Question about 1998 Ford Mustang

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97 mustang air conditioning

'97mustang 3.8. when you turn on the a/c, the cold air blows out the defrost vents only. No matter what position the control is on.What should I look at?

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  • stangchick Oct 02, 2008

    My hot and cold air only come out the defrost as well. My A/C runs cold so I know it's working but it seems that something is closed causing it to only go through defrost. I was given a part number for something that controls the opening and closing of this "door" but have misplaced it. if anyone can help me find this I would greatly appreciate it and will make sure to pass this on to whoever on here has the same issue.

  • hdias73 Oct 22, 2008

    My A/C and heat blow only through the defrost as well, it's not a blend door as I can control the temperature, just not the defrost, vent, floor, etc.

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Many auto cooling/heating systems use a "blend door" which mixes both hot and cold air to provide air at the temperature selected with the temperature control. When the temp control is in the full cold position, the blend door moves to a position which allows only cold air to pass into the cabin/passenger compartment.
That blend door is generally operated with engine primary [unmodified intake manifold pressure] vacuum. IF there is a leak in the primary vacuum line system, then at low engine RPM the leak may bleed off the vacuum necessary to hold the door in the cooling position. Then when driving, the vacuum will be much higher, "over riding" the leak, and allow the vacuum motor, which operates the blend door, to hold the door in the proper position and provide only cold air to the cabin/passenger compartment.

Posted on Jun 24, 2008

This never improves. There dosen't seem to be a vacume leak. engine runs smooth. Are the controls electric on these cars or do you know?

Posted on Jun 27, 2008

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