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You should check your water level. It's low, and you have a leak. Get someone to check it for you.
The heater in your car works off the water from your radiator, no water in the radiator will over heat the engine ergo top up the water.
Could also be low antifreeze level causing water in radiator to freeze making the engine overheat and the heater to blow cold air.
You have an airlock. If you have a system with expansion/filler tank then check the return pipe is not blocked. These systems bleed themselves if there are no blockages.Mine was because the impeller in the water pump had disintegrated to the point where it would not move the water. The water would overheat, but the hot water would not get moved into the heater core to blow hot air. I replaced the water pump and it all works now.
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∙ 10y ago
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Why would your heat only work on defrost?
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?
1996 vw sharan heater blows cold cabin hot?
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
Why would an engine run cold temp gauge says cold and the heater blows slightly warm air?
change t.stat
If the heater works but blows cold air and heater core is good what do i check next?
Get the air out of your heater core.
Ac works but heater blows cold air?
heater hoses might have been disconected
Your heater in your jeep only blows cold air why is this?
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.
Heater problems on ford 1999 expedition?
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
Why does Heater blows cold air on 2001 blazer?
you must have low coolant or a bad heater core
2002 dodge ram 1500 4.7 liter heater not working blows but not hot air?
we changed radaitor & thermastate , now heater blows cold air
Why would a car only blow cold air when driving?
Only blows cold air with the a/c on while driving, your cooling fan or fan clutch is bad depending on the year, make and model.......... Only blows cold air with the heater on while driving, you will have a bad or broken internal a/c - heater control door.....
Why does your heater blows cold then hot then cold then hot?
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.
Car heater blows cold air when not driving?
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.
