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Rad Fan Troubleshooting Help
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smoltz
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Joined: July 14, 2019
Posts: 2

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PostPosted: Thu Aug 15, 2019 9:59 pm    Post subject: Rad Fan Troubleshooting Help Reply with quote

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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1994Karuso
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Joined: November 08, 2018
Posts: 23
Location: PacNW
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PostPosted: Fri Aug 16, 2019 9:40 pm    Post subject: Re: Rad Fan Troubleshooting Help Reply with quote

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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