Mechanics

ENGINE TEMP NOT CONSTANT

1992 Pontiac Transport • 192,000 miles

Replaced thermostat, coolant sensor, radiator fan and fan harness and fan relay, doesn't seem as if thermostat is opening as it should. Thought day old thermostat was bad but 2nd new one doing the same thing
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Dmnovak
August 12, 2012.



What do you mean by not constant?

Do you have coolant losses issues?

KHLow2008
Aug 12, 2012.
No coolant loss, thermostat doesn't open all the time upper hose hard as a rock when it doesn't open.

Tiny
Dmnovak
Aug 12, 2012.
How badly did it overheat and how many times?

Roy

ASEMaster6371
Aug 12, 2012.
You should check to see if the head gasket is leaking. Get a block test kit

Djcl
Aug 12, 2012.
Caught the overheating(once)in time head gaskets replaced 10000 miles ago

Tiny
Dmnovak
Aug 12, 2012.
Is the replacement thermostat OEM? I believe you should be looking at it one more time.

KHLow2008
Aug 13, 2012.
Why OEM
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Tiny
Dmnovak
Aug 13, 2012.
Quality of thermostat matters.

KHLow2008
Aug 13, 2012.
Ok thx I will get an OEM

Tiny
Dmnovak
Aug 13, 2012.
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.

M_H_RITZEL
Aug 17, 2012.

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