I posted this thread
with concerns regarding high engine oil temperatures while towing. I was attempting to research what additional fluid cooling was included with the Trailer Tow Group IV package found on the 5.7L HEMI platform. According to the manufacture description, the Trailer Tow Group IV package includes "HD engine cooling" but doesn't specify exactly what that entails. While searching on this forum it appears there's much confusion as to what accessory fluid coolers actually exist and which engine/drivetrain components are using them. So during an oil change I did some investigation and wanted to share my findings and evidence.
Vehicle - 2011 JGC Overland 4X4 5.7L HEMI with Trailer Tow Group IV package.
What I found on this model is the following:
- A transmission fluid cooler exists. The cooling radiator appears to be shared with the AC condenser all in one enclosed unit. The top section appears to service the transmission while the bottom is used for AC coolant. The Transmission cooler lines exit the tranny on the passenger side where a combination of hard and soft lines interconnect the cooler.
- An external 2-row power steering cooler exists. It's slapped onto the front of the AC condenser and is the forward most radiator on the front of the vehicle. You can visually see this unit through the front grill at the bottom of the radiator stack. The coolant lines run from the steering box to the fluid cooler a short distance up the driver side.
- No engine oil cooler appears to exist. No additional fluid cooling lines were observed entering/departing the radiator stack and no oil filter sandwich adapter is present (like with the 6.4L HEMI).
This information supports the data statistics I collected during heavy towing. Transmission temp, even with heavy loads, got hot but never outside the tolerance of acceptable operation. Same with engine coolant temperature - hot but acceptable. Engine Oil temperature however, has a tendency to sky rocket as the motor builds heat. With no engine oil cooler, there's no way to release the heat and the engine has to rely on coolant (water) for general cooling.
My personal conclusion is that I'm going to be installing an engine oil cooler so that I can continue to use by JGC for towing. There are no "kits" specific to the JGC so a custom install of a universal kit will be required. Wish me luck!
Transmission cooler lines traced:
Transmission hard lines coming out of the tranny.
Transmission hard lines traveling up to front of engine bay.
Transmission hard lines flexible section, making transition from drivetrain to unibody.
Transmission hard lines going up to AC condenser.
Transmission hard lines going into AC condenser.
Power Steering cooler lines traced:
2-row Power steering fluid cooler attached to front of AC condensor.
Power steering hard lines into steering box.
Power steering lines going to front cooler.
Power steering lines going into cooler.
Engine Oil Filter Receiver:
Engine oil filter receiver (no sandwich adapter or cooler lines)