BillNC

With lots of towing, transmission temp has never gotten over 170.

Jon, thanks for your help with this! My wife will be turning the transmission temp display on every time she tows. All blacktop. No mountains. Occasional trip from NC to Fla on I-95. She towed on back roads yesterday, about 12 miles each way and the highest temp was 197. How does one tune the cooling fans? Mike, the sales manager investigated the build a truck tool for the 2018 Silverado 1500. Apparently the transmission cooler in the condenser and the engine oil cooler in the radiator comes along with the 5.3 engine. If you look at the parts listings that I posted, it shows the same parts for 2017 and 2018.

2018 Silverado 1500 Engine Oil Cooler Lines.pdf 2018 Silverado Transmission Fluid Cooler Lines.pdf Over the weekend I visited gmpartsguys.com (they are also a dealership) to look for a GM auxiliary transmission cooler for our truck. I could not find one, so I emailed them the VIN number and the Build Sheet info. They just called me back and told me that I already had an auxiliary transmission fluid cooler. I explained that these parts drawings showed otherwise. He said he would call GM and then call me back. He called back and told me that GM said: My truck is not built with an auxiliary transmission cooler, and none are available. Kudos to gmpartsguys!

The top 7 horizontal bars in the condenser are thicker than the ones below. Missed that before. Thanks again.

I was thinking it should have both too. Looking through the grill, I did not see thicker plates at the top of the condenser. I've crawled under the truck and traced the engine oil lines and the transmission fluid lines. (Also wiped the oil off the bottom of the oil filter and tightened it by hand.) Engine oil lines run down the left side of the engine and tie into the radiator high and low on the right side. Freon lines tie into the condenser on the right side. Condenser appears to be the same size as the radiators. Transmission fluid lines run down the right side of the engine and tie into the right side of the condenser high, and the left side of the condenser high. I double checked this as best I could and I think the above is accurate. It's hard to see around all the cowling, etc. The engine oil is routed through the radiator. Maybe the condenser was upsized??? I'm going to ask the dealer for a link to an exploded parts diagram for my truck as built. Many thanks!

Two horse with dressing room. 5,850 lbs with one warmblood. Load equalizing hitch. Absolute max that would ever be towed would be 7,500 lbs. Truck is rated for 9,300 lbs. My wife towed this same trailer for 12 years with a F-150 rated at 8,500 lbs.

Thanks. I'll do that. Was the service manager right when she said that the truck did not also have a transmission cooler built into the radiator?

I am trying to determine if the new 2018 Silverado Crew 1500 that we just bought for towing a horse trailer has: (1) A transmission fluid cooler that is an integral part of the radiator, AND (2) An auxiliary transmission cooler that is located in the top of the AC condenser. Based on the Build Report and the GM Order Guide, and the thread I found here from 2014 or 2015, I believe that the truck has both the items above. But the service manager just emailed me back and said that the truck does not have (1) but does have (2). Build Report reads: "KNP - Transmission Oil Cooler" http://gmauthority.com/blog/wp-content/uploads/2017/06/2018-Chevrolet-Silverado-1500-SSV-Order-Guide.pdf The info below is cut and pasted from the above GM document. "KC4 Cooling, external engine oil cooler S S" "KNP Cooling, auxiliary external transmission oil cooler S S" "L83 Engine, 5.3L EcoTec3 V8 with Active Fuel Management, Direct Injection and Variable Valve Timing, includes aluminum block construction (355 hp [265 kW] @ 5600 rpm, 383 lb-ft of torque [518 Nm] @ 4100 rpm; more than 300 lb-ft of torque from 2000 to 5600 rpm)" Your help sorting this out would be greatly appreciated, Thanks, BillNC