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The most common cause of this failure is a broken blend door. Check heatertreater.net for diagnostic information and an inexpensive fix.
Make sure your antifreeze levels are adequate (if it is too low, then there will not be enough hot antifreeze to flow through the heater core to make ther air warm.) I had this problem in my blazer and it fixed it right away. If that does not work, your heater core could be bad and a new one cost between 40-100 dollars and installation would probably be about the same. my ford puma has the same problem, i was losing coolant through the heater control valve on the bulkhead of the car so had to temp bypass it but if the valve stops working or the plug comes adrift it will stop warm water getting into the heater system in the car so i would check the heater control valve. you can buy them from eBay for about £12.
COULD BE A BAD HEATER CORE COULD BE A BAD HEATER CORE sounds like the heater control switch needs replacing.if that doesnt fix it, you need new heater core
no no
This can happen if the water or coolant level in the radiator is low. There are other causes but this is the most common.
it could be your fan motor is going to go
Check coolant level? Heater core plugged or restricted? Heater core airbound? Bad thermostat? Water pump not circulating coolant? Heater control cable not adjusted properly?
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.
Replace it with a new one.
Take it 2 a mechanic. :D
Take it to a mechanic and say "will you fix the heater core?"
AnswerDepends whats broken ie. blows cold, no blower at all ???????no blower at all