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Doug Boudreaux
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Oct 14, 2016, 5:06 PM
Post #1 of 20
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Hello all,
Pulling my hair out so I figured I'd try asking for help
1972 Chevy C10
LS swap
Oringnal Stock AC in dash, evap, new expansion, new drier, new134A (2003) truck condenser, 2003 Denso compressor, new POA up grade kit, all new lines,,,,,,
Low side 27. High 200. Coldest duct temp 58deg
Bypassed heater core
Compressor cycling like mad anything above 1500 RPM
Vacuum three times to 27"
Help
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Hammer Time
Ultimate Carjunky
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Oct 14, 2016, 8:09 PM
Post #2 of 20
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Re: Charging issues
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Locate the liquid line that goes from the condenser to the POA valve and feel the temp at idle
Is it warm to the touch, hot to the touch or room temp?
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Doug Boudreaux
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Oct 14, 2016, 8:24 PM
Post #3 of 20
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Re: Charging issues
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The liquid line coming from the bottom of the condenser goes to the expansion valve right before the evap not the POA replacement
The line coming out the evap through the POA is compressor suction
That line is about ambient
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Hammer Time
Ultimate Carjunky
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Oct 15, 2016, 4:02 AM
Post #4 of 20
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Re: Charging issues
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That indicates you have no flow in that line which indicates a blockage in the system somewhere. Suspect the dryer or the exp valve.
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Doug Boudreaux
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Oct 15, 2016, 7:06 AM
Post #5 of 20
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Re: Charging issues
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Both parts are new
In fact this is a second expansion, because of the same thinking
Evap has been removed and flushed
Shop air blown through as well
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Hammer Time
Ultimate Carjunky
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Oct 15, 2016, 7:09 AM
Post #6 of 20
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Re: Charging issues
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Are you sure you're giving it the correct charge?
The bottom line is the temp of that line indicates no flow and you need to find out why.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Oct 15, 2016, 7:10 AM)
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Doug Boudreaux
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Oct 15, 2016, 7:11 AM
Post #7 of 20
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Re: Charging issues
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I agree
The line past the POA replacement get colder if that makes sense
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Doug Boudreaux
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Oct 15, 2016, 7:14 AM
Post #8 of 20
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Re: Charging issues
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Could the evap be holding oil on the lower end causing restriction
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Hammer Time
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Oct 15, 2016, 7:15 AM
Post #9 of 20
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Re: Charging issues
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That doesn't help much. That liquid line should be warm to the touch if everything is operating properly.
If it has a sight glass, that may help you diagnose things.
The other concern you have is that I assume you are using R134A in a system engineered for R12. Not all retrofits work well.
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Doug Boudreaux
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Oct 15, 2016, 7:21 AM
Post #10 of 20
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Re: Charging issues
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Liquid line gets a bit hot, but I'm extreme south Louisiana with ?100% humited on a good day
Sight glass (on drier) shows flow. Not milky
I know I'm mis matching parts, but the only mechanical part is the expansion valve. I've done these conversions before with no issues.
This may help. Compressor run steady at idel speed, but cycles every second when you increase rpm
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Doug Boudreaux
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Oct 15, 2016, 7:34 AM
Post #12 of 20
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Re: Charging issues
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Lol
High pressure line from drier to expansion to evap
Get hot before exp, cold after
Discharge/suction/low coming out of evap is ambient
This would tell me restriction in evap, but it's been flushed and blown trough
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Hammer Time
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Oct 15, 2016, 7:39 AM
Post #13 of 20
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Re: Charging issues
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That changes everything. A hot liquid line means it's not condensing for some reason. Check the condenser and fans. The original R12 condenser may not be large enough for R134.
If you're relying on the original fan clutch, that probably isn't enough. You might consider an electric fan.
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Doug Boudreaux
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Oct 15, 2016, 7:41 AM
Post #14 of 20
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Re: Charging issues
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New 134a condenser from a 2003 Chevy truck
Electric cooling fans
One set to come on with compressor second on engine temp
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Hammer Time
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Oct 15, 2016, 7:45 AM
Post #15 of 20
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Re: Charging issues
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I don't know if you are reading your high pressure before or after the condenser but you could be dealing with a very high pressure before the condenser. That would explain the compressor cycling. I have seen discharge hoses rupture internally and act like that. You don't see the high pressure because you are reading it after the obstruction.
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Doug Boudreaux
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Oct 15, 2016, 7:48 AM
Post #16 of 20
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Re: Charging issues
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Tap is about 2" before the exp valve after the cond
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Hammer Time
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Oct 15, 2016, 7:56 AM
Post #17 of 20
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Re: Charging issues
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That's what I was pointing out. It's not reading pressure before the condenser.
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Doug Boudreaux
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Oct 15, 2016, 8:13 AM
Post #18 of 20
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Re: Charging issues
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That is on the outgoing line from the condenser
Actually at the furthes point it can be.
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Doug Boudreaux
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Oct 15, 2016, 8:15 AM
Post #19 of 20
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Re: Charging issues
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Also, would that not cause low side to be high
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Hammer Time
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Oct 15, 2016, 8:47 AM
Post #20 of 20
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Re: Charging issues
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No, not if there is insufficient refrigerant moving.
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