Cooling Fan Problem- HIgh speed doesn't work with a/c on

[Twista]

Where would you guys look on a 94-95 GT when the high speed fan doesn't work when the a/c is on. When i unplug the ECT sensor then fan runs in high speed. When i plug it back in the fan kicks back down to low speed.

Car has slightly runs hot when the A/C is on because fan is running in low mode instead of high speed.
ECT sensor is brand new.

Thanks :wave:

 

[CC'S95GT]

IDK. the fan shouldn't be on low when the A/C is on. anytime.
Something is wierd. maybe in the CCRM.

 

[Twista]

I did the key on engine off/on test and got code 118. Which is odd because i do have warm start problems where black smoke comes out and barely runs. So now im going to focus on this code i guess. Unless i got a bad ECT sensor the one i have now is brand new. I read the wiring could be toasted @ the connector and to cut it off and replace.


Which is:
Potential Symptoms Symptoms of a P0118 could include:
Very poor fuel economy
A no start condition Vehicle may start, but run very poorly,
blowing black smoke,
running very rough and misfiring Illumination of MIL

Causes A code P0118 may mean that one or more of the following has happened: A bad connection at the sensor
An open in the ground circuit between the ECT sensor and the PCM
A short in the voltage feed between the sensor and the PCM
A bad PCM (less likely)
A bad temperature sensor (shorted internally)