Electric fan on with run position. Thermo control not working

[L.O. Guvna]

At cold start, fan would not come on, but would when it got to 195 or whatever I had it set to. I assume this control has failed, or someone adjusted the knob when I wasnt looking.

my probe sticks thru the radiator fins.

thanks
LOG

[lfmTR4]

Guv, from what you wrote it sounds like it’s working. It should only come on after hitting the high temp you have set, not on a “cold start”.

[L.O. Guvna]

Lou - I forgot to follow up on this. It only happened that day, and went away. But, I did find something interesting. My controller is on the side of the radiator. And its a simple rheostat - open design. I've spray washed my engine bay many times, but this last time, while fiddling with my failing fuel pump and fuse box, I hear this sizzling sound. ? I get closer to that rheostat, and with my engine in run position, that thermo controller is on, waiting for temp to get up, but now its sizzling, I think, because its wet. So, I turn the car off. Sizzling stops. I might be damaging my controller when I spray my engine bay.

thanks for the note, and the feedback on the other threads. hope to see you soon.

LOG
#guvnal

[lfmTR4]

Yeah, if its open don't get it wet - pots don't like that. Put plastic around it and keep it dry if you wash the engine bay. Depending on where it located, it might be a bad idea to put a shield over it to deflect water in case you get caught driving through a big storm.

[L.O. Guvna]

After your reply, and thinking on this, that shorting - sizzling noise, probably happened at the car wash and never heard it. I only heard it this time cause I was at home, using my garden hose. I wonder if there is a version of this controller that is marine grade - so to speak. Or, who says that controller needs to be by the radiator - the wiring can be anywhere, maybe up by the fuse box. Or in the glovebox...rambling now.

sorry
G