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Old 06-01-2020, 04:28 PM   #1
kyote
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Default The Royal Flush for the AC system

Going to attempt a full on flush, new compressor, drier, tvx on my 1983.
I know it's not the "hottest" system but as my uncle bumble**** says you gotta piss with the cock ya got.

I changed some dirty oil out of the Diesel Kiki, threw in a new drier, sucked it down and shot it up with duster. Couldn't get acceptable vent temps, suspect the compressor is shot, so I'm replacing it all, and flushing what I can't.

Questions:
1. Must I remove the evaporator to flush? Can I flush from the hose at the drier?
2. Is 7.5 turns out the right tvx adjustment for 134a? How about for duster/152a?
3. Should I even **** with the TVX?
4. Any gains to be had with an aftermarket universal parallel flow condenser? Or will I not see benefit without replacing the evaporator? Is there a better evaporator available? (other than the unobtanium retrofit from Volvo)
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Old 06-01-2020, 05:14 PM   #2
Cwazywazy
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Get a cheapy ebay AC manifold before you call the compressor bad. Definitely screw with the expansion valve, the stock (3 or 3.5 turns?) R12 setting won't get you adequately chilly if you're using anything but R12. I wouldn't screw with the evaporator if it's not leaking, but since you're in texas a parallel flow one might be a good idea.

Dunno about flushing the system, not sure if you'd really be able to with the expansion valve in place.
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Old 06-01-2020, 06:09 PM   #3
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I've got a manifold, vac pump, and all the goodies.
Compressor oil had quite a bit of black floating in it.
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Old 06-01-2020, 09:35 PM   #4
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remove dryer and ditch for a new one. Flush from there. Use compressed air to get rid of whatever moister is in lines. Let sit for a while and suck down. I use compressor oil on all my oil rings for a good seal. Just do it already
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Old 06-01-2020, 09:49 PM   #5
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Already did it once, half ass, now going to try it whole assed. I miss you Aron hope you're doing well my dude!
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Old 06-01-2020, 09:54 PM   #6
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Quote:
Originally Posted by kyote View Post
Already did it once, half ass, now going to try it whole assed. I miss you Aron hope you're doing well my dude!
I recommend adding a Ls engine. Makes for a better a/c
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Old 06-02-2020, 10:50 AM   #7
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I do have a 4.8 in the garage, in a Cressida? Real Volvos have 8 Valves ;)
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Old 06-03-2020, 10:39 AM   #8
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Interesting... I didn't realize that the TXV was adjustable. I thought it was a set calibration. I might have to see where mine is set now. I have an old receipt from a Volvo dealer saying that the system was converted, so I hope that was part of the process!
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Old 06-06-2020, 11:41 PM   #9
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Well, went to dump the charge and found a line had blown, no charge. So went full nuclear and ordered a new parallel flow condenser, all rubber hoses, a hydraulic ac hose crimper, some new fittings, and envirosafe refrigerant. That combined with the new sanden style compressor, receiver drier, and txv and hopefully we will have a system that satisfies.
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Old 06-07-2020, 08:47 PM   #10
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Nice! When I bought my 93 back in 05. I replaced all that except the condenser since it was the correct one for 134a. I had to replace the pusher fan too as that had failed and seized. If you don't have a pusher fan I'd definitely add that as well.
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Old 06-07-2020, 09:32 PM   #11
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Yes I think I may have one somewhere. In my 91 the only time I needed condenser fan was in a drive through or at a train in summertime. That was with duster and a parallel flow condenser but I was less than thorough with that system.

Doubt there's a fan that can move 65mph of cfms.
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Old 06-08-2020, 12:31 PM   #12
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Did you order fittings and hose locally or online? I would love to hear if everything works out and copy the setup. I am starting from scratch as I ripped everything out when I was young and dumb in 2005.
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Old 06-08-2020, 12:37 PM   #13
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Quote:
Originally Posted by holtzboy View Post
Did you order fittings and hose locally or online? I would love to hear if everything works out and copy the setup. I am starting from scratch as I ripped everything out when I was young and dumb in 2005.
I did the same in 06 to my 242, like an idiot, like a kid
Please note my hose lengths as ordered have excess added for posterity.
I ordered from ColdHose for the hose and fitting parts, amazon for the crimper and butyl type tape. Compressor, reciever drier, txv, envirosafe refrigerant from ebay.
Shopping list from coldhose attached, in your case you would want to order all fittings needed, the ferrules are for reusing the original fittings in some locations.
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