Question about 2000 Chevrolet Silverado 1500
If your engine temperature gauge reads normal, then the heater control (temperature setting) is probably at fault. If the temp gauge remains on COLD, then the thermostat is probably stuck open and needs to be replaced. If the temp is normal do the following:
With the truck running (outside, of course), go to the passenger side of the truck and remove the panel that is just under the glove box. Inside that area is the heater core and the controls to operate the hot/cold vents. With a flashlight in hand look in that area as someone moves the temp lever or control from hot to cold. You should see movement of the cable to the heater core. If nothing is noted, check for loose wires, disconnected cable and any vacuum leaks. You may have to replace the heater control unit. On a vehicle of this age, your best bet would be a salvage yard or EBAY...
Good Luck and I hope this helps...
Posted on Nov 25, 2013
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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: blowing cold air
I had the same problem that I just fix by flushing the heater core out with a hose. take the two hoses off the fire wall and put the water to it and let flush. my heater is putting out 150 dg. F of hot air. I'm so excited! i will stay warm now.
Posted on Feb 27, 2009
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