Cooler Towing Dot Com

07/28/2025

Another happy customer!

"So much better than I thought and should have done it earlier.

Just got back from pulling our 17k lbs 5th wheel toy hauler almost 400 miles that included some big summits that I normally would have to go down to 3rd gear taking it easy with the throttle while keeping the rpms up and sill hit 250 and above. This time I wasn't being as conservative so I could test it a bit and the highest it got was 230 for just a bit with outside temperature in the high 80s low 90s, that was the highest temp for the entire trip. Crusing 70 on the flat it would average 197.
Worst part for me was getting the lower radiator hose trimmed to avoid kinking.

Thanks "

04/21/2025

Finally got the bumper cleaned up and painted. Many thanks Matt Wiggins !

01/14/2025

Part 4 of the installation series is finally on YouTube. Many thanks to my awesome brother-in-law Josh Barker for the help!

Part 4 in the installation series of the auxiliary radiator for the 2005 Duramax equipped Chevrolet and GMC trucks

08/30/2024

Labor Day sale! Free shipping on your first order placed on the website between Friday and Monday! Use coupon code FREESHIP

07/20/2024

Another test run on the new auxiliary radiator kit for the duramax powered C5500 chassis motor home.

"MH ran like a champ temps.never got more then 222 which was rare . EGTs were still an issue but I just had to let off a little. 3000+ miles from AZ to WY"

Another success!

06/27/2024

Thanks to my awesome sister and brother in law we now have an installation video for the 2004-2007 kit! Part 4 is coming soon!

Overview and installation video of the auxiliary radiator system on a Duramax diesel equipped 2005 Chevrolet Silverado.

06/20/2024

Many thanks to my talented sister Atti for the new logo!

05/19/2024

We finally had a day warm enough for a real test of the new auxiliary radiator system for the c5500 chassis.

Test is complete!!
Left this afternoon at 3pm and went to Payson. We loaded the family plus hooked up the jeep to give it the most accurate test. It was 100 degrees when we left. Speed up all hills maintained 45+ before it was around 35 because motorhome would heat up. The hottest it got was 221. Only reason I had to let off was because of EGT temps. Attached is a few screen shots of edge. When it hit 221 it was only for a brief time then would scream down when I wasn't in it.

10/27/2023

Our most recent project. Duramax powered C5500 chassis.

07/14/2023

1st real test of the auxiliary radiator and transmission cooler on the books. We picked the right day and time too as it was about 2 in the afternoon and about 115 in Phoenix when we decided to head out and was still 100 in flag when we arrived. We maintained 65mph over most of the trip slowing to 50 on the steep climbs (due to other traffic). Stock gears with 35's make towing between 55 and 60 awkward (too fast for second gear and too slow for third which leads to egt issues).
As for the performance of the cooling system we couldn't be happier. Ect's stayed in the 200-205 range with the highest temp recorded at 214 with the fan cycling on and off as I would expect but never went into full lock up. Transmission also really seems to like the additional heat exchangers as it stayed in the 175-180 range the entire trip.
Specifics on the truck;
2006 srw 3500 megacab with a built 48re
5.9 cummins with 185k on the odometer
BD cobra compound turbos
30% over injectors
EFI live
Head studs
Valve springs
Pushrods
Coolant bypass
Oem transmission heat exchanger delete
Leveling kit with 35" tires