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How do I replace a heating core in a 1992 Chevrolet Silverado 2500 Pickup Truck. It is blowing plenty of air, just no hot air

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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Anonymous

  • 360 Answers

SOURCE: No Heat and Overheating in 1999 Chevy Silverado

After replacing the thermostat, you must bleed the air from the cooling system.

To bleed air from the 2.2L and 2.5L engines, remove the plug or sensor on the top of the thermostat housing. Fill the radiator with coolant until the coolant comes out the hole. Since the plug is made out of steel and the thermostat housing is aluminum, it is a good idea to apply an anti-seizing compound or Teflon® tape on the plug threads prior to installation. Install the plug and continue to fill the radiator. This will vent all trapped air from the engine.

Any trapped air in the heating system will have to be displaced by coolant. Once the cooling system is filled, with the radiator cap off, turn of the heater at it's highest setting. Start the engine and allow it to reach operating temp. You should see a drop in the coolant level as the air in the heating system is displaced by coolant. Add coolant to the proper level and replace the radiator cap.

Keep a close eye on the coolant level for at least the next couple of weeks. The cooling system is a "closed" system. Any significant decrease in coolant level indicates a problem.

If you have any questions, let me know.

Please take the time to rate this solution.

Drive safe and be warm.

clarkco

Posted on Feb 02, 2009

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Anonymous

  • 3 Answers

SOURCE: NO Heat in 1999 CHevy SIlverado

flush the heater out with a hose.   the fastest and cheapest.   if that dosen't work then replace the Air blend actuator motor.  $59.99 at Auto Zone  part    # 604-101

Posted on Feb 27, 2009

dnewcombe1

Dana Newcombe

  • 1564 Answers

SOURCE: the air conditioning on my 2004 Chevrolet

After checking the fuses and the relay, I would suggest that you pick up a charging kit for about 25-30 bucks at your nearest dept. store or auto parts store.

Posted on Sep 07, 2009

Mike G

  • 98 Answers

SOURCE: BLOWS HOT AIR

compressor bad or leaked out refridgerant

Posted on Mar 29, 2010

  • 163 Answers

SOURCE: Driver side air conditioning blows hot air while

It sounds like you have a blend door issue. You need to get in your dash to fix this.

Posted on Aug 10, 2010

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