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Old 05-28-2020, 09:33 PM   #1
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Ford F53 erratic dash air condtioner

Hey folks, I've been dealing with this issue for years so I figured I've procrastinated enough. My coach is a 2002 Sea Breeze LX 8311 on a Ford V10 chassis.

If I start it up and put the AC on, the AC blows nice and cold. As I put a load on the coach and start driving, the AC becomes very inefficient almost warm air. If I come to a stop light and sit for a couple, the AC progressively gets colder. Then as I start driving again the AC warms up a bit. I'm thinking there's a diverter door of some sorts that is opening up but I'm not sure.

Any thoughts?

Thanks

Zoli
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Old 05-29-2020, 01:02 AM   #2
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Does the air stop blowing out of the dash vents? Sounds like the air is switching to the defrost vents which is default position if the vacuum is low.
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Old 05-29-2020, 04:37 AM   #3
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Two problems that have been brought up in the past, the heater water flow control valve on the firewall was installed backwards. Also there was a vacuum problem addressed by Ford with a service bulletin.
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Old 05-29-2020, 06:26 AM   #4
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Chboone: fan blows consistently at all times

Richard S: would you have a link to that service bulletin?

Thanks
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Old 05-29-2020, 08:24 AM   #5
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more info link https://www.irv2.com/forums/f23/vacu...53-324570.html
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Old 05-29-2020, 09:01 AM   #6
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Make sure the drive belt is tight.
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Old 06-01-2020, 08:57 AM   #7
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Thank you very much for your responses. I looked up the TSB and that was very helpful. I looked under the coach near the passenger front wheel and found the vacuum canister. I found that one of the hoses had deteriorated and the vacuum was never getting to the canister. Replaced the hose and now that is fixed. I did start the coach up and the AC was blowing very cold. I will be on the road next week so I am hoping this is the fix. Thanks for your help!!!!
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