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.
AnswerDepends whats broken ie. blows cold, no blower at all ???????no blower at all
Its either a bad heater core or a clogged one. They are very expensive.
Get the air out of your heater core.
heater hoses might have been disconected
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
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!
we changed radaitor & thermastate , now heater blows cold air
It is because your heater is having to heat up so its blowing cold air out while its heating up.This means your heater is not very efficient and it needs to be checked.
A car heater taps off engine heat. If you aren't driving, then the engine is cold and there's no heat for the car heater to use.
Check coolant level Perhaps thermostat is not opening to allow coolant to circulate through engine and heater core
Whats the problem? Blows cold air with the heat settings on?
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
Check antifreeze level, then thermostat next, heater core last
possibly thermostat stuck in the open position?
Because it's broken.
it has a dead raccoon stuck in it
Try your thermostat
An automobile's heater that blows only cold air could either be a faulty thermostat or, more likely, a faulty heater core. A trip to a mechanic or shop that specializes in radiator and cooling system repair should be able to diagnose and repair any problems.
it could be the heater core and ac housing unit that allows hot air to be mixed with the cold air or it could just cancel out the cold due to the motion of the car