Radiator fan/overheating at idle

MICHAELDAHLEN

MEMBER
2005 JEEP GRAND CHEROKEE
3.7L
V6
4WD
AUTOMATIC
150,000 MILES

Overheating at idle.
A/C blowing warm when at idle.
Radiator fan does not turn on when overheating.
Cools down and runs at normal temperature when driving.

Sunday, July 21st, 2019 AT 5:51 AM

7 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,756 POSTS

Hello,

It sounds like you have a fuse or a relay that is not working but to be sure here are two guides and the cooling fan wiring diagrams so you can see how the system works along with the fuse the relay locations.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what you find.

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Monday, July 22nd, 2019 AT 2:48 PM

MICHAELDAHLEN

MEMBER
4 POSTS

Thanks for the diagrams. I found the relay's but I dont see a fuse for the cooling fan anywhere. Would it be on the fan area?

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Monday, July 22nd, 2019 AT 3:06 PM

KEN L

MASTER CERTIFIED MECHANIC
47,756 POSTS

They are fuse #20 and #24 in the under hood fuse panel. Check them for power on both sides of the fuse. Let me know

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Tuesday, July 23rd, 2019 AT 12:44 PM

MICHAELDAHLEN

MEMBER
4 POSTS

20 and 24 are good fuses.

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Tuesday, July 23rd, 2019 AT 4:17 PM

KEN L

MASTER CERTIFIED MECHANIC
47,756 POSTS

Good job now there are two relays (high and low) that need to be checked which are located in the fuse panel under hood. Here is a guide use the diagrams from the post above to see the location.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please run down this guide and report back.