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1993 Pontiac Grand Prix Heater blows cold air

Tiny
TISH1098
  • MEMBER
  • 1993 PONTIAC GRAND PRIX
Heater problem
1993 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic 100k+ miles

This is my daughters car. When the heater is set on high heat the blower puts out cold air. This is even after the car has sit and ran for quite some time. The AC works perfectly. The car is not overheating. I am totally stumped and not sure what the problem could be. Can you please advise?
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Sunday, January 3rd, 2010 AT 8:51 AM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, does the heater work good on lower speeds? Do you live in extremely cold region? Does the engine reach normal operating temp? Under the hood, do the heater hoses get hot?

If no heat at all, possibilities, thermostat-- clogged heater core-- a directional air flow door under the dash isn't working properly.
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Sunday, January 3rd, 2010 AT 9:35 AM

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