1992 Pontiac Transport Repair Question
Engine temp not constant
What do you mean by not constant?
Do you have coolant losses issues?
No coolant loss,thermostat doesn't open all the time upper hose hard as a rock when it doesn't open.
how badly did it overheat and how many times??
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You should check to see if the head gasket is leaking. Get a block test kit
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Caught the overheating(once)in time head gaskets replaced 10000 miles ago
Is the replacement thermostat OEM? I believe you should be looking at it one more time.
Quality of thermostat matters.
Ok thx I will get an OEM
even new thermastats can be bad right out of the box. Would get a OEM like KILlow says. It may also cause the temp sending unit to mess up. check any wires. After replacing the thermastat check the guage if it still does it the sending unit could be going bad.
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