Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I would take the sender wire off. With a warmed engine running, the gauge should read under cold on the lower stop.
Can you try this please?
If the gauge reads anything above cold, you have a partial to ground on the sender wire or the cluster voltage regulator is faulty.
That is odd, you have done all that work, and it still reads high.
Is the temp sender near the coolant temp sensor for the Engine ECM?
What temperature does the ECM read in data?
The voltage regulator would be in the cluster.
Is the sender definitely the correct one for this engine?
Is this a thermostat issue, rather than a gauge issue?
I've always been suspect of some thermostat brands.
Or a partly blocked radiator?
Ok, I'll be here for you.
Have you had any progress with your engine problem?
I hope my advice has been of assistance to you.
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Ok, hope all is fine now.