What sensor is it (LT1)?

[zraffz]

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.

http://img6.imageshack.us/img6/5139/1126111615.jpg

[LTb1ow]

Coolant sensor that should be on the driver side.

[sweetbmxrider]

For the gauge too. Might be a used head or something like that.

[zraffz]

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?

[sweetbmxrider]

Might just be some lead on it unless you have or someone had an aftermarket gauge?

[zraffz]

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.

[Fast92RS]

could be coolant fan switch

[sweetbmxrider]

They are controlled by the computer via the 2 wire coolant temp sensor in the water pump.

[Pampered-Z]

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?


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.

[sweetbmxrider]

Never knew about that, pretty neat.