Question about 1999 Chevrolet Silverado 1500

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I have a Chevy 2001 1500, I changed the thermostat and still have heat at first then it gets cool. Any ideas ?

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Sounds like your heater matrix could be blocked try flushing out but when you refill system undo one hose on your matrix at the rear of engine compartment to bleed air out of matrix this should help if not it may be you need a new water pump

Posted on Jan 02, 2014

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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

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