GmcSparky

P0117 and P0119. Tried new coolant sensor, fixed it for an afternoon, next day fan on high again, found someone had a cavalier that had a bad A/C pressure sensor that told the computer that the pressure was high causing the fan to turn on high. So, went to find they put the sensor by the compressor by the tire wheel well, (great place up in the north with salt, can’t leave a good thing alone and leave up above). While truck was running and fan on high I unplugged the sensor, nothing happened, plugged back in and the fan calmed down to a normal speed. Took back apart and installed some dielectric grease on the connector. So far a week later still good. GM connectors suck. Had problems with my Malibu brake light connectors by dash, before I sold it.