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No A/C, low high side PSI, high low side PSI?
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furloops
New User
Jul 4, 2019, 6:07 AM
Post #1 of 10
(1759 views)
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No A/C, low high side PSI, high low side PSI?
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I have a 2005 Acura RL 3.5 V6 182,700 miles.
My A/C stopped about 2 months ago and have been trying to figure it out without going to a shop.
So far we found (a buddy of mine has one of those professional a/c machines) that the freon was low (0.50 pounds) so we charged it to 1.12 pounds as stated by the machine, still no go, low side stays at about 100 psi, high side stays at about 125 psi, and this is with the clutch on the compressor on and off.
So we both pretty much agreed bad compressor, roll on down to Napa (ouch) they have one, put it on, exact same thing, clutch on compressor working fine, on and off, still same pressures as before, so we replaced the expansion valve and drier filter, still nothing, lines are not getting cold, we made sure there was no blockages in the lines, condenser and evaporator (well the best we could do with a compressed air) vacuumed it for about 40 minutes, recharged it, still nothing, high side just sits there at 100, and low just sits there at 125.
Any ideas where to turn to from here?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 4, 2019, 6:26 AM
Post #2 of 10
(1755 views)
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Re: No A/C, low high side PSI, high low side PSI?
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? A system should not be able to lock a different pressure for long on high or low side, pretty much even with a complete clog or blockage.
If anyone you or operator of that machine is sure it's charged to the correct weight as you said and still behave the same it wasn't the issue to begin with. There are 100s of other reasons A/C will not work or a lot anyway. Must know there's no heat invasion, fan(s) work when they are supposed to.
You or helper really needed to inspect the old compressor and oil that could come out of it for really checking it.
At the moment is only a guess this is another issue not compressor and wasn't hope you still have the old one to inspect it for clues. That and I'm no so sure hook ups from that machine were set properly or not operating - too many variables for this it really needs some grass root checking operation of the system with a series of tests right now there's nothing you posted I can add to it's remains an unknown problem,
T
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 4, 2019, 9:43 AM
Post #4 of 10
(1746 views)
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Re: No A/C, low high side PSI, high low side PSI?
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It's tough. You really need to search out and look at a see thru or good diagram of what goes on and off INSIDE the manifold of gauges. When which is doing what of course totally matters. The connection to a port even at hose ends may not work just right either.
It stinks with my own stuff IDK last season plucked out all the tube like "O" rings used in some hose ends to seal. If new and bad no good. They could fold over somehow.
If you can afford the stuff to do this something is wrong. OMG it's costly.
Knowing what can and can't be possible help you/tech or operator of the equipment to know it's right.
Don't forget when charging a system whatever machine or way it start with a vacuum - FULL VACUUM WELL HELD! All bets off you could easily pump air into one and then the wild erratic to impossible reading happen.
It's not a forgiving sport,
T
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furloops
New User
Jul 4, 2019, 10:25 AM
Post #6 of 10
(1727 views)
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Re: No A/C, low high side PSI, high low side PSI?
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"gauge valves are both open" i don't know what that is, i will relay that to my friend that serviced it.
He did service two other cars that day with no issues, he did check the gauges on the machine after mine, but everything was working as far as i know. After finishing the other two, we went back to my car and it was doing the same thing again.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 4, 2019, 10:47 AM
Post #8 of 10
(1712 views)
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Re: No A/C, low high side PSI, high low side PSI?
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Tools, equipment now throw in probably a rebuilt compressor wild failure rates. It's a trade of its own and hours to know your tools and equipment never mind what might be wrong with a vehicle. In this case just fess up also if it wasn't working and anyone played with it before this were at least the caps put back on the service ports? They really can be damaged, inoperable.
Let your person with machine that worked on others try again. It can be done with just low port a lot of vehicle don't have a high side port at all for quite some time.
Lost for you and playing "go-between" you and who is doing this adds more confusion.
At a loss we are playing an old game called "telephone" and the message gets fouled up now so let your person figure it out,
T
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furloops
New User
Jul 4, 2019, 10:50 AM
Post #9 of 10
(1711 views)
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Re: No A/C, low high side PSI, high low side PSI?
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I did hook up the hoses to the lines and turned both open, he did everything else, the rest was controlled by the machine. My friend is a master tech of 8 years before he became a aircraft mechanic, but i don't know.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 4, 2019, 3:00 PM
Post #10 of 10
(1635 views)
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Re: No A/C, low high side PSI, high low side PSI?
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?? If you just wanted pressures you don't open the knobs at the manifold if that's what you did. At some year the law was something like a must have shut off on blue and red hose so even just the spit of 134a didn't escape.
This system holds so little (your stated system weight of charge) refrigerant being off just 2 oz. is going to really mess it up. No room for even slow hook ups some are a pest.
A "Master Tech" if you mean ASE includes Heat and A/C the principle of it didn't change the control of such a small charge has to be spot on - no mistakes there.
With that I'm just saying once known don't touch it you get spits lost this can't afford. I can't know the range of too much or little on such is the spot where it begins to be lousy or fail to cool? Just know if your info is correct I'd be done hooking up and checking temps of lines when engaged to exact spot - perhaps just me find that very useful info of what's going on right there.
If both you and your friend are messing with it back to the saying "Too many cooks in that kitchen" nothing is going to taste right. Not funny it's hot out and you want it work and be done. Not always so simple.
Start over!
Tom
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