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Old 08-06-2021, 09:07 AM   #281
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Originally Posted by PeterH-350LE View Post
7819 is what I used. I do not know enough about it to determine if your compressor is at fault. All I see is that the 7819 is 134a specific. Just curious. did you replace the high pressure line?

https://www.autoaironline.com/ac-par...ompressor-2253
https://www.autoaironline.com/ac-par...ompressor-2702
7819 is the same one I installed.
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Old 08-06-2021, 09:43 AM   #282
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So here are the pressures.
First one is equalized not running, which looks high on the low side.
Second one is running. It appears there is a vacuum, which would lead to believe a blockage on the low side or blocked txV but that is brand newÖ
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And running

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I canít check the high side yet as I donít have a proper fitting.
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Old 08-06-2021, 03:35 PM   #283
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Originally Posted by Roby466 View Post
So here are the pressures.
First one is equalized not running, which looks high on the low side.
Second one is running. It appears there is a vacuum, which would lead to believe a blockage on the low side or blocked txV but that is brand newÖ
Attachment 401165
And running

Attachment 401166


I canít check the high side yet as I donít have a proper fitting.

Can post a picture of your fittings at the compressor?
Here is a good video

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Old 08-07-2021, 07:01 AM   #284
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1988 34.5' Airstream 345
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A truck shop filled it up but based on my spec for capacity. And they only had access to the low side. I think they may have missed the need to install a fitting on the dryer to access the high side.
I will have the system emptied when I return from this trip (2000miles round trip in 2 weeks without AC) and Iíll flush and clear the system then before re-filling.
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Old 08-07-2021, 09:08 AM   #285
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The problem with our systems is that they are built from components
from various suppliers. There is no sticker that says how much
freon is supposed to be in the system. With that the only way to
know how much to put in is to use the temperature/pressure chart.
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Old 08-12-2021, 05:42 AM   #286
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That makes sense. My plan as I have a vacuum at the compressor is to figure out how first so Iíll have it pumped out and go from there. I somehow suspect that they may have broken the txV sensing bulb line when installing it. Iíll blow air through all other components to make sure all is clear and then replace the txV if it doesnít work properly.
Iím not sure if I should also do a ę*flush*Ľ of the system to get rid of any residual mineral oil from in there and Iíll check for a new hp hose if thatís available as Iíll be breaking the system open anyway.
Iíll put in a new dryer with a sight glass to help us refill properly.
Then Iíll tactfully educate the tech into using the pressure-temp charts and sight glass to refill and hopefully next season Iíll have AC.
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Old 08-12-2021, 05:49 AM   #287
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Weíre 900 miles into our 1700 miles trip. No AC . It has been warm but not unbearable. It would be very nice to have AC next time.
We have camped in some nice spots and have spent many days on the beach . The kids even got the chance to play in an RCMP car when they paid us a visit while boondocking. Somebody called the cops on us thinking we were running a ę*breaking bad*Ľ operation. The police officer was very nice, the kids played with his siren and lights and the person who called them was likely kept awake due to the sirens noise

So what I need to fix now: oil pressure sender died, my fuel gauge is still not working and now the trip reset knob has cracked and fallen off so that is a bit annoying, exhaust manifold leak, I suppose on the driver side now as the passenger side was just fixed, minor so far, and although the PO said he put new shocks, the front ones are very inadequate so Iíll be upgrading those when we get back.
Oh yeah, roof ACs both leak through a bit so when we drive off after a rainfall overnight, we get a waterfall from the ACs.
Very nice trip overall!
Cheers
David
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Old 08-12-2021, 06:42 AM   #288
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Quote:
Originally Posted by Roby466 View Post
Weíre 900 miles into our 1700 miles trip. No AC . It has been warm but not unbearable. It would be very nice to have AC next time.
We have camped in some nice spots and have spent many days on the beach . The kids even got the chance to play in an RCMP car when they paid us a visit while boondocking. Somebody called the cops on us thinking we were running a ę*breaking bad*Ľ operation. The police officer was very nice, the kids played with his siren and lights and the person who called them was likely kept awake due to the sirens noise

So what I need to fix now: oil pressure sender died, my fuel gauge is still not working and now the trip reset knob has cracked and fallen off so that is a bit annoying, exhaust manifold leak, I suppose on the driver side now as the passenger side was just fixed, minor so far, and although the PO said he put new shocks, the front ones are very inadequate so Iíll be upgrading those when we get back.
Oh yeah, roof ACs both leak through a bit so when we drive off after a rainfall overnight, we get a waterfall from the ACs.
Very nice trip overall!
Cheers
David
Attachment 401649

Awesome memories in the making ...!! Onward
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Old 08-12-2021, 07:20 AM   #289
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1988 345... The adventure begins!

One last update for today! New tires are great. I think the 8Rís ride is smoother than the 225/70s was and I like the slight increase in speed. Tires are the Goodyear 647RS. I have been cruising on cruise control at 60 mph most of the time except for much slower speeds in the New Brunswick uphills
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Old 08-12-2021, 07:46 AM   #290
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Quote:
Originally Posted by Roby466 View Post
Then Iíll tactfully educate the tech into using the pressure-temp charts and sight glass to refill and hopefully next season Iíll have AC.

The essential insight into AC that made me understand how the system
worked is this:

After the orifice the freon is liquid and enters the evaporator. The freon
liquid is at low pressure and is boiling and cold. If there is not enough
freon it will all boil away at the beginning of the evaporator coil. This
will cause the coil to ice up.

If there is too much freon the evaporator will fill up with freon liquid and
the liquid will enter the compressor. This will "slug" the compressor.
The compressor stops turning violently and the belt will slip. This
can destroy the compressor.

The correct amount of freon is where liquid is boiling everywhere
in the evaporator but only vapor leaves the evaporator coil. This
is what the temperature/pressure charts will give you. I don't
know how accurate the sight glass is.
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Old 08-13-2021, 07:16 AM   #291
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well, the winter project list continues to grow... dash AC will need to be fixed as per my previous posts but now, the roof ACs may need looking at too. Both leak through when it rains and the front one's compressor switch doesn't work anymore. I have pulled the cover and found that the heat strip had been disconnected from the switch but plugging both ends bypassing the switch doesn't turn the compressor on either... I'll dig in my diagrams and see what else may have let go but given they leak and have these issues, I may need to replace the units. More diagnostic to follow...
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Old 08-13-2021, 04:33 PM   #292
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Quote:
Originally Posted by Roby466 View Post
well, the winter project list continues to grow... dash AC will need to be fixed as per my previous posts but now, the roof ACs may need looking at too. Both leak through when it rains and the front one's compressor switch doesn't work anymore. I have pulled the cover and found that the heat strip had been disconnected from the switch but plugging both ends bypassing the switch doesn't turn the compressor on either... I'll dig in my diagrams and see what else may have let go but given they leak and have these issues, I may need to replace the units. More diagnostic to follow...

Before you replace the roof AC, look into just replacing the compressor capacitor. you will find them under a metal cover after removing the shroud. Inexpensive and easy to replace, just have to follow discharge procedure (short the terminals). Those old AC's cool real well.
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Old 08-14-2021, 06:29 AM   #293
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Good point. Iím trying to find the wiring info to do more diagnosing. I definitely prefer to not have to replace them both.
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Old 08-14-2021, 08:15 AM   #294
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Is the start capacitor on top side (access from the roof) or in the interior access side?
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Old 08-14-2021, 01:11 PM   #295
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Is the start capacitor on top side (access from the roof) or in the interior access side?
Attachment 401817

top from roof, after you pull the shroud. You will see a couple of screws holding a cover in place. Inside you have either 2 or three capacitors. One will be the compressor start capacitor. They are not polarity sensitive, but caution they may be holding a charge. Match the label as close as you can, i.e. this

https://smile.amazon.com/AEROVOX-Z50...0RW7ONR0&psc=1
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Old 08-14-2021, 01:13 PM   #296
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1988 345... The adventure begins!

Awesome. I got it started again but starting the compressor appears hard so Iíll change the capacitors when I try and seal the AC again. It appears it leaks through the inside at the moment.
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Old 08-14-2021, 02:17 PM   #297
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Awesome. I got it started again but starting the compressor appears hard so Iíll change the capacitors when I try and seal the AC again. It appears it leaks through the inside at the moment.

Leaks when it runs or rains? If when it runs, you probably have a leaky drain pan. I have fixed many of those with vulkem 112, after locating the leak, cleaning and drying the area.
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Old 08-14-2021, 02:18 PM   #298
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When it rains. Well actually once I drive away as it appears to get fought in the inside cover .
Going up there after this trip!
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Old 08-21-2021, 07:46 AM   #299
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Alright! Post first major trip report:
1709 miles, 2709 km
875 L fuel used
13 days, 12 nights
Averaged fuel consumption 9.4 mpg (30 l/100km). Corrected for not leaving with a full tank.

Only things that failed (other than AC that did not run from the start was the oil pressure sending unit, which was readily available for next to nothing and replaced in minutes, and exhaust manifold leak either returned, or started on the other bankÖ. (headers will go in this winter)

I set the cruise control just above 60mph and that gave a gps speed of about 100km/h.

Great times overall!!!
(Pic is parked by the St Lawrence River near Quebec City for the night)

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Old 08-21-2021, 08:56 AM   #300
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1988 345... The adventure begins!

one more update on the tires: I went from some quite old 225/70s to the original size 8R19.5 Goodyear G647RS. Overall they felt a bit smoother riding, no vibration, and getting in deep water on the highway felt like nothing at all while I saw cars hydroplane near me, but that could have to do with the weight of the motorhome and not the tires. They are visibly narrower than the 225s looking from the front but look better from the side filling the wheel wells a bit more.



We were loaded with 2 adults, 4 children (12 and below), and one St. Bernard dog, and we had lots of stuff we brought back from the trip.
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