Question about 1993 GMC Safari

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1998 Dodge Durango no heat when using heater.

Problem: Heater blows cold air.
Changed the water pump due to bad bearing on the main seal.
At the same time changed the thermostat because the vehicle has 162k and figured it should be replaced. 195 degree thermostat.
Checked coolant flow through the radiator, upper and lower radiator hoses, and hoses to and from the heater core.
Inlet hoses were warm during vehicle operation and return hoses were relatively cool.
Coolant seems to be running freely and the analog temperature gauge stays at around 145 degrees during operation in the wintertime. Outside temp has been around 30 degrees farenheit.

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  • 4 more comments 
  • eric_fuller Jan 09, 2009

    kdc744 asked if I have rear heat, the anwer is no.

  • kevin carpenter May 11, 2010

    do you rear heat ?

  • Anonymous Mar 13, 2014

    took my 2006 buick lucerne in for oil change and barrings replaced on vehicle and air filters replaced as well and the inside indicator that gives outside temperature is stuck on 30 degrees

  • Anonymous Mar 17, 2014

    no heat,. temp gauge up and ,down, replaced therm. 2 times, all hoses, water pump, radiator, can I bypass heatercore blockage

  • Anonymous Mar 19, 2014

    2001 4.7 l. V8. It is still overheating.

  • Anonymous Mar 19, 2014

    sounds are near heater core, no significant loss of coolant



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Posted on Jan 08, 2009

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I would assume that you might have a bad head gaskit.

Posted on Jan 08, 2009


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1 Answer

I have a 98' Pontiac Grand Am GT. Car over heats in less than 2 miles and ?the heater blows out cold air, how can I fix this

Hi Josh-
I assume that you have the proper mixture and levels of coolant in your radiator and plastic overflow tank. Open your radiator cap (when the engine is cold) to make sure this is the case. If not, fill as directed by your owners manual.
If the cooling system's thermostat is bad, the hot coolant coming from your engine can not circulate to the radiator in front of the car to dissipate this heat and return to the engine colder.
The odd part you describe is that cold air blows out of the heater. If your car is overheating, you should have above average heat, since your car is running hot.
A bad water pump may also prevent coolant from circulating correctly. Usually, a bad pump will show up as a puddle of coolant underneath your car-since the bearing or seals usually wear out on the pump. However, I've seen where the internal blades or impellers of the pump have worn out due to deposits in the coolant due to infrequent replacement.
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