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You may be low on coolant, or the thermostat is stuck open, or the heater core is plugged up, or the temp blend door is broken.
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∙ 14y ago
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What is wrong with your heater on your 2001 mercury grand marquis if it only blows cold air?
You are likely in an antarctic region.
When idling a 2002 freightliner the temp drops and the heater blows cold air what is wrong?
You probably have a bad thermostat.
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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
If the heater works but blows cold air and heater core is good what do i check next?
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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?
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you must have low coolant or a bad heater core
What causes cold air to come out of air vents when heater not on?
The heater may not be on - but the fan still blows air through the vents when they're open !
