# Radiator fan will not stop **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** fans, radiators\ **Created:** [May 3, 2009, 6:32pm UTC](https://community.cartalk.com/t/radiator-fan-will-not-stop/29966 "2009-05-03T18:32:03Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![bisstess](https://avatars.discourse-cdn.com/v4/letter/b/8dc957/32.png) [@bisstess](https://community.cartalk.com/u/bisstess)\ **Post date:** [May 3, 2009, 6:32pm UTC](https://community.cartalk.com/t/radiator-fan-will-not-stop/29966/1 "2009-05-03T18:32:03Z")
1988 Cadillac Sedan DeVille. Automatic. Father in laws car, he called me needing a jump. The radiator fans were running even with car off. I replaced the temperature sensor and the fan relay. Fans still run. Does anyone else have any suggestions? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [May 3, 2009, 6:57pm UTC](https://community.cartalk.com/t/radiator-fan-will-not-stop/29966/2 "2009-05-03T18:57:00Z")
There’s a few more relays to check out in this circuit. Low speed fan relay. Medium speed fan relay. High speed fan relay. All located on the left side of the engine compartment. There’s also another coolant fan relay behind the right side of the instrument panel. And finally, every relay is controlled through the body control computer. So that’s also a possibilty. Tester ---
**Author:** ![bisstess](https://avatars.discourse-cdn.com/v4/letter/b/8dc957/32.png) [@bisstess](https://community.cartalk.com/u/bisstess)\ **Post date:** [May 3, 2009, 7:09pm UTC](https://community.cartalk.com/t/radiator-fan-will-not-stop/29966/3 "2009-05-03T19:09:19Z")
The relay that I replaced was the coolant fan relay behind the right side of the instrument panel. Are the other three relays just behind the battery on the drivers side? I am hoping that it is not the computer… ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [May 3, 2009, 7:19pm UTC](https://community.cartalk.com/t/radiator-fan-will-not-stop/29966/4 "2009-05-03T19:19:51Z")
There’s another coolant temp relay located on the top center of the engine. I thought that was the one you replaced. Let’s hope that’s the culprit. Forget that. I was thinking coolant temp sensor. Tester ---
**Author:** ![bisstess](https://avatars.discourse-cdn.com/v4/letter/b/8dc957/32.png) [@bisstess](https://community.cartalk.com/u/bisstess)\ **Post date:** [May 3, 2009, 7:22pm UTC](https://community.cartalk.com/t/radiator-fan-will-not-stop/29966/5 "2009-05-03T19:22:42Z")
Is it located near the temperature sensor that is on the thermostat housing? I do not see a “relay” on the top center of the engine. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [May 3, 2009, 7:37pm UTC](https://community.cartalk.com/t/radiator-fan-will-not-stop/29966/6 "2009-05-03T19:37:36Z")
I went back and checked the circuit again. There’s also a cooling fan control module located behind the right side of the instrument panel next to the relay. That might be the problem. Tester ---
**Author:** ![bisstess](https://avatars.discourse-cdn.com/v4/letter/b/8dc957/32.png) [@bisstess](https://community.cartalk.com/u/bisstess)\ **Post date:** [May 5, 2009, 12:37pm UTC](https://community.cartalk.com/t/radiator-fan-will-not-stop/29966/7 "2009-05-05T12:37:27Z")
Tester, thank you for your help. I found the location of the 3 fan relays for speed control. They are located behind the battery on top of the wheel well. The high speed relay was hanging up. Problem solved