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Old 10-16-2015, 10:01 AM   #1
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Unhappy Splicing Plastic Vacuum Lines

I have a Evans Tempcon Dash AC Unit. Most newer RV's have this. The Vacuum lines are small 1/8th inch dia, and are made of a plastic like material. They are way to long and Thor (Four Winds) chose to fold them up and secure to the outer firewall with nylon ties. After time they will kink cutting off the Vacuum to the Dash AC. They are almost 3 to 4 feet to long. Does anyone know how to cut and splice them. I am sure this is what is causing my Dash AC Problems and lack of vacuum.
Mel
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Old 10-16-2015, 10:11 AM   #2
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Rubber vacuum hose is available in a size that is a tight fit to the outside diameter of the plastic tube, so take a size sample to your local auto parts store and pick up a couple of feet of the correct size hose. Cut the excess tube and push the ends 2" into a 4" long piece of hose.
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Old 10-16-2015, 10:23 AM   #3
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Quote:
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Rubber vacuum hose is available in a size that is a tight fit to the outside diameter of the plastic tube, so take a size sample to your local auto parts store and pick up a couple of feet of the correct size hose. Cut the excess tube and push the ends 2" into a 4" long piece of hose.
spray a little WD 40 in the vacuum hose and it will slide right in!!
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Old 10-16-2015, 03:22 PM   #4
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I would slip rubber hose of the proper ID over them. myself.
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Old 10-16-2015, 03:57 PM   #5
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I did what skip426 suggested. Worked fine.
Mel
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Old 10-16-2015, 06:33 PM   #6
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Just went through this with my 2006 four winds windsport. I bought a vacuum gauge while I was camping as my dash ac kept diverting from center to defrost. In a nutshell, the Ford provided vacuum canister under the right front bumper was toasted. It sucked itself in from vacuum. I tried to fix it but ended up bypassing it while on a trip. The evans tempcon system had it's own small canister so I didn't really need the huge ford canister. I did replace it but you should follow the evans tempcon troubleshooting guide for vacuum issues. Your small lines may be ok.
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Old 10-16-2015, 07:47 PM   #7
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Trouble shooting

Quote:
Originally Posted by Pirate View Post
Just went through this with my 2006 four winds windsport. I bought a vacuum gauge while I was camping as my dash ac kept diverting from center to defrost. In a nutshell, the Ford provided vacuum canister under the right front bumper was toasted. It sucked itself in from vacuum. I tried to fix it but ended up bypassing it while on a trip. The evans tempcon system had it's own small canister so I didn't really need the huge ford canister. I did replace it but you should follow the evans tempcon troubleshooting guide for vacuum issues. Your small lines may be ok.
I have followed the Evans Tempcon trouble shooting guide for Vacuum leaks. It appears that there is a leak because no matter what position the mode switch is in it blows air out the defrosters. According to what I have read that means a severe vacuum leak somewhere in the main system. I have good vacume from the engine up to and including the evans tempcon black ball resevoir output. The heater defroster, floor, multi are all working from the mode switch so I have to assume that the black Vacuum source line is not leaking from the black ball to the mode control. I have taken the dash apart to get to the AC and heater control center. Could find no problem with the vacuum harness connection. I am about ready to pull my hair out. I am beginning to wonder if the defroster door is stuck open or a bad mode switch.
Mel
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