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Old 02-20-2018, 04:38 PM   #1
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Brand: Thor Motor Coach
Model: challenger 37YT
State: Michigan
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What now ???

I have a 2017 Challenger 37YT.
I went out to get the fire extinguisher for the recall and noticed antifreeze coming out from under the bed running down the center of the coach, it also looks like the water dispenser or ice maker ran some down the fridge.
Motorhome has been stored inside since the dealer winterized it.
I called the dealer because at the end of the month, the one yr warranty is expired.
Any ideas what to expect or what the cause could be ?
Canít wait for the bugs to get worked out so I can stop worrying whatís going to happen next.
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Old 02-20-2018, 05:41 PM   #2
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Service manager called back and said they are working with Thor to find out why this is happening, itís happening a lot I guess. He said itís from the PEX tubing expanding and contracting so much in extreme weather. He said every time they explore the problem, they canít find a leak.
I guess maybe they should blow out the lines with air after adding antifreeze. I know I will be.
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Old 02-20-2018, 08:27 PM   #3
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Originally Posted by rick kirby View Post
Service manager called back and said they are working with Thor to find out why this is happening, itís happening a lot I guess. He said itís from the PEX tubing expanding and contracting so much in extreme weather. He said every time they explore the problem, they canít find a leak.
I guess maybe they should blow out the lines with air after adding antifreeze. I know I will be.
Rick- I don't doubt your dealer's veracity but I'd give Thor Technical support a call. If your coach has been stored inside and was winterized properly, I cannot understand the PEX explanation. I will say that if you use air to blow out your water lines, you should make sure commodes are held open also to avoid blowing seals at commode.
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Old 02-20-2018, 09:06 PM   #4
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R... I will say that if you use air to blow out your water lines, you should make sure commodes are held open also to avoid blowing seals at commode.
The air should be regulated to no more than normal water pressure... Shouldn't be an issue with blowing seals anywhere in that case.

I set my regulator in the 45-50psi range when blowing out lines.
Older RV's should be set lower.
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Old 02-20-2018, 09:42 PM   #5
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Thanks guys. Will call and will remember regulator settings.
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Old 02-21-2018, 12:58 AM   #6
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Yep - forgot the setting the pressure regulator to 40PSI. I still hold open the commodes to prevent any seal issues..
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Old 02-21-2018, 01:34 PM   #7
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Called Thor tech support. He said there isnít any water lines running under the bed. Well geez, I have a bed that bleeds antifreeze.
The adventure with this coach continues.
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Old 02-21-2018, 01:41 PM   #8
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That Fridge is about as close to your bedroom as it can get.
Ir's very possible that the water is just running laterally, and your bed is where you're finding it.

Good luck with getting a handle on this situation!
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Old 02-21-2018, 02:26 PM   #9
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What now ???

I was walking around the outside, you know, wondering what the hell i have done, and noticed the hot water heater is located to the rear of the coach, under the bed ?I drained all the low point drains. Now I wait until itís warm enough to pull outside. Canít open slide because I have a car stored next to it.
Time will tell.
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Old 02-21-2018, 06:08 PM   #10
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Good luck!
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Old 02-21-2018, 08:23 PM   #11
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Originally Posted by rick kirby View Post
I was walking around the outside, you know, wondering what the hell i have done, and noticed the hot water heater is located to the rear of the coach, under the bed ?I drained all the low point drains. Now I wait until itís warm enough to pull outside. Canít open slide because I have a car stored next to it.
Time will tell.
So that tells me your dealer didn't do a damn thing! Fairly certain my water heater has"water lines" running to it, yet after they checked yours there's "no water lines under the bed"???
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Old 02-21-2018, 08:25 PM   #12
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Originally Posted by rick kirby View Post
I was walking around the outside, you know, wondering what the hell i have done, and noticed the hot water heater is located to the rear of the coach, under the bed ?I drained all the low point drains. Now I wait until itís warm enough to pull outside. Canít open slide because I have a car stored next to it.
Time will tell.
So that tells me your dealer didn't do a damn thing! Fairly certain my water heater has"water lines" running to it, yet after they checked yours there's "no water lines under the bed"???
Find another dealer, maybe one that can recognize a water line, water heater, or underneath the bed.
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Old 02-21-2018, 08:36 PM   #13
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I didnít have the coach in recently, while they had it in November I had them winterize it. The leak started almost 3 months later, they havenít had a chance to check it out. He did say they had some new ones on the lot that did the same thing and when they took them in, couldnít find any leaks under water pressure.
Beats me b
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