Heater blows cold air, even after replacing thermostat and checking antifreeze, help?
After the engine has warmed to normal operating temperature, feel both heater hoses. If both are hot, the coolant is circulating through the heater core. Then the problem is probably the temperature blend door in the heater case. It is probably vacuum controlled. You will have to check for a vacuum signal to the blend door actuator-probably a little metal canister with a lever connected to the blend door.
SOURCE: Heater problems
Did you bleed the air oout of the cooling system - Their is a bleeding next to the therostat housing.
1 - When the vehicle is cold remove the rad(tank) cap and top up the level if needed
2 - start the vehicle with the rad cap off and leave the car run until you can see that the therostat has openned(look in tank/rad) to see fuild flow then open the bleeder slowly to let any air out of the cooling system. Once you have coolant flowing out of the bleeder close the bleeder and install the rad/tank cap.
NOTE - Be careful with the engine running and hot Coolant.
You make need to bleeding system 2-3 time to get all the all out. Once all the air is out of the system you problem should be solved. If air returns to the coolant system have the system checked for possible head gasket leaking air into the coolant system
SOURCE: car only blows cold air
Check temperature heath controltemperature heather controlNTREPID Temperature/Heater Control 2000
SOURCE: heater blowing cold air
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.
SOURCE: The heater is blowing cold but the engine temperature reads high
Hi
I would first check to see if both heater hoses are hot to the heater.
if 1 is hot and 1 is cold the heater control valve is closed or the heater core is plugged.
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