Question about Cars & Trucks
If your coolant levels arent drastically low then it could be your getting to much air in the system from a bad head gasket. If those are your symptoms then I have to believe that you are losing some coolant at least.
Posted on Oct 31, 2012
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Posted on Jan 02, 2017
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.
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Drive safe and be warm.
Posted on Feb 02, 2009
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
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