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Special Service Mustang Tech Any and all technical questions for SSP cars. |
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#1
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A/C & Heat all going thru Defrosters
Recently had to replace my heater control because the indicator switch would not switch from panel, floor, mix, etc.... Every setting would cause the air to flow through the defroster at the top of the dash as a default.
I replaced the complete heater control unit and now it switches correctly as it should "BUT" everything is still coming thru the defroster ??? I checked for vacuum leaks but didn't see any apparent issues? Anyone ever run into this ??
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93 SCHP 92 FHP MCA Member |
#2
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Very tiny black plastic vacuum line running across the top of the firewall. That feeds the climate control assembly. Check that line for vertical breaks or horizontal splits. That's the most common place for a vacuum leak. There are other places of course.
Here is a diagram of the HVAC vacuum controls, courtesy of TMoss (Tom Moss) and veryuseful.com: http://www.veryuseful.com/mustang/te...m_controls.gif |
#3
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Has to be a vacuum leak somewhere, default position with no vacuum is defrost. The vacuum line mentioned above is a good starting point as it is the main vacuum line to your HVAC system.
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-Aaron 1992 SSP Kansas Highway Patrol #264 Troop H 1991 SSP Georgia State Patrol Perm/Trunk #1195, Roof/Badge/Tag #813 |
#4
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Quote:
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Jim for the first time since 1998 there is only two left: 1984 Oregon SP unmarked 1986 Idaho SP |
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