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The heater core is blocked, or a heater hose has collapsed, keeping hot engine coolant from getting to the core. The "blend air" door may be stuck in the open position, keeping warm air from circulating, and dumping in cold outside air. I am assuming that engine coolant and water pump is good.
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∙ 7y ago
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Why would a house heater blow out cold air?
It doesn't really blow it out it just warms the cold air.
Why does your heater blow cold air in your truck?
Low on coolant. Stuck open thermostat. Plugged heater core. Faulty temp blend door.
Why would you smell antifreeze and heater blow cold air?
heater core possibly plugged and leaking
Would straight antifreeze make heater blow cold air?
No! Thermostat.
Why would a back heater blow cold air and front heater blow hot air in a 2003 Chevrolet Suburban?
The front expansion valve is clogged.
Why would heater blow out hot in the summer and cold in the winter?
Could be a bad thermostat.
How will the heater react if the heater core is stopped up?
Your heater will blow cold air only.
Why does your truck blow cold air?
Assuming you want it to blow hot air, you may be low on coolant or have a stuck open thermostat or a plugged heater core or you have a faulty temperature blend door actuator.
Why would a 2001 Chevy Blazer heater only blow cold air?
Low coolant in the system. Defective heater control valve. Clogged heater core.
Why would cold air blow out when you turn on the heater?
engine not warm, low coolant, or stuck thermostat
What is causing the heater to blow cold air in 2002 Mercury Mountaineer?
you would have to see a mechanic about that problem
What could be the reasons that your 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold etc?
One of the reasons a 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold might be that there is a problem with the hot/cold duct. The air or a vent might be inadvertently blowing periodically.
