Cooling fan wont come on

BRAD31

MEMBER
1998 FORD CROWN VICTORIA

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.

6 Replies

BMRFIXIT

MECHANIC
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

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Sunday, November 8th, 2009 AT 6:30 AM

CHASCHEE

MEMBER
2 POSTS
1999 FORD CROWN VICTORIA
V8
2WD
AUTOMATIC
128 MILES

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?

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Friday, April 26th, 2019 AT 6:50 PM (Merged)

MERLIN2021

MECHANIC
17,250 POSTS

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.

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Friday, April 26th, 2019 AT 6:50 PM (Merged)

CHASCHEE