ENGINE TEMP NOT CONSTANT

1992 Pontiac Transport

Tiny

dmnovak

August, 12, 2012 AT 9:05 PM

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

FOUND 173 RELATED QUESTIONS

Grand Wiring Problem

31 ANSWERS
14 IMAGES

10 Answers

Tiny

KHLow2008

August, 12, 2012 AT 9:14 PM

What do you mean by not constant?

Do you have coolant losses issues?

Tiny

dmnovak

August, 12, 2012 AT 10:37 PM

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

Tiny

ASEMaster6371

August, 12, 2012 AT 10:45 PM

How badly did it overheat and how many times?

Roy

Tiny

djcl

August, 12, 2012 AT 10:48 PM

You should check to see if the head gasket is leaking. Get a block test kit

Tiny

dmnovak

August, 12, 2012 AT 11:06 PM

Caught the overheating(once)in time head gaskets replaced 10000 miles ago

Tiny

KHLow2008

August, 13, 2012 AT 1:14 PM

Is the replacement thermostat OEM? I believe you should be looking at it one more time.

Tiny

dmnovak

August, 13, 2012 AT 2:01 PM

Why OEM

Tiny

KHLow2008

August, 13, 2012 AT 4:31 PM

Quality of thermostat matters.

Tiny

dmnovak

August, 13, 2012 AT 5:38 PM

Ok thx I will get an OEM

Tiny

M_H_RITZEL

August, 17, 2012 AT 2:36 PM

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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