If you used an aftermarket sebder I'd start there by changing to a GM part. Adding the cold front will help stabilize, and if your thermostats are original it would be a good idea to change them plus the coolant.
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If you used an aftermarket sebder I'd start there by changing to a GM part. Adding the cold front will help stabilize, and if your thermostats are original it would be a good idea to change them plus the coolant.
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A scan tool or a programmer could be used to verify what the computer is seeing for temp. Sounds like a sender problem, but if a new one doesn't help, I'd look deeper with a scan tool to help narrow it down. Also, check the electrical connector and wiring for damage - since it was recently unplugged/plugged-in.
Jim
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