1988 Plymouth Horizon installed new thermostat, engine now

Tiny
TIDENERGY
  • MEMBER
  • 1988 PLYMOUTH HORIZON
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
Two years ago, the bottom clamp failed and the engine coolant emptied out. Had it repaired with new thermostat. Let gas get too low in tank recently, had the fuel filter and system cleaned out. From then on found engine gauge redlines from cold start after 3-4 miles driving. Had thermostat again changed, but still does it. Each time it redlined, I shut the engine off and the top rad hose is cold. After 1-2 minutes, I restart it and the temperature gauge drops to normal range, where I can continue driving with no problem. The mechanic now thinks it may be the head gasket. I'm thinking it is an air pocket in the coolant system behind the thermostat. He did try bleeding off the ria from the rad, but didn't open the Allen bleed plug to drain the air off if that is the problem. Any ideas appreciated.
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Saturday, March 20th, 2010 AT 9:17 PM

5 Replies

Tiny
LEGITIMATE007
  • EXPERT
Have it pressure tested, that will determine if there is a bad gasket. How good is the water pump?
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Saturday, March 20th, 2010 AT 10:05 PM
Tiny
TIDENERGY
  • MEMBER
Will suggest checking the cylinder pressure Monday morning. Haven't noticed a problem with the water pump, but will suggest that it be looked at too.
Thank you.
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Saturday, March 20th, 2010 AT 11:44 PM
Tiny
LEGITIMATE007
  • EXPERT
You are quite welcome, keep me posted
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Sunday, March 21st, 2010 AT 8:39 AM
Tiny
TIDENERGY
  • MEMBER
Looks like the head gasket. It is losing coolant with white exhaust. Chemical test done also.
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Wednesday, March 24th, 2010 AT 12:42 PM
Tiny
LEGITIMATE007
  • EXPERT
There you go, such a pricey job for a part that costs less than twenty bucks
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Wednesday, March 24th, 2010 AT 2:06 PM

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