cooling fan wont come on

1998 FORD CROWN VICTORIA
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BRAD31
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  • 3 POSTS

my cooling fan quit working.i replaced the sensor on the intake but i guess thats not what controls the cooling fan from coming on.it does work however if i keep the a/c on max a/c.its getting cold out and i need to beable to turn my a/c off.
Nov 7, 2009 at 7:17 PM
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BMRFIXIT
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  • 19,053 POSTS
With AC on fan working
with AC off is the engine overheating
fan comes on only when needed
if engine not overheating assume all function normal
check for codes
check relays and fuses
check engine coolant temperature sender and wiring
located on top front of engine near #1 injector

Here are a couple guides that will help test the system

https://www.2carpros.com/articles/how-to-check-wiring

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

Wiring diagram is attached below
Image (Click to enlarge)
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Nov 8, 2009 at 6:30 AM
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CHASCHEE
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my cooling fan for radiator runs constantly. It drained the battery. the sensor reads 1280 ohms, and decreased to 900 while running for 5 minutes. The reference voltage at plug was 10.65 volts. could it be the ecm?
Apr 26, 2019 at 6:50 PM (Merged)
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MERLIN2021
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reference voltage too high, check harness by unplugging from the pcm. for continuity test. if harness is okay have it scanned for codes. b or u codes wont turn on the light.
Apr 26, 2019 at 6:50 PM (Merged)
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CHASCHEE
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Thank you merlin2021
Apr 26, 2019 at 6:50 PM (Merged)
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MERLIN2021
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you are welcome, keep me in the loop!
Apr 26, 2019 at 6:50 PM (Merged)
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RENEE L
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Here is a link to an article that features written instructions and pictures explaining how to do the scan yourself, also I have included a link to our YouTube channel with a how to video on code scanning. Most scanners are inexpensive to purchase, you can purchase one from Amazon.com. Once you have the codes please get back to to us so we can further assist you. Thank you for visiting 2CarPros.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://youtu.be/YV3TRZwer8k
Apr 26, 2019 at 6:50 PM (Merged)