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Old 06-11-2017, 05:45 PM   #1
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Vacuum tube for AC on 2000 Chieftain

Just got home today from camping this weekend and noticed a tiny blue hose hanging down from what I believe is the AC unit on the front passenger side by the wheel. Found the other piece of hose where it enters the firewall into the cab. Interestingly my AC no longer seems to blow cold air. The tube was cracked and flaking in several areas. Can someone tell me if they know where I should look in the dash to find where the tube connects. The AC was working when I left on Friday so I'm assuming this hose has something to do with it.

Thanks
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Old 06-11-2017, 06:01 PM   #2
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Welcome to the forum.
I personally have no clue as to where your vacuum hoses are routed other than they can actuate several plenum vent doors or valves.
It would probably be helpful if you included the age, make, and model of your RV & motor chassis series so others with direct product knowledge might assist.

Be well.
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Old 06-11-2017, 06:03 PM   #3
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Sometimes you can find them in the auto parts stores, but I usually repair them by slipping a length or two of shrink tubing over the two ends placed back together.

If you have one of these hoses cracked/broken in two, you will have more later, they do that from age and heat.

The problem I've found in replacing them is, if they have a 90 degree rubber slip on connector on the end, you will break that too trying to replace the hose.

Shrink tubing overlapped will give you a permanent fix, and will reinforce the hose in the area you spliced it back together.

DTW
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Old 06-11-2017, 06:07 PM   #4
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Thanks for the info. I will try the repair although there isn't much good hose to work with.
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Old 06-11-2017, 06:16 PM   #5
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Quote:
Originally Posted by Dtwallace View Post
Sometimes you can find them in the auto parts stores, but I usually repair them by slipping a length or two of shrink tubing over the two ends placed back together.

If you have one of these hoses cracked/broken in two, you will have more later, they do that from age and heat.

The problem I've found in replacing them is, if they have a 90 degree rubber slip on connector on the end, you will break that too trying to replace the hose.

Shrink tubing overlapped will give you a permanent fix, and will reinforce the hose in the area you spliced it back together.

DTW
I hadn't thought of shrink tubing to fix them. Great idea!
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Old 06-11-2017, 08:09 PM   #6
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On my Horizon the blue hose goes to the vacuum actuator that operates the air recirculate door. If your 2000 Winnebago is similar to my 2002 Itasca then when you turn the dash HVAC knob to a/c max it sends vacuum to this door shutting off the hot outside air flow and allowing the cool inside air to recirculate. I repaired a hole in mine with a short piece of vacuum hose.
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Old 06-11-2017, 09:03 PM   #7
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Quote:
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On my Horizon the blue hose goes to the vacuum actuator that operates the air recirculate door. If your 2000 Winnebago is similar to my 2002 Itasca then when you turn the dash HVAC knob to a/c max it sends vacuum to this door shutting off the hot outside air flow and allowing the cool inside air to recirculate. I repaired a hole in mine with a short piece of vacuum hose.
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Old 06-18-2017, 11:05 AM   #8
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Thanks for the advice. Replaced a section of hose and used the heat shrink to join the ends. Everything is working again!
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Old 06-19-2017, 02:40 AM   #9
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Thanks for the reply/update, It's a good feeling to know you have helped someone in a time of need....
DTW
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Old 06-19-2017, 02:31 PM   #10
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Vacuum Line Blues....

I have been fighting vacuum hose routing/decay issues myself this weekend. I found the Blue and the Green vacuum motor lines had been chafed through by the way they were run with the blower motor power supply wires being wrapped around them. The cooling has been less than satisfactory and worsening here lately. I will be off to the parts store to buy all new tubing and connector boots this weekend.

Oh, and here is an excellent resource: Winnebago Vacuum & Electrical Diagrams for Motor Homes.

There are a few good posts about vacuum line issues within the Winnebago owners board here too. I've just read through most of them!
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