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Old 04-20-2020, 03:03 PM   #1
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Can we safely blow lines out in 2019 Greyhawk at end of season

Hi All! We are newbies that spent last summer trying out different brands and lengths of motorhomes, and bought our Greyhawk 29mv last fall. Like everyone else - we are itching to get out and break it in!! We did dry camp for a few nights a few miles from home (ahhh!) because we just had to try it out and were so tired of being home. It was wonderful, and then the weather here in Colorado got down into the 20's again! Instead of rewinterizing it again with RV antifreeze and having to dewinterize it a second time, we were able to borrow our son's shop to park it in since his is not an 'essential' business. Whew! We would like to know if we can use our compressor to blow the lines out instead of using the RV antifreeze, and if we can - where do we attach it - how do we do it - what do we need to be careful of? There's nothing in the manual about it - so the newbies thought they'd check with all the experts!! Thanks!!!
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Old 04-20-2020, 03:16 PM   #2
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there is a fitting you can buy that screws into your water inlet port.. where you hook up your water hose.. and it has the nipple on it to hook up to a air hose to compressor.. never exceed 45 psi being delivered to your water lines in the rv.. go thru the rv and turn on faucets and outsided shower one at a time until nothing but air comes out.. then you need rv antifreeze in the sink and shower traps. Drain the water heater. your pretty much all set.. I do it all the time on our motorhome.
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Old 04-20-2020, 03:16 PM   #3
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Blowing out the 'lines' (hot and cold) is an OK method in areas when temps do NOT get down into the freezing zone (below 32*F for several hours)


In freezing temp zone....safest method is the drain/pump anti-freeze method
Blowing out lines can leave pockets of water in low spots which can freeze and cause damage.


Blow out method uses an 'air adapter' that screws into city water inlet and then air supply hose is connected.......low pressure air (40# or less) is then blown thru hot/cold lines and out the faucet/showers/toilet/Low Point drains

Home Depot/Lowes/Camping World/Amazon etc ---$5
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Old 04-20-2020, 03:19 PM   #4
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good picture old biscuit.. I made my own from a pvc threaded plug and a nipple from harbor freight.. actually I made several. Still in Tucson and hope to go home to Missouri in 2 weeks.. avoiding the virus..
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Old 04-20-2020, 03:22 PM   #5
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What I did:
Took a piece of garden hose with the male end on it that matches up to my water line.
Put a shutoff valve on it.
Added a quick disconnect for the air line.
Used an oilless air compressor.
Went into our coach and opened all the faucets and tank drains.
Turned on the air into the coach.
Shut the farthest or highest opening first, then worked my way back down to the drain outlet.
Tried to keep the air pressure under 45 PSI.
Our coach is 36' and a 1989 Foretravel GV. No leaks in the ten years we have owned it.
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Old 05-14-2020, 03:36 PM   #6
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I currently have a 29mv and had another class C for the previous 10 years. I have always used the blowdown method for winterizing and never had a problem. In Oregon we see temps into the low 20's, maybe a few nights into the teens. I suggest using a lower pressure, like 20psi and then move from faucet to faucet and just crack it open a bit (don't forget shower and toilet) until you are getting mostly all air. The lower pressure and slow flow rate will minimize the amount of spitting and how much water trickles back into the line. You may need to make the rounds several times so just be patient. Also, drain your hot water tank before starting to speed things up.

As Old-Biscuit mentioned, get the quick connect adapter, it makes it super easy to connect the compressor to your water inlet. Also, don't forget to pour some RV anti-freeze into the drain traps and toilet when all finished.
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Old 05-16-2020, 08:13 PM   #7
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I had a 2017 Grey, and if you use air to purge it, don't forget about the water filter cartridge under the sink. It won't empty of water, so use the filter wrench, take it off and dump it then screw back on. If any rv antifreeze was put in that filter it needs to be thrown out and replaced with new.
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Old 05-16-2020, 08:24 PM   #8
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If you have long term freezing temps, I'd still use RV antifreeze. Going back to when I had travel trailers, I like to use a air compressor to clear the lines of water. Than, I have always used RV antifreeze. It doesn't take much time nor money and will avoid the possibility of having a problem with damage caused by frozen lines. Don't forget to drain the hot water tank and turn valves to the bypass position.
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Old 05-16-2020, 08:27 PM   #9
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Remember , blowing the lines , won't clear the 12 volt pump of water and may leave water in the fresh to pump supply line .
So after you blow the system through the city water hook up , and drain the fresh tank , remove the outlet line from the 12 volt pump and run it dry ( or better yet , remove the pump from the RV and store in a warm place).

DO NOT ask why I know this.
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