Question about 1997 Mercury Mountaineer

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Vents blowing HOT air all the time!

Regardless of where the hot/cold (red/blue) dial is set, or which vent setting (defroster, upper vent or lower vent) the air coming through the vents is really HOT! We thought it was the control panel and replaced it with another one from a used parts store, but nothing changed. This wasn't such a big deal in the winter when it was cold and I wanted hot air blowing, but now that it's warm, this has to be fixed soon. Any ideas? Anyone have a preference for "best" repair manual that includes vacuum lines and electrical? Thanks!

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  • 7 Answers

Check your vent doors in your dash it appen to my f 150 and closeing them helped from pulling heat from the motor

Posted on Apr 30, 2013

Testimonial: "Thanks. Are you saying it could be stuck open and needs to be replaced or that you just stopped the hot air by closing yours manually?"

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alicantecoli
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SOURCE: 2000 Mercury Grand Marquis will only blow hot air when ac is on

needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved

Posted on Jun 21, 2009

  • 61 Answers

SOURCE: 2001 merc sable blows only from bottom vents

the selection is done by a flap in the duct which is controlled by a rod or vaccum . the flap may be stuck, the rod bent broken or disconnected.vaccum blocked, crimped or disconnectd. the glove box comes out, that might help access

Posted on Jul 27, 2009

  • 490 Answers

SOURCE: this car has the automatic temperature control system

The hot/cold switch is probably bad.you have a blend door box that opens to let the cold air in and closes to let the hot air in.From what you are saying this part is no responding to the switch movement.Make sure power is at the switch and power should go through the switch when put on cold air this moves the blend door.Some times the blend door goes bad and has to be replaced its under the dash on the right side.

Posted on Aug 10, 2009

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The hot/cold switch is probably bad.you have a blend door box that opens to let the cold air in and closes to let the hot air in.From what you are saying this part is no responding to the switch movement.Make sure power is at the switch and power should go through the switch when put on cold air this moves the blend door.Some times the blend door goes bad and has to be replaced its under the dash on the right side.

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