Fox Body Engine Water Temp

[Xkuzme1]

Question guys. New to me Cobra that used a 93 Fox Body donor. It’s got the speed hut gauges. Either My gauge seems to read artificially high, or my car is running hot. The gauge regularly see 120-140 degrees Celsius. Generally speaking it is 120-130.

Any ideas on where to start?

Today I’m going to let it warm up and take a temp gun and shoot a few areas to see if it is gauge issue or if it really is a heat issue. Seems to me that if it had got that hot, I’d have some obvious issues.

Are there any known “gotchas” with the cooling system that I should look for?

Thanks,

X

[Garage Guy]

140 c would be like 284 F I am pretty sure that would smoke the head gaskets if you were really seeing that kind of temp.

Richard

[seagull81]

New problem? First start? What did your heat gun show at the thermostat?

[Dagwoods]

What is the starting temp of the gauge? If it's higher than ambient you may want to check the water temp sender. I ran into an issue with "overheating" temps being reported as well.

My manifold has two sensors, one for the Holly sniper and one for the gauge. I got them mixed up and while my temp gauge was not even registering 70f, my sniper was showing it jumping to 220f and still climbing higher if I would have ran it for longer. Swapped sensors and they both are now reading fine. My clue was that the sniper was showing 150f as soon as I started it. Different sensors have different resistance, which was causing my issues.

[Xkuzme1]

Ok, went on a long drive. Temperature gauge reads about 25-30 high. I went on a nice long drive, and shot the in/out radiator hose and temps were right where I’d like to see them. I ordered a new sending unit. Hopefully that fixes the problem.

Thanks for your help and ideas.

x