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Old 12-20-2020, 01:21 PM   #1
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A/C Issues

HI GUYS! I own a 2019 Fleetwood Pace Arrow LXE. The AC on the dashboard works fine when the coach is still. As soon as I start driving it blows out only warm to hot air. Any advice? My dealer ( believe it or not ) can not solve the problem and now Im on the road for the winter. Any advice would be appreciated. Thanks.
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Old 12-20-2020, 01:26 PM   #2
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Did they hang pressure gauges on it ?

If the refregerent charge is a bit high, a high pressure switch may be cutting out, once the RPMs of the compressor increases.
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Old 12-20-2020, 01:45 PM   #3
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Kind of a long shot, but does your coach have vacuum switches for your dash air controls?

Many gassers do, but I've no idea about DPs. Vacuum controls can cause the problem you describe. I had 'em in my previous (gas) coach.

Vacuum controls work by applying or releasing vacuum to "vacuum servos" to move the flapper valves in a dash air system. There is one that opens or covers the various outlets that send air to the floor, dash, and windshield and another that "blends" hot and cold air between the heater core and the A/C core.

The last one sounds like it could be your problem.

Problems arise when there are leaks in the vacuum lines. As long as the engine is pulling a good vacuum everything works, but as soon as it's under load the generated vacuum drops and affected flaps go to their default position.

Leaks can be caused by pinholes or cracks in the vacuum lines, lines that have come off their fittings, or problems with the vacuum accumulator that such a system will have. No idea where it'd be in a DP, but probably somewhere near the vacuum source on the engine.

The accumulator's job is to provide a reservoir of vacuum (weird concept, I know) to keep everything working when engine demand causes generated vacuum to drop. Leaks don't let the accumulator build up the needed reserve.

In my previous coach I had a line come disconnected from the outlet selector switch causing the direction flapper to send everything to the windshield, in the spring, in the deep south. I was able to work around the problem by disconnecting the return spring on the affected vacuum servo and set it manually to send air through the A/C ducts until I could get it fixed.

Of course, if you don't have vacuum controls all of this is entirely irrelevant.



Regards,

Randy
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Old 12-20-2020, 02:02 PM   #4
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Two things I would check first.

Tightness of compressor belt.

Hot water valve to heater core. There should be shut off valves at the engine to test this.

Being a diesel coach it is unlikely you will have vacuum systems. I could be wrong though.

I suspect you have two or three minor issues contributing to your problem.
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Old 12-20-2020, 06:14 PM   #5
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The blend door and the fresh air doors are the 2 places I'd start... If the fresh air door is open and its not designed to be open during AC.... nothing much can happen sitting in the bay.... but at speed you have 40, 50 MPH air pushing lots of air across the coils when its not designed to be....


Or the blend door is not working correctly and it can handle the air flow when its stopped but not going down the road....



My chassis has a small electric vacuum pump to supply vacuum to the vacuum chambers on the coach... a diesel has no vacuum... if you have a gas engine you don't have a vacuum pump but it needs engine vacuum to run the vacuum chambers.... engine vacuum is highest at idle... usually above 25", at cruise I'm guessing you'd be lucky to read 16-18" of vacuum because of the engine load and how it works.... any leak in the vacuum system would mean those chambers won't work correctly against spring tension...



Hope some of this gets you in the right direction
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Old 12-20-2020, 06:22 PM   #6
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Diesels don't produce vacuum, there are no throttle plates restricting the incoming air. The air is actually blown in with turbo chargers.

If it has vacuum controls, there will be a vacuum motor run by electric or air from the brake system. That's something the dealer should have easly checked and wouldn't drop out under load.
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Old 12-20-2020, 06:30 PM   #7
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Vacuum issue or blend door not operating properly. Start checking the vaccum system.

Ken
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Old 12-20-2020, 06:41 PM   #8
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Jelag,

Thanks. I know zip about diesels, but the OPís problem sure sounded like the vacuum related door issue I had. A vacuum pump makes sense.

Regards,

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Old 12-21-2020, 08:15 AM   #9
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Quote:
Originally Posted by groswald View Post
Jelag,



Thanks. I know zip about diesels, but the OPís problem sure sounded like the vacuum related door issue I had. A vacuum pump makes sense.



Regards,



Randy


I always have my generator running. That way you can run the house A/C and heat pumps as needed.
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