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Old 03-21-2012, 07:20 PM   #1
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Dash heater problem

Dash heater on 02 Winnebago Journey DL 36GD will not switch from heater outlets to defroster outlets.
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Old 03-21-2012, 11:50 PM   #2
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if it has a gas engine there are usually vacum contols on the blend doors.
Look for a damaged vac hose under the hood.
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Old 03-22-2012, 06:51 AM   #3
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Sounds like your vacuum pump isn't working or you have a vacuum leak. The pump is located under your dash. You should hear it running when you turn on the key to start the engine. If it is running you probally have a leak in one on the hoses or connections. Also check under the front hood as a vacuum elbow had a tendencty to split. If you do a search their are pictures of this elbow.

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Old 03-24-2012, 08:13 AM   #4
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http://www.irv2.com/forums/f101/vacu...one-44852.html

Check out this thread, It just might be your problem.
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Old 03-24-2012, 02:02 PM   #5
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Unhappy Vacuum/Air

I have not seen a Diesel unit with vacuum. As far as I know they all operate everything with Air Pressure. Take off a line with the coach running and you should feel air pressure
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Old 03-24-2012, 02:12 PM   #6
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Quote:
Originally Posted by lwasouth View Post
I have not seen a Diesel unit with vacuum. As far as I know they all operate everything with Air Pressure. Take off a line with the coach running and you should feel air pressure

Diesels have a 12 small 12V vacuum pump to operate all the controls of the dash heat/ac system.

On gas engine coaches they can tap into the engine vacuum.

I am sure all dash/AC systems work the same, probably most all from the same vendor.
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Old 03-25-2012, 07:27 AM   #7
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Dash air/vacuum

Maybe I mistated regarding the vacuum. My experience is with the Freightliner Chassis which used air pressure for all control systems
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Old 03-25-2012, 08:30 AM   #8
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Maybe I mistated regarding the vacuum. My experience is with the Freightliner Chassis which used air pressure for all control systems
Every freightliner I ever worked had a small electric vacumn pump.
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Old 03-25-2012, 08:33 AM   #9
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Quote:
Originally Posted by lwasouth View Post
Maybe I mistated regarding the vacuum. My experience is with the Freightliner Chassis which used air pressure for all control systems
On my freightliner chassis there is a vaccum pump that goes to an accumilator tank, the little black baseball sized tank, then to the controls of the heater/AC system. The on/off valve that shuts the flow of hot water on and off for this system ex: is run off vacuum.

Not being argumentive here, but thats just how it works.

The air pressure system on mine is for the brakes and the airbags that support the coach and give us that comfortable ride we enjoy.
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Old 03-25-2012, 05:18 PM   #10
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Mine is as RCtime describes. When my controls failed I found a small rubber hose had split at the end. I trimmed the hose and all is working.
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