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Old 11-28-2021, 07:18 AM   #1
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A/C stuck in defrost

Does anyone know where the Air Door Actuator is located? I have to change mine because AC is stuck in defrost mode, trying not to make General RV rich from my pocket.

I have a 2004 Coachmen Mirada.

Lee
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Old 11-28-2021, 07:26 AM   #2
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You have a vacuum leak or no vacuum at all. The HVAC system is et up to default to defrost when there is no or inadequate vacuum. Check all the small vacuum lines for leaks. The lines like to determinate over time. A lot of the older coaches used Evans/Tempcon HVAC. Just google them and you will find lots of info. Evans/tempcon is no longer in business but the parts are generic and are available.
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Old 11-28-2021, 07:32 AM   #3
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Air Door Actuator

Check in the front compartment on the left side (in front of passenger}. The actuator is vacuum operated but you should be able to move it by hand. Check for loose hoses from the small vacuum pump and reservoir. Be sure the pump has power and ground.
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Old 11-28-2021, 07:40 AM   #4
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Mine had an SCS/Frigette unit. There should be some info on the build sheet, if you have it, or perhaps somewhere on the unit. I have a schematic of the vacuum lines but it is hiding in my computer somewhere. Perhaps someone else can find it for you but I will keep looking.
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Old 11-28-2021, 10:07 AM   #5
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Welcome to iRV2.

Your dash HVAC controls are vacuum operated , as mentioned by other members , on gas chassis coaches the vacuum is supplied by the engine intake manifold , on diesel coaches the system uses a 12 volt vacuum pump to supply the dash controls.
What is common between gas and diesel chassis is a vacuum reservoir ( usually a soft ball size black plastic unit) that's the first place to check for vacuum , before you go behind the dash looking for your problem.

Yellow box in photo.
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Old 11-30-2021, 10:59 AM   #6
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Hello David,

Did you happen to find the schematic? My email address is leureste@yahoo.com




Quote:
Originally Posted by David 70 View Post
Mine had an SCS/Frigette unit. There should be some info on the build sheet, if you have it, or perhaps somewhere on the unit. I have a schematic of the vacuum lines but it is hiding in my computer somewhere. Perhaps someone else can find it for you but I will keep looking.
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Old 11-30-2021, 05:33 PM   #7
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https://www.irv2.com/forums/f8/

Go to post 4 and click on the link. It has one of the many schematic. This one should be for a dp which I assume you have. I will look in my other computer and see if I can find the one for a gasser.
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Old 11-30-2021, 06:40 PM   #8
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https://www.rv.net/forum/index.cfm/f...print/true.cfm
Here is guy with a 2001 Mirada with the same problem you are having
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Old 12-03-2021, 05:32 PM   #9
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Ok, I fixed it...thanks David 70 for pointing in the right direction here https://www.rv.net/forum/index.cfm/f...print/true.cfm

I found 2 problems, vacuum line by right valve cove gasket was disconnected and a broken deteriorated line in front of the right tire Bumper area.
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