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Old 07-19-2011, 09:31 AM   #1
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Dash A/C blowing out of defrost vents only

I have a 98 Coachmen Santara Diesel. I bought used. The dash A/C & heat are blowing out of defrost vents only. I have read that there may be some vacuum hose loose but have not been able to find anything. Has anyone had any experience like this.

Thank You,

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Old 07-19-2011, 09:36 AM   #2
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The defroster vents are the "fail safe" position the system will default to upon the loss of vacuum. It's the classic sign of a vacuum leak, although it could be a stuck mode door or ruptured actuator diaphragm. If you have a diesel, are you sure that the vacuum pump is working?


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Old 07-19-2011, 09:43 AM   #3
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I am not sure. I am trying to avoid taking it to the shop. The heat and A/C blow great just not out of the correct vents. I looked under the dash and couldn't find anything obvious. I have to admit sometimes it is like looking at s bowl of spaghetti.

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Old 07-19-2011, 10:17 AM   #4
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Scott, I have a Itasca built on a F53 chassis and had the same problem exactly as you described. I went to a local AC shop that I have used for years. They found two problems, one the switch on the dash was defective for switching the modes and also found one of the deverter vacume valves was defective. It works fine now. Bill
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