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Charging issues


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Doug Boudreaux
User

Oct 14, 2016, 5:06 PM

Post #1 of 20 (334 views)
Charging issues Sign In

Hello all,
Pulling my hair out so I figured I'd try asking for helpBlushBlush

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


Hammer Time
Ultimate Carjunky / Moderator
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Oct 14, 2016, 8:09 PM

Post #2 of 20 (318 views)
Re: Charging issues Sign In

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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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.



Doug Boudreaux
User

Oct 14, 2016, 8:24 PM

Post #3 of 20 (311 views)
Re: Charging issues Sign In

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


Hammer Time
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Oct 15, 2016, 4:02 AM

Post #4 of 20 (306 views)
Re: Charging issues Sign In

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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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.



Doug Boudreaux
User

Oct 15, 2016, 7:06 AM

Post #5 of 20 (294 views)
Re: Charging issues Sign In

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


Hammer Time
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Oct 15, 2016, 7:09 AM

Post #6 of 20 (292 views)
Re: Charging issues Sign In

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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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)


Doug Boudreaux
User

Oct 15, 2016, 7:11 AM

Post #7 of 20 (289 views)
Re: Charging issues Sign In

I agree

The line past the POA replacement get colder if that makes sense


Doug Boudreaux
User

Oct 15, 2016, 7:14 AM

Post #8 of 20 (287 views)
Re: Charging issues Sign In

Could the evap be holding oil on the lower end causing restriction


Hammer Time
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Oct 15, 2016, 7:15 AM

Post #9 of 20 (286 views)
Re: Charging issues Sign In

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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Doug Boudreaux
User

Oct 15, 2016, 7:21 AM

Post #10 of 20 (282 views)
Re: Charging issues Sign In

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


Hammer Time
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Oct 15, 2016, 7:25 AM

Post #11 of 20 (278 views)
Re: Charging issues Sign In


Quote
That line is about ambient



Quote
Liquid line gets a bit hot,



OK, which is it?

Bad info gets bad answers.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Doug Boudreaux
User

Oct 15, 2016, 7:34 AM

Post #12 of 20 (273 views)
Re: Charging issues Sign In

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


Hammer Time
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Oct 15, 2016, 7:39 AM

Post #13 of 20 (268 views)
Re: Charging issues Sign In

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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Doug Boudreaux
User

Oct 15, 2016, 7:41 AM

Post #14 of 20 (264 views)
Re: Charging issues Sign In

New 134a condenser from a 2003 Chevy truck

Electric cooling fans
One set to come on with compressor second on engine temp


Hammer Time
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Oct 15, 2016, 7:45 AM

Post #15 of 20 (260 views)
Re: Charging issues Sign In

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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Doug Boudreaux
User

Oct 15, 2016, 7:48 AM

Post #16 of 20 (257 views)
Re: Charging issues Sign In

Tap is about 2" before the exp valve after the cond


Hammer Time
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Oct 15, 2016, 7:56 AM

Post #17 of 20 (255 views)
Re: Charging issues Sign In

That's what I was pointing out. It's not reading pressure before the condenser.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Doug Boudreaux
User

Oct 15, 2016, 8:13 AM

Post #18 of 20 (251 views)
Re: Charging issues Sign In

That is on the outgoing line from the condenser
Actually at the furthes point it can be.


Doug Boudreaux
User

Oct 15, 2016, 8:15 AM

Post #19 of 20 (249 views)
Re: Charging issues Sign In

Also, would that not cause low side to be high


Hammer Time
Ultimate Carjunky / Moderator
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Oct 15, 2016, 8:47 AM

Post #20 of 20 (245 views)
Re: Charging issues Sign In

No, not if there is insufficient refrigerant moving.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.







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