flushing AC system for R134 conversion
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,143
Likes: 195
From: Englewood FL
flushing AC system for R134 conversion
Another post asks what is involved in R12 to R134 conversion. No one
mentioned flushing the system. I thought you needed to
spray a flushing solvent in the lines, evaporator and condensor and then
use an air hose to force the solvent out. After this step, then a
vacume would be applied.
Is the flushing needed?
mentioned flushing the system. I thought you needed to
spray a flushing solvent in the lines, evaporator and condensor and then
use an air hose to force the solvent out. After this step, then a
vacume would be applied.
Is the flushing needed?
Race Director
Joined: Apr 1999
Posts: 15,146
Likes: 477
From: NM
Re: flushing AC system for R134 conversion (mark79,80)
Mark,
My thought is that if you are going to do it, then do it right. That would mean flushing the system to get all the old oil out. If you don't it will pool up in the low spots and decrease the cooling capacity as all of the condensor and evaporator would not be available. Also change the o-rings and replace the dryer. Then you are ready for pulling a vacuum on it to look for leaks.
tom...
[Modified by Tom73, 9:29 PM 7/22/2002]
My thought is that if you are going to do it, then do it right. That would mean flushing the system to get all the old oil out. If you don't it will pool up in the low spots and decrease the cooling capacity as all of the condensor and evaporator would not be available. Also change the o-rings and replace the dryer. Then you are ready for pulling a vacuum on it to look for leaks.
tom...
[Modified by Tom73, 9:29 PM 7/22/2002]
Racer
Joined: Jul 2001
Posts: 264
Likes: 0
From: Maricopa AZ
Re: flushing AC system for R134 conversion (Tom73)
Mark,
My thought is that if you are going to do it, then do it right. That would mean flushing the system to get all the old oil out. If you don't it will pool up in the low spots and decrease the cooling capacity as all of the condensor and evaporator would not be available. Also change the o-rings and replace the dryer. Then you are ready for pulling a vacuum on it to look for leaks.
]
My thought is that if you are going to do it, then do it right. That would mean flushing the system to get all the old oil out. If you don't it will pool up in the low spots and decrease the cooling capacity as all of the condensor and evaporator would not be available. Also change the o-rings and replace the dryer. Then you are ready for pulling a vacuum on it to look for leaks.
]
Blow the lines out before you use the solvent. There is a good amount of oil left after taking off the dryer in the condensor and evapertor. :yesnod:
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Re: flushing AC system for R134 conversion (mark79,80)
Flushing seems to create more problems than it solves. You may get oil out but then you have the flushing agent to contend with. The liquid flush sold today does NOT eveporate and is very difficult to get out. The old R-11 flush is fine butI haven't seen that for a few years. Just remove the oil from the compressor and replace the drier. That will get most of the old oil. As long as you use ESTER oil you will be fine.
Team Owner
Joined: Feb 1999
Posts: 34,454
Likes: 665
From: Republic of Texas
Re: flushing AC system for R134 conversion (silvervetteman)
For what it's worth I seen O'Reilly Auto Parts had a sale on the conversion kit. It's regular $39.99, on sale for $36.99. The kit contains all the fittings, hoses, and two large cans of 134a and oil. :cheers:
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,143
Likes: 195
From: Englewood FL
Re: flushing AC system for R134 conversion (mark79,80)
Thanks for the answers.
Any problem with using a blow gun from an air compressor to
blow out the lines, condensor and evaporator? I realize that
some water vapor may be introduced but that should
be removed by the vacume pump.
Any problem with using a blow gun from an air compressor to
blow out the lines, condensor and evaporator? I realize that
some water vapor may be introduced but that should
be removed by the vacume pump.
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Re: flushing AC system for R134 conversion (mark79,80)
That is not a problem IF .... You have a vacuum pump that wil pull a vacuum of 28"hg ore more... You must also leave the pump running for a few hours to get all of the moisture. Also blow the air through a water seperator before it goes into the system. These are available at auto body supply places for the air line right at the spray gun and are cheap. :cool:
