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Old 11-27-2011, 08:02 PM   #1
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What sensor is it (LT1)?

Anybody able to tell me what this wire is? It's on the passenger side right between the back two cylinders. It's a green plug with one wire (that I believe was brown or purple).

It's in my 1994 A4 Z28. My 95 M6 and brother's 97 M6 don't have it.

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Old 11-27-2011, 08:04 PM   #2
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Coolant sensor that should be on the driver side.
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Old 11-27-2011, 08:07 PM   #3
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For the gauge too. Might be a used head or something like that.
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Old 11-27-2011, 08:08 PM   #4
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I have a coolant sensor on the other side though.... I can understand if it's a used head but why is it plugged in lol?
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Old 11-27-2011, 08:12 PM   #5
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Might just be some lead on it unless you have or someone had an aftermarket gauge?
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Old 11-27-2011, 08:15 PM   #6
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Might just be some lead on it unless you have or someone had an aftermarket gauge?
No aftermarket gauge in the car, maybe at one point it had one though.

I didn't bother tracing the wire either. I saw it and was like "what the hell is that" and my buddy looked at it and was clueless as well.
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Old 11-28-2011, 08:59 AM   #7
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could be coolant fan switch
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Old 11-28-2011, 10:50 AM   #8
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They are controlled by the computer via the 2 wire coolant temp sensor in the water pump.
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Old 11-30-2011, 05:25 PM   #9
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From the factory that port isn't used on F-bodies.

Not sure it the vettes or impala SS may have used the sensor on the passenger side?


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They are controlled by the computer via the 2 wire coolant temp sensor in the water pump.
Another option is that Hypertech sold a kit to bring the fans on early (185 degrees) You used a sensor in the passenger side head and it tied into the connects by the ECM, basically overriding the sensor in the water pump for the low speed fan, so 1 wire into the connector is used. Trace the wire, it probaly goes to the 12 pin connector near the ECM if that is a low temp fan switch.

Back in the early LT1 days these switches + thermostat swap was a cheap and easy mod that cost allot less then getting the ECM reprogrammed. I actually still use mine.
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Old 11-30-2011, 05:54 PM   #10
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Never knew about that, pretty neat.
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