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If you are saying the heater is blowing out cold air you need to change the heater core which is located inside the dash
it has a dead raccoon stuck in it
Sounds like a defective heater core
Get the air out of your heater core.
yes it will still work if you get cold air your heater core could be pluged or the coolant is low
Low coolant? Bad thermostat? Heater core plugged,restricted or airbound? Heater control cable or valve not working?
The a/c - heater controller is out...........
Your heater will blow cold air only.
THE CAUSE for this is that when your cold air is on the petrol is used to create air. and that is how cars create cold air
possible clogged or damaged heater core
I would change the thermostat first. If that dont work change water pump
I assume your car heater is blowing cold air, when the heater is on. It seems that, you have air on your coolant. that air pockets blocks the cooland to travel through your heater. it may be a sign of a bigger problem such as blown head gasket in the old cars, such acura legend