Add coolant if it's low, change the thermostat if it's bad, and/or check for a restriction in the cooling system such as the heater core.
can you please clarify what you mean, do you mean that the front heater blows cold but the rear blows hot or do you mean that when the heating is on cold it blows hot? many thanks paul
I have changed heater core,water pump,thermostat, the fon works well but only blows cold air plus i have flushed the system.
Its either a bad heater core or a clogged one. They are very expensive.
AnswerDepends whats broken ie. blows cold, no blower at all ???????no blower at all
Get the air out of your heater core.
heater hoses might have been disconected
Maybe thermostat is stuck open With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!
ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?
The most common reason a automobile heater blows cold air is the water level is low. Check the water level and fill to the appropriate level.
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
you must have low coolant or a bad heater core
we changed radaitor & thermastate , now heater blows cold air