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Auto Parts and Repairs
Air Conditioning and Coolant
Heater Cores and Blower Fans
Car Heaters

Why would the heater core warm up but not blow any warm air through the vents or defroster in a 1999 Mercury Mountaineer?


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Wiki User
2004-11-08 09:49:41
2004-11-08 09:49:41

The mixing door isn't working. Take it to the garage as it porbably is the controler. First make sure there is vacuum getting inside the cab from the engine.

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Assuming your temperature selector is not on "cold", the heater core is likely bad

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This is a big job.. Get a manual on your car from DISCOUNTAUTOREPAIRMANUALS.COM .

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you would have to see a mechanic about that problem

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Behind / below the glove compartment area inside a plastic case . You can see where the heater hoses connect to the heater core at the firewall in the engine compartment

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Behind the glove compartment area inside a plastic case . From the engine compartment you can see where the two heater hoses connect to the heater core at the firewall


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