On my 2002 Saturn SC2, my temperature gauge will sometimes work and sometimes not. By not working, I mean it will stay on the cold reading. If I started my drive without it working it will continue to not work, it I started my drive with it working it will continue to work.
I took the car to the shop. My coolant fan works fine, pressure test reads normal (no leaks), car does not overheat. He did say my sensor is bad and I replaced that as well as the thermostat because why not. Temp sensor working fine, thermostat working fine, gauge working only sometimes. Mechanic said I have a couple options. Either something wrong with wiring which he said is labor intensive, or I can replace instrument cluster which is expensive. He did say I have a third option which would be to buy an aftermarket temp gauge.
My question is, with the temp gauge working sometimes, would a aftermarket temp gauge work? I realize none of you are actually looking at my car, I'm simply asking a possibility question. Could installing an aftermarket temp gauge potentially solve this problem given how it works sometimes which seemingly to me suggest a wire?