2012 Jeep Grand Cherokee overland 5.7 Hemi over heat at idle
Asked by Lylelee91 Dec 29, 2018 at 04:25 PM about the 2012 Jeep Grand Cherokee Overland 4WD
Question type: Maintenance & Repair
My Jeep Grand Cherokee with 5.7 Hemi
overheats only at a idle runs fine down the
road as soon as I stop it over heats cooling
fan wont kick on replaced thermostat and
water pump not losing any antifreeze nothing
is leaking and oil is clean
5 Answers
Also had it tested fan tested good and pressure test only showed leaking water pump radiator stays full good pressure on system bleed and burped multiple time help please lol
Hornet_2497 answered 5 years ago
That one's easy. The answer is hiding in your question. If the fans don't come on at low speeds, there is little heat exchange at the radiator and the coolant gets hot and can't cool the engine. At high speeds, the air flow is plentiful and fans are off. Go to the under hood electrical distribution box and check/replace yellow fuse cartridge #J19, rated 60 amps. If that's not it, your fans run hi/low on a coolant temperature sensor, and possible a relay. The fan motor itself may have failed but check the fuse first. Tell us what you find.
I checked fuse and tested fan at shop tested good so I’m not sure what relay it would be but I know it’s a fan not running issue
I checked fuse and tested fan at shop tested good so I’m not sure what relay it would be but I know it’s a fan not running issue
Another twist with radiator cap lose fan runs fine
