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Old 11-22-2010, 07:40 AM   #11
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Join Date: Sep 2008
Location: Shenandoah Valley
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Originally Posted by qmrichardson View Post
I asked the technician at my local RV shop what his thoughts were on the compressed air technique and he feels the air can blow right over the top of water sitting in low points. He also felt it was important to circulate the antifreeze because it needs to be inside the water pump as well... so I went back and re-did mine just to be safe.
Ah ha...... confirmation on my thinking in post #4.


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Old 11-22-2010, 08:08 AM   #12
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Location: Louisville, KY
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Some folks just use air and get by with it year after year.
I also believe that it would be possible for water to collect in
a low point and freeze even after blowing out.

I do both-- in my trailer there is a little "dead zone" in the
water heater bypass area. This short length of hose does not
get antifreeze when in bypass mode.

I drain my WH and leave the plug out.
I blow the system with air while the bypass is in normal use mode.
Then I switch to bypass mode and pump in RV antifreeze using
the onboard pump.

The whole process takes me 30 minutes and a gallon and just a tad
more of antifreeze.

In the spring we flush lines briefly and for the first couple of trips
we use a blue jug for fresh water for drinking and coffee.
After that, the minimal taste is gone and we can use the water
system for making coffee and drinking.


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Old 11-22-2010, 09:35 AM   #13
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Location: Saskatchewan, Canada
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id say air is an option but antifreeze would work for sure

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