ENGINE TEMP NOT CONSTANT

  • Tiny
  • dmnovak
  • 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

Sunday, August 12th, 2012 AT 9:05 PM

10 Answers

  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

What do you mean by not constant?

Do you have coolant losses issues?

Was this
answer
helpful?
Yes
No
Sunday, August 12th, 2012 AT 9:14 PM
  • Tiny
  • dmnovak
  • Member

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

Was this
answer
helpful?
Yes
No
Sunday, August 12th, 2012 AT 10:37 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

How badly did it overheat and how many times?

Roy

Was this
answer
helpful?
Yes
No
Sunday, August 12th, 2012 AT 10:45 PM
  • Tiny
  • djcl
  • Expert
  • 786 posts

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

Was this
answer
helpful?
Yes
No
Sunday, August 12th, 2012 AT 10:48 PM
  • Tiny
  • dmnovak
  • Member

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

Was this
answer
helpful?
Yes
No
Sunday, August 12th, 2012 AT 11:06 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

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

Was this
answer
helpful?
Yes
No
Monday, August 13th, 2012 AT 1:14 PM
  • Tiny
  • dmnovak
  • Member

Why OEM

Was this
answer
helpful?
Yes
No
Monday, August 13th, 2012 AT 2:01 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

Quality of thermostat matters.

Was this
answer
helpful?
Yes
No
Monday, August 13th, 2012 AT 4:31 PM
  • Tiny
  • dmnovak
  • Member

Ok thx I will get an OEM

Was this
answer
helpful?
Yes
No
Monday, August 13th, 2012 AT 5:38 PM
  • Tiny
  • M_H_RITZEL
  • Expert
  • 2,765 posts

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.

Was this
answer
helpful?
Yes
No
Friday, August 17th, 2012 AT 2:36 PM

Please login or register to post a reply.

Similar Questions