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1981 931 temp gauge and fans

 
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Rico  



Joined: 21 Aug 2023
Posts: 7
Location: Fort Lauderdale

PostPosted: Wed Jan 15, 2025 3:32 pm    Post subject: 1981 931 temp gauge and fans Reply with quote

Hello,
I tried searching for this information and didnt see anything related.
When the engine comes up to temperature the gauge goes crazy back and forth from cool to hot (bouncing).
Is there a remedy for this.

Also the drivers side fan comes on, however the passenger side does not.
Are they both supposed to come on simultaneously?
or is the passenger side fan used with the A/C only?
Thanks.
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924RACR  



Joined: 29 Jul 2001
Posts: 8880
Location: Royal Oak, MI, USA

PostPosted: Wed Jan 15, 2025 11:31 pm    Post subject: Reply with quote

Sounds like an electrical connection issue - not shocking, the single wire can get damaged, might be only holding on with one strand.

The temp sender is located at the back of the head, under a couple of coolant hoses... someone here probably has a nice pic of it... I'd start by inspecting that wire. If you touch it to ground, the gauge should go to max hot...

The sender itself is really basic and pretty bulletproof in my experience; I've never seen one fail, after decades, just bad wiring.

If you switch on the AC, both fans should come on. Check connections on the fans themselves, otherwise the next most likely problem is one of the two AC relays being dead (since they do power the rad fans on the AC cars).
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Rico  



Joined: 21 Aug 2023
Posts: 7
Location: Fort Lauderdale

PostPosted: Fri Jan 17, 2025 11:31 am    Post subject: Reply with quote

Thanks for your response 924RACR, I really appreciate it.
I will check the system further this weekend.
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