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Old 05-12-2021, 05:53 PM   #1
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Dumb Question #9: Can't find the low pressure A/C port....

Spent quite a while today trying to find the low pressure Freon port of the TrempCon dash AC system. I finally found the high pressure port (See picture below). The high pressure port is on the right side of the Onan generator in my 2019 Cornerstone (looking at the front of the coach, its on the right or driver side and above and to the right of the generator. See picture below.

Assumed that I would find the low pressure port close to the same location but a lot of time and a strong flashlight and I came up with nothing. Looked at the opposite side of the generator near the evaporator and fan and found nothing there. Anyone familiar with where I might need to look more carefully?

I assume that it is "hidden" behind something and I am just not seeing it or looking in the wrong place....

Mystified in Louisiana....

Gary
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Old 05-12-2021, 06:03 PM   #2
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It is on the same side as the high pressure, just much higher up.
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Old 05-12-2021, 06:24 PM   #3
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Thanks Gary..... if its much higher up than the high pressure, I don't know how I am going to get to it.... might have to be done on a lift as I am extending about as far up as I can get to get to the high pressure port.

But thanks, tomorrow, I will give the area further up a closer look. May need to hire a skinny 13 year old who can crawl further into the generator cavity than I can ....

Gary
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Old 05-12-2021, 06:34 PM   #4
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Thanks Gary..... if its much higher up than the high pressure, I don't know how I am going to get to it.... might have to be done on a lift as I am extending about as far up as I can get to get to the high pressure port.

But thanks, tomorrow, I will give the area further up a closer look. May need to hire a skinny 13 year old who can crawl further into the generator cavity than I can ....

Gary
It is way up there and a bit tough to get to and hooking up lines is blind with your arm in the way, but it can be done.
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Old 05-12-2021, 06:52 PM   #5
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You guys are right....made one more trip out to the bus to pull in the generator and got flat on my back with the flashlight pointed up, and BINGO, you guys are right. I see the low pressure port much further up and essentially directly over the generator, and located to the side of a main support steel i beam, but the end cap is clearly the blue cap.

I've got the coach lowered with the jacks lifting the rear of the coach up some to get level and the front lower than normal ride height..... when I get 'er up to ride height, or even raised 4" above ride height, that might become more accessible to this old body. I can't think of a 13 year old kid in the neighborhood that might be willing to try to get to it for a $20 bill, and it might be dangerous to try to recruit one outside of a local junior high or elementary school, but I will give it some thought....

Maybe, spending money to get a pro to do it is getting more appealing.

Gary
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Old 05-12-2021, 07:12 PM   #6
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Gary, I realize you found it, but for anyone else looking for the dash AC system's low pressure port, here are a couple of photos. I took the photos from the drivers side of the generator, with the generator fully extended and the front leveling jacks raising the front end of the coach just a bit to make access easier.

Our coach is a 2018. My understanding is that the low pressure port was moved to a more accessible location at some point after our coach was built.

One other note: Most (probably all) of you will not have blue silicone heater hoses. As for why I do, that's a long story for another day.
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Old 05-12-2021, 08:38 PM   #7
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Nice pix Larry..... If I'm not mistaken, that is exactly where mine is located but I was viewing it from the driver side.

Gary
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Old 05-12-2021, 09:02 PM   #8
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Nice pix Larry..... If I'm not mistaken, that is exactly where mine is located but I was viewing it from the driver side.

Gary
Right you are Gary - I typed "passenger side" by mistake. The photos were taken from the driver side of the generator.

Too late to edit the post, so I've contacted a moderator to get it corrected.
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Old 05-13-2021, 02:47 PM   #9
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Well kids .... there is no way that this 74 year old with two artificial knees is ever going to be able to get my hands on the low pressure port on my coach unless I am down in a pit and the coach is comfortably above me and within arm reach.,..... Looks like this is going to involve either a teenager or some hired tech somewhere. I want to try just adding Freon to the system and see if that will get me another year. I have not been impressed with anyone's ability to find and stop a leak so if I could get a year out of a charge, that would be acceptable. Running the genny while driving and the roof AC units has not done a fantastic job keeping the coach cool even in spring weather down here in Texas and Louisiana and July and August would be no fun at all I am sure.

Gary
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Old 05-13-2021, 06:09 PM   #10
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Gary, all you have to do is rent yourself a back-hoe, dig a hole in your front yard of appropriate depth, width and length, drop down into the hole with your handy-dandy AC charging kit, and have Dee drive the coach over the hole.

What could go wrong with a rock-solid plan like that?
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Old 05-13-2021, 06:12 PM   #11
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Well kids .... there is no way that this 74 year old with two artificial knees is ever going to be able to get my hands on the low pressure port on my coach unless I am down in a pit and the coach is comfortably above me and within arm reach.,..... Looks like this is going to involve either a teenager or some hired tech somewhere. I want to try just adding Freon to the system and see if that will get me another year. I have not been impressed with anyone's ability to find and stop a leak so if I could get a year out of a charge, that would be acceptable. Running the genny while driving and the roof AC units has not done a fantastic job keeping the coach cool even in spring weather down here in Texas and Louisiana and July and August would be no fun at all I am sure.

Gary
I know your coach is a 2019, but based on my experience with our 2018...

A month or two is a more realistic expectation.
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Old 05-16-2021, 06:13 PM   #12
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Larry

As usual, I ALWAYS appreciate your sage advice. Had not seriously considered the backhoe idea, but it has possibilities. Thanks ! Our house is at the top of a hill which bizarrely was a riverbed several thousand years ago and is all sand.... I might try the backhoe idea in a buddy's yard at the bottom of the hill, which is at least clay. I'm pretty sure your suggestions are better than trying to recruit an elementary student at the local school to make the connection. Appreciate the help.

I'm going to have to look into an extension for that low pressure port. Gotta be a better way.

Gary
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Old 05-17-2021, 11:12 AM   #13
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Gary. I am at the MH now and just checked the AC connection. If you can get on your knees with your shoulder against the windshield washer fluid tank, it's an easy reach. I just connected mine to see if it worked in case that I needed it on the trip to Vegas.
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Old 05-17-2021, 11:19 AM   #14
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Gary. I am at the MH now and just checked the AC connection. If you can get on your knees with your shoulder against the windshield washer fluid tank, it's an easy reach. I just connected mine to see if it worked in case that I needed it on the trip to Vegas.
Come on Chuck - I almost had him talked into digging a big hole in his (or his neighbor's) yard!
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