Intermittent temperature light

[Geesie]

Have a 1984 Regal, 231, all stock parts. I recently (within the last month) got it running right for the first time. I have noticed that every so often, the temperature light will fade on, then go back off. It doesn't come on bright, it's like there's a rheostat on it and it goes from off to about halfway bright slowly, then fades back out. It doesn't do this most of the time and it usually only does it for the first couple miles of a drive when it does happen.

Since it's so intermittent, I can't reproduce it in the driveway to look for a problem. The radiator doesn't leak and the water pump is only a couple years old. Ideas?

 

[pontiacgp]

I'd check the connection at the sending unit and make sure it's clean and secure....

 

[JESSE]

temp light

if i remember right all gm warning light's (oil pressure and coolant) use a grounding circuit. if i got this right this means that a small amount of voltage is sent to the sender, the sensor is the ground. that means that the sensor is open when cold as the temp rises the sensor grounds out causing the light to come on ...your problem could be a bad sensor, thats the first thing i would look at!!!! you can check system by turning on ignition and disconnecting sensor grounding out wire the light should come on bright. also look for a skined out or rubbing wire. good luck :wink: