Question about 1992 Pontiac Grand Am

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Filled radiator with antifreeze and it overheated,also cold air seems to be comming out of the heater vents

Previously we replaced the thermostate and had to replace radiator cap and the water pump,been having a little trouble with the fan as to it hasnt been overheating until we were getting the car ready for winter,When it started overheating it never smelled hot but noticed that when checking the heater it was nothing but cold air.

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  • Pontiac Master
  • 14,333 Answers

2 things,radiator partially clogged,and/or bad heater core.Fan clutch could also be bad.

Posted on Oct 27, 2012

  • jewelz4588
    jewelz4588 Oct 27, 2012

    In the beginning of this spring it was over heating ,replaced thermostat,radiator cap twice, and then we had to replace water pump,my husband noticed the fan wasnt turning on as it should so he did something so we hook it up to the battery when we use it,hasnt over heated once all summer until he fillled it up with antifreeze,heater is blowing out air colder than the a/c, also when it started over heating i noticed that i couldnt smell anything like when cars over heat

  • Daniel Mc Entee
    Daniel Mc Entee Dec 07, 2013

    when you have trouble with heating .first thing to do is. put a radiator flush in your radiator run it for about 20 miles.then drain it.the easy way to do that is remove the hose from your water pump.then refit fill with a 50/50 mix of anti freeze. leave off your expansion bottle cap the now.turn on your engine .put your heating on full.this is how you bleed the air out of both your radiator and your heater core .with the water getting hot refit your cap.


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Posted on Jan 02, 2017

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i believe the heater core broke or got crak chech the thermostat again

Posted on Apr 07, 2009

  • 3740 Answers

SOURCE: car overheating, blows cold air out vents, changed

A couple of things to check because as you describe your symptoms you actually have 2 problems

1. No heat from vents.

Sounds like the heater water flow valve cable is kinked disconnected or the valve itself is stuck You will need to follow your heater core water supply lines to find the valve usually to the right of the center console in the ducting area / large plastic housing for heater and AC internal coils. If the valve works then there is a possibility that the heater core water supply lines have been bypassed on the engine side of the firewall with a coupling due to a leaking heater core. And l;astly the heater core could just be clogged. (quite rare!!)

As for the overheating engine after all of the work you have done.. Perform this simple test.

1. remove radiator cap
2. have someone else start the car
3. watch for water coming out of the open radiator cap area DURING start...
4. have person in the car rev engine gently 2 or 3 times. No need to exceed 2000 RPM. If water rapidly flows out of the radiator during engine revs.. you have some major engine issues.
If it passes all of these checks then the only thing left is improper hose connections on the engine side of the firewall and or a hydraulic water lock in the block that should clear itself by starting and stopping the engine many times with the radiator cap off.

Posted on Jan 27, 2010

  • 148 Answers

SOURCE: my antifreeze is leaking out of my radiator .....HELP : (

take it to repair shop where they can pressurize the cooling system, they should be able to see where the coolant is leaking, Could be an intake leaking, Common problem

Posted on Feb 25, 2010

  • 750 Answers

SOURCE: Still 2000 sunfire 2.2 overheating

make sure that you don't have a intake leak,that will cause it to over heat quickly when accelerating,if you don't check to see if you have any air in the system as many times you've had your system open you probably do,bleed it and it should correct the problem.


Posted on Oct 20, 2010

  • 1050 Answers

SOURCE: My '99 Pontiac Grand Am

I would replace the rad, you've done everything else.

Posted on Jun 02, 2011

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