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Anonymous
Anonymous Posted on Nov 30, 2009
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1995 GMC suburban temp guage pegs high, but heater

1995 GMC suburban 350 1500 4wd temp gauge pegs high, but heater blows cold. Sometimes the temp returns to normal, and heater blows hot.

Thermostat? Blockage?

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  • Contributor 11 Answers
  • Posted on Nov 30, 2009
Anonymous
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Joined: Nov 30, 2009
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Sounds like there may be an air pocket in the system.
Try 'burping' the system. If this still doesn't fix the problem, check the temperature of the heater core hoses (in and out) The inlet should be fairly cool, the other should be piping hot. If they're both cold; the heater core has an internal blockage.

Next, replace the thermostat with a winter (180-195 F) derivative.
Bleed the system accordingly, and keep me posted!

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