Question about 1998 Mercury Mountaineer

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Heater temp on mercury '98 mountaineer only blows hot

The heater blow out hot air no matter where I turn the temperature dial to. Even when its turned all the way to cool. When I turn the A/C on, the A/c works but you can still feel the hot air mixing in. It worked fine yesterday. Is it the switch? It turns and stops where its suppose to. Lights up. The heater is always blowing hot air I turn the temp dial and nothing seems to happen I read his solution but that doesn't answer how to fix it

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  • Mercury Master
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Everything that is heat and cooling in a vehicle is controlled by vacuum from the engine. It appears to me that your blend door vacuum line to the temp control switch is either off or cracked/broken and not making things work the way you want/expect. It's the vacuum friend.

Posted on Jul 01, 2017

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warlock61
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SOURCE: Heater temp on mercury '98 mountaineer only blows hot

could be the blend door motor or the door could be broken these are common

Posted on May 09, 2009

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Heater temp on mercury '98 mountaineer only blows hot


could be the blend door motor or the door could be broken these are common

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You can't even reach the door without pulling the dash assembly out, then u might as well fix the problem,

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