92 F150 ac problem

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  #1  
Old 08-13-05, 09:07 AM
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92 F150 ac problem

When i use my ac in my truck, it works fine on normal and as soon as I put it on max, the air starts coming out at the defrost. what could cause this, thanks.
 
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  #2  
Old 08-13-05, 12:36 PM
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vacum problem, probably in the control head if you have no other related problems the vacum switch is probably leaking unsure if you can just replace the vacum switch on your model or if it requires the complete control head.
 
  #3  
Old 08-14-05, 06:12 AM
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Check the white plastic vacuum hose going to the vacuum motor on the right side. Under the hood on top of the evaporator case. These hoses are known for cracking. If so splice the plastic hose with rubber washer nozzle hose.
 
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