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Engine temp not constant

Tiny
DMNOVAK
  • MEMBER
  • 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 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
What do you mean by not constant?

Do you have coolant losses issues?
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Sunday, August 12th, 2012 AT 9:14 PM
Tiny
DMNOVAK
  • MEMBER
  • 6 POSTS
No coolant loss, thermostat doesn't open all the time upper hose hard as a rock when it doesn't open.
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Sunday, August 12th, 2012 AT 10:37 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
How badly did it overheat and how many times?

Roy
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Sunday, August 12th, 2012 AT 10:45 PM
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
You should check to see if the head gasket is leaking. Get a block test kit
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Sunday, August 12th, 2012 AT 10:48 PM
Tiny
DMNOVAK
  • MEMBER
  • 6 POSTS
Caught the overheating(once)in time head gaskets replaced 10000 miles ago
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Sunday, August 12th, 2012 AT 11:06 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Is the replacement thermostat OEM? I believe you should be looking at it one more time.
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Monday, August 13th, 2012 AT 1:14 PM
Tiny
DMNOVAK
  • MEMBER
  • 6 POSTS
Why OEM
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Monday, August 13th, 2012 AT 2:01 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Quality of thermostat matters.
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Monday, August 13th, 2012 AT 4:31 PM
Tiny
DMNOVAK
  • MEMBER
  • 6 POSTS
Ok thx I will get an OEM
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Monday, August 13th, 2012 AT 5:38 PM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 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.
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Friday, August 17th, 2012 AT 2:36 PM

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