great for installing the extra trans cooler.

No leaks still doing its job
Anthony L - 08/11/2020


Couldn't install the radiator cooler without this part. It was a perfect fit and just what I needed. Over one year and 20k miles later there are no leaks or any other issues with this adapter.




Just what I need to complete the install on my 2009 Chevy Silverado.


I never used it. I eliminated the rad altogether ran the lines right to the trans cooler your cooler is working great. I tow a car and the temp never hits 170 great product. Thanks


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

Show More Reviews

Ask the Experts about this Derale Accessories and Parts

  • 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 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...
  • 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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  • 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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  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Installing Derale Series 8000 Transmission Cooler on 2001 Chevrolet Silverado
    I can certainly help you determine which line is the return line for your transmission fluid. Here is an easy way to figure if the top or the bottom line is the return for the transmission fluid. 1. With truck's engine cold, start the truck. 2. Shift transmission into Drive, but keep your foot on the brake. 3. With your foot on the brake, press the gas pedal to rev the engine. 4. Put truck in Park, stop engine, and remove keys. 5. Identify return line by carefully feeling both lines....
    view full answer...
  • Will Derale Transmission Cooler D13502 Fit a 2007 Chevy Silverado with 5.3 Liter Motor
    You certainly can add Derale transmission cooler # D13502 to your 2007 Chevy Silverado with 5.3 liter motor without any problems. The only accessory that I recommend with this is special fitting # D13035. If you use this fitting you won't have to cut then flare any transmission lines.
    view full answer...
  • Parts Needed for Installing a Derale # D13503 Transmission Cooler on 2010 Dodge Grand Caravan 3.3L
    To install the Derale Transmission Cooler # D13503 on your 2010 Dodge Grand Caravan you will also need one # D13035 adapter, which is sold separately from the # D13503 kit. This fitting will take the new Derale hose and adapt it to fit into your factory transmission cooler. We installed this exact transmission cooler on a 2013 Dodge Grand Caravan, which is in the same generation model as your 2010, so the install should be very similar. I have linked the video of this install for you...
    view full answer...
  • Transmission Cooler Recommendation for 2010 GMC Yukon XL
    Plate-fin coolers are the preferred transmission cooler style as they are much more efficient than the tube fin coolers. They are also much more durable as the tube fin style has fins that are easily bent. What I would recommend you do is keep your current cooler and then install a supplemental cooler like part # D13503 downstream of it so that you can maximize your cooling efficiency. You will want the fitting part # D13035 to make the install of the cooler easier. This prevents you from...
    view full answer...
  • Transmission Cooler for 2007 Chevy Suburban with 5.3L V8 Engine
    On your 2007 Chevy Suburban with the 5.3L V8 you can install any transmission cooler that can fit in the available space in front of the A/C condenser. This is the best location to mount one. Coolers are not vehicle-specific so any cooler for which you have sufficient mounting space can be installed so long as the transmission has external lines to allow you to tap into the system. Larger coolers work better than smaller ones so a unit like the efficient Class IV Derale # D13504 along...
    view full answer...
  • Transmission Cooler Recommendation for 2007 GMC Yukon Denali
    The transmission cooler part # D13504 would be exactly what you need. This is a large cooler that would work well for your 2007 GMC Yukon Denali. I attached an install video that shows it being installed in a very similar 2009 Yukon as yours. Your engine temperature doesn't really seem that bad at all. But the transmission cooler will help slightly with that since it will allow the factory transmission cooler to run cooler as well which is connected to the radiator. Also the transmission...
    view full answer...
  • Derale Transmission Cooler Fit for 2007 Chevrolet Silverado 5.3L
    Transmission and oil coolers are not vehicle-specific. A transmission cooler can be installed in a vehicle so long as you have space to mount it in an appropriate location where it will receive proper air flow. You are correct that we do not show the 5.3L option among the engines offered for your 2007 Silverado. I checked our performance tuner applications and indeed the 5.3L appears there so it is likely just an oversight. My contact at Derale confirmed they know of no reason cooler...
    view full answer...
  • Recommended Transmission Cooler for 2009 Chevy Suburban with 5.3L Engine
    For your 2009 Chevrolet Suburban with a 5.3L engine, you can still install any transmission cooler that will fit in the available space between the grille and A/C condenser. Transmission coolers are not vehicle-specific, so any cooler for which you have the proper mounting space can be installed as long as the transmission has external lines to allow you to tap into the system. I recommend taking a look at the Derale Transmission Cooler # D13503. This is an excellent and efficient heat...
    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...
  • Recommended Transmission Cooler for 2008 Chevy Silverado
    I recommend the Derale Series 8000 Plate-Fin Transmission Cooler # D13503 for your 2008 Chevy Silverado; you'll need Derale Snap-In Radiator Adapter Fitting # D13035 as well. This is a highly efficient, direct-fit cooler that comes with a mounting kit and is very highly regarded by our customers who have used it, as you can see in the reviews on the product page. I've add links to a video review and install for you to take a look at.
    view full answer...
  • Is Derale Transmission Cooler # D13504 A Good Fit for 2013 Chevy Suburban
    The Derale # D13504 is a great option for your 2013 Chevy Suburban. We organize them by typical application but the bigger the cooler you can fit the better and this is a great size for your vehicle. You'll want the adapter part # D13035 as well too to make installing the cooler easier.
    view full answer...
  • 2008 Chevy Silverado 5.3 4x4 4L60E Transmission Cooler
    The cooler you can keep the 4L60E of your 2008 Chevy Silverado the longer it will last. The part # D13503 with the fitting kit part # D13035 would be the way to go. This cooler measures 11" Wide x 8-3/4" tall x 7/8" deep and if installed after your factory cooler it would do an excellent job keeping the fluid cool to prolong the life.
    view full answer...
    Image 1 for
  • Recommended Transmission Cooler For 2010 GMC Sierra Denali 6.2L V8
    For your 2010 GMC Sierra Denali 6.2L V8, I recommend the Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class IV - Efficient # D13504. This cooler is a plate-fin style which allows for greater heat dissipation without compromising unit strength. It has furnace-brazed aluminum construction and 3/4inch wide turbulator plates for more effecient cooling. You will need the 2010 GMC Sierra Derale Snap-In Radiator Adapter Fitting for GM, # D13035 for this installation...
    view full answer...

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