Engine coolant fan not coming on?

JULIUSCEASAR

MEMBER
1997 DODGE CARAVAN
6 CYL
2WD
AUTOMATIC
123,000 MILES

Have a 1997 dodge caravan, the engine coolant fans are not coming on. Tried to swap fan relays, checked all fuses, fans work if you put battery voltage. Have no voltage to fans. Don't know if other relays or computer activates fans. Need wiring schematics. Also fans don't come on when a/c is turned on.

1 Reply

SQM

MECHANIC
6,383 POSTS

Hello,

It sounds like you have a wiring issue.
Possibly a short in the cooling fan harness.
Check to see if you are getting power to the fan harness. Be sure to look for any corrosion on the relay terminal.

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

Another possibility is faulty coolant temperature sensor. If the sensor is bad then it will not send signal to turn on the fan. I have attached the testing procedure for the temperature sensor.

You might find these articles helpful:

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

I have attached diagrams for your reference.

Please let me know of any questions.

Thank you.

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