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Why would a 1989 Chevy Silverado 350 heater only put out luke warm air even after changing the thermostat and back flushing the heater core?
Wiki User
∙ 15y ago
I had the same problem. The answer to your problem is simple. You have an air pocket in your cooling system. Simple fix - take the radiator cap off of the radiator, turn the vehicle on and let it run for 1hr to remove the air from the system. Also, make sure your overflow container is atleast at the minimum level. Answer If your certain you have all of the air out of the cooling system the blend door inside the heater box may be stuck open.
Wiki User
∙ 15y ago
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How come your heater blows cold air in a 2000 silverado?
The heater might blow cold air in a 2000 Silverado because the thermostat is sticking and not changing from cold to heat. The thermostat is usually located in a hose that leads from the radiator to the motor.
Your truck does not produce heat its warm at first then cools down you already replaced the thermostat?
Try flushing heater core Try flushing heater core
Why no heat on 1990 silverado heater core I've changed control and thermostat.?
Have you flushed the heater core?
How do you change a heater core in a 1998 jimmy?
Before CHanging the Heater Core, have you tried flushing it? I have a 99' Jimmy and have to do this every year to get my heater to work.
Why does heater still not heat up on 2000 Chevy blazer after flushing and changing termasate?
Heater Airbound? Heater control cable not working? Heater core plugged?
Why is my s10 blazer not heating?
could be a bad thermostat try replacing it answer try flushing out your heater core also
Silverado heater blows cold air only?
possibly thermostat stuck in the open position?
Why wont the Heater on 2000 Chevrolet silverado get warm but not hot i have changed thermostat?
What temp. thermostat did you put in? Try a higher temp. one. or check to see if heater core is clogged
What would cause you to lose heat in your 1999 Chevy silverado if your thermostat and heater core are both good?
Your heater relay switch may be bad
Why won't my heater blow hot after a coolant flush and changing of the thermostat in a 2000 Taurus?
probably the heater core is clogged
2000 silverado heat wont work not thermostat not heater core not controls whats wrong?
try the bend door
What if your 2004 silverado temp gauge runs above normal in town and the heater blows cold but runs at normal temp on the freeway and the heater works fine What is the cause?
thermostat
