I have already replaced the thermostat 3 times, removed the radiator and had it professionally cleaned and serviced, truck has correct amount of water/antifreeze. usually when a vehicle over heats you can turn on the heat in the cab and take some heat off the engine, this time all I get is cool to warm air no heat. Does this indicate water pump or heater core, I have had no water under the dash or in the floorboard.
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
SOURCE: have 1990 voyager 3.3 that the engine wont heat
are you using a 190 degree thermostat..do you have a faulty sending unit,also check the heater control valve,make sure you are putting the thermostat in correctly,dont mean to make you sound bad,some of these thermostats are funny
SOURCE: 2006 chevy impala overheating. Cools when
Hi,
Am trying to understand the problem, but it really needs some details, like when the car stops( engine running ) the temperature cools down?
Give us more!
SOURCE: 2006 CHEVY COBALT OVERHEATING HAS NEW RADIATOR WATER PUMP AND THERMOSTAT
That is normal, it will not get hot without the thermostat. The water cools in the radiator and falls to the bottom and the bottom hose is cold. This is what cools the engine and stops it from overheating.
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