Forum Discussion

mhbell's avatar
mhbell
Explorer
Oct 16, 2015

Splicing Plastic Vacuum Lines Dash AC Unit

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
UPDATE Thanks everyone for the suggestions I used rubber tubing and slid the two ends into a 4 inch piece after cutting out all of the excess plastic tubing.
THanks again everyone.
Mel
Class A
  • sch911's avatar
    sch911
    Explorer
    Oct 16, 2015
    Rubber vaccum lines with 1/8" ID pushed over the plastic ends.
  • rgatijnet1's avatar
    rgatijnet1
    Explorer III
    Oct 16, 2015
    You may check at Lowes or Home Depot. I have seen that both places have various plastic hose in different diameters. Maybe they will have what you need.
    As a suggestion, you may be able to use the rubber vacuum hose that has an 1/8" INSIDE diameter to act as a splice if nothing else works. Just cut a length of rubber hose and shove the plastic line in to each end.
  • Kayteg1's avatar
    Kayteg1
    Explorer II
    Oct 16, 2015
    x2 on checking if the fittings are the easy disconnect type.
    Posting the picture here might give you more precise advice.
    Making huge slags is typical for manufacturers.
    I just cut off about 5 lb of copper cables from my camper as I did not want the big loops hanging under my kitchen sink.
    You'd think that with price of copper they might want to save the material, but easy assembly is probably more important.
  • harold1946's avatar
    harold1946
    Explorer
    Oct 16, 2015
    Most auto parts store will have the fittings. Cut off the excess and add the splice
  • Ozlander's avatar
    Ozlander
    Explorer
    Oct 16, 2015
    sch911 wrote:
    Rubber vaccum lines with 1/8" ID pushed over the plastic ends.


    10-4. That's what I would do.
  • Lt46's avatar
    Lt46
    Explorer II
    Oct 16, 2015
    sch911 wrote:
    Rubber vaccum lines with 1/8" ID pushed over the plastic ends.


    Yup, that's what worked for me. The rubber tubing was windshield washer rubber tubing. Works great.
  • kdk's avatar
    kdk
    Explorer
    Oct 17, 2015
    Cut the line to length you want with a razor blade. Slide a piece of shrink tubing over one end, butt the two ends together and slide the shrink tubing over the splice joint then shrink with a heat gun. If you want a very durable joint double up on the shrink tubing doing one layer first then slide a second longer piece over the first splice. Used this process many times with excellent results.
    Blessings; kdk

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