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Totally frosted lines... how do I correct?

K_Watson on Mon July 13, 2009 9:28 PM User is offline

Year: 1998
Make: Chevy
Model: Prizm
Engine Size: 1.8
Refrigerant Type: R134
Ambient Temp: low 80's
Country of Origin: United States

Hi everyone!

I'm fairly new to A/C but I know this is not normal... (was driving around town for an hour)





My A/C was non functional for at least 2 years, until Friday when I flushed the condenser and evaporator with denatured alcohol, and replaced the compressor, accumulator, orifice tube, and various o-rings. I charged the system with what should have been proper amount of oil (8oz PAG 150) and refrigerant (26 oz) and the pressures were "perfect" according the the retired A/C tech that helped me.

What could be wrong?

Is it undercharged? Over charged? Not cycling?

Edited: Mon July 13, 2009 at 9:31 PM by K_Watson

JJM on Tue July 14, 2009 2:46 AM User is offline

At least you've got plenty of cooling capacity to ice everything up.

Your V5 isn't destroking, so either the compressor control valve is bad, or the linkage is sticking or hung up. You should also clean the evaporator coil, to ensure maximum airflow and heat absorption.

Joe

When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com



GM Tech on Tue July 14, 2009 8:07 AM User is offline

If you failed to pull a proper vacuum before charging- this is the result-- air in the system fools the compressor into not destroking...I once had a unit with 17 degf vent temps- the owner did not think a vacuum was necessary... V-5 systems are prone to freeze-up with air in the system..

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

K_Watson on Tue July 14, 2009 10:07 AM User is offline

Quote
Originally posted by: GM Tech
If you failed to pull a proper vacuum before charging- this is the result-- air in the system fools the compressor into not destroking...I once had a unit with 17 degf vent temps- the owner did not think a vacuum was necessary... V-5 systems are prone to freeze-up with air in the system..

Can I just recover the r134, evac it again and recharge, or do I have to do everything over again?

daman on Tue July 14, 2009 11:57 AM User is offlineView users profile

Did you pull a vacuum and charge into that vacuum????

if no control valves are bad just reclaim and recharge factory amount into a vacuum.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

mk378 on Tue July 14, 2009 3:11 PM User is offline

If you did use a vacuum pump before charging, measure pressures again and if the low side goes below about 20, there's a problem with the variable compressor. Note that variable displacement compressor systems are designed not to cycle in normal operation, the compressor varies internally instead.

Also you need to have plastic caps on the service ports, both to keep dirt out and prevent leaks.

Edited: Tue July 14, 2009 at 3:12 PM by mk378

K_Watson on Tue July 14, 2009 5:40 PM User is offline

A vacuum pump was used for 15 min, after sitting for 10 min, gauge still read 29 In Hg.

I drove around again today and the problem did not appear, but I did add a small amount more R134a late last night (can gauge read 33psig), and it is a little warmer out than when the picture was taken. Still blowing 40 degrees at the vents.

Edited: Tue July 14, 2009 at 5:48 PM by K_Watson

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