My heater blows cold air. i replace the heater core and the thermostat and all fuses are good and it still blow cold air. both hoses comeing of the heater core are hot when running. i drive a 1994 chevy 1500
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If the heater is blowing cold air and the car is overheating, it is likely that the problem is related to the engine cooling system as well. The following are some issues that may be causing the heater to blow cold air:
Low coolant levels
A plugged/clogged heater core
A faulty thermostat (thermostat that is stuck)
Broken blower and/or blower motor
Heater core bypass hoses that have leaks
Heater core bypass hoses that are worn
If your car is overheating and/or your heater is not working, it should be inspected and diagnosed as soon as possible.
SOUNDS LIKE YOU HAVE A HEATER CORE THAT IS ALIITLE CLOGGED UP TAKE THE HEATER HOSE OFF TO HEATER CORE AND FLUSH IT OUT WITH A WATER HOSE.THE OTHER REASON IS YOU ARE LOSING VACUUM TO YOUR BLEND DOOR VACUUM SOLENOID.ARE IT IS BAD. THATS THE ONLY TWO THINGS IF YOU HAVE GOOD FLOW
squeeze the hoses to get any air bubbles out and refill coolant as necesary. are you sure you put thermostat in the right way? may be backwards. also may be your sensor.
You could have a blocked heater core. Check for two heater hoses
running into the firewall in the back of your engine. They should be
together and about 5/8" in diameter. If one is hot and the other is
cooler then your heater core is blocked. Unhook both hoses and use a
garden hose to back flush. Be sure to catch the coolant and dispose of
it properly.
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