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Pontiac troubleshooting heat not working water not going through heater core

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  • Cars & Trucks Master
  • 3,103 Answers

Heat control valve off or water pump out..

Posted on Dec 26, 2013


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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

blueextc3221
  • 15935 Answers

SOURCE: no hot air from heater, blower runs fine

The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

Since you state the 2 things you ruled out, that leaves only the water pump. Is the car running hot? The thermostat may be sticking as well... but im leaning toward the pump.

Posted on Jan 21, 2009

johnsmith992
  • 37 Answers

SOURCE: Replace heater core in Pontiac Grand Am GT 3.4l

ram a sharp chissel or pointed head centre punch through the core and prise it out .,than tap the new one in place ,,,there u go bobs ure uncle

Posted on Jan 29, 2009

  • 451 Answers

SOURCE: How do replace heater core in 2002 Pontiac Gran Prix

i do believe you have to take the passengers side dash apart behind the glove compartment. go to autozone and get a manual or go to the library and check the chiltons manual. this is not an easy job. how bad is the leak? if its not bad these heater cores are made of all aluminum. i would buy a bottle of that radiator additive and see if that takes care of the problem first. it only cost about 5 bucks a bottle and it may permanantly fix your problem.

Posted on Aug 13, 2009

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Have a heat problem...I had no heat ,so I flushed out my heater core as only one hose was hot.After I flushed it out I had heat.I then turned off my car.When I went out again I had no heat again.Both hoses...


Do you have a heater control valve.mabpest_16.jpg
.the damper door may be closed on it not allowing hot water to the heater core.
You can go to my tips "heat troubleshooting" for more info.

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I want to flush the heater core


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