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  View original topic: Rad Fan Troubleshooting Help
smoltz Thu Aug 15, 2019 9:59 pm

I've read a little about how this setup works, but looking for advice as to what I should be checking for my specific symptoms...

That is, the fans (I believe both, but need to double check) are not shutting off, ever. I disconnected the battery, let the vehicle cool down for 6 hours, although it is 110F here) and reconnected battery, fans immediately turned on as soon as power as reconnected.

Thoughts? Vehicle is a 91 T4 AAB if it matters.

1994Karuso Fri Aug 16, 2019 9:40 pm

Pull off the temp sensor wiring harness from the passenger side of the radiator. If the fans stay off then the sensor is shorted internally.

smoltz wrote: I've read a little about how this setup works, but looking for advice as to what I should be checking for my specific symptoms...

That is, the fans (I believe both, but need to double check) are not shutting off, ever. I disconnected the battery, let the vehicle cool down for 6 hours, although it is 110F here) and reconnected battery, fans immediately turned on as soon as power as reconnected.

Thoughts? Vehicle is a 91 T4 AAB if it matters.



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