I see that some people use a vacuum pump to take their a/c system into a deep vacuum, isnt that emptying the refrigerant into the air tho?
or do u have to empty the refrigerant a different way, then use the vacuum pump to create a vacuum? From what I see it is that the shops have a vacuum pump machine that pumps everything into a tank, instead of the air. If it is done that way, is the oil taken out of the system also? or is it left in there and only the vacuum empties out the refrigerant?

Any info is helpful, thanks in advance

NOTE: The usage of a a/c manifold with the pump is what im talking about<U></U>


Modified by DireFire34 at 12:32 AM 7/1/2006

 

The a/c system is vaccumed out to remove moisure and to test for leaks. They take it to 30lbs of vaccum, at 28lbs, all moisture evaporates. This is done on new installs/ repaired systems. The vaccum sucks the r134a back into the holding tank, not into the air. The oil stays in during vaccuming. Recharged my system yesterday, 22oz of r134a and I put 1/2 oz of compressor oil in, I blew an O-ring cauing my system to leak. If you dont have access to the equipment, take it to a shop that does, it doesnt cost a lot to recharge, unless the shop has high rates. I paid $1.50cnd per oz. of refrigerant.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Slothy &raquo;</TD></TR><TR><TD CLASS="quote"> The vaccum sucks the r134a back into the holding tank, not into the air. </TD></TR></TABLE>

i mean iv seen people put a vacuum on their a/c system with a vacuum like this at their own homes


doesnt that just vent all the refrigerant into the air? if that one does ill take it to a shop


Modified by DireFire34 at 8:58 AM 6/30/2006

 

anyone?


Modified by DireFire34 at 12:06 PM 6/30/2006

 

i would like to know this too, im thinking of changing some parts. What tank does that vacuum pull the refrigerant into? it looks like it just creates a vacuum and expells the 134a into the air

 

bump

 

That is not the correct way of doing it, kinda half assed. The R134a would be expelled into the atmosphere. You need a sealed vacuum unit otherwise, when you unhook it, air (moisture) will be in the a/c system again completely ruining why you vaccumed the system in the first place.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Slothy &raquo;</TD></TR><TR><TD CLASS="quote">That is not the correct way of doing it, kinda half assed. The R134a would be expelled into the atmosphere. You need a sealed vacuum unit otherwise, when you unhook it, air (moisture) will be in the a/c system again completely ruining why you vaccumed the system in the first place. </TD></TR></TABLE>

I edited my post to make more sense. Here is what I was trying to say...

if i used the manifold(shown below), hooked them up to the high and low pressure lines, I would

1.) hook the vacuum to the manifold(center yellow line), vacuum it till arond -28 to get all the moisture and refrigerant out, but would keep the oil inside the system.

and then let it sit for a while to see if there is any leaks.


Then if there is none, i fill the yellow line with refrigerant so it pushes all the air out of the hose and leave any refrigerant in there.

THen i turn my car on with the AC blowing max cold. This is when i open the lowside valve on the manifold to let the refrigerant in untill the pressure in the low side reaches 25-45?

also so if i were to use a vacuum pump like shown above, that would work to evac the system of refrigerant?

 

What do you plan on keeping the r134a in, a bottle? If so, no good, moisture penitration. The refrigrant needs to be in a sealed, airtight bottle, similar to a propane cylinder. I have never used total PSI to determine if the system is full. I've always evac'd the system and filled it to what is needed, in a civic's case, 22oz.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Slothy &raquo;</TD></TR><TR><TD CLASS="quote">What do you plan on keeping the r134a in, a bottle? If so, no good, moisture penitration. The refrigrant needs to be in a sealed, airtight bottle, similar to a propane cylinder. I have never used total PSI to determine if the system is full. I've always evac'd the system and filled it to what is needed, in a civic's case, 22oz.</TD></TR></TABLE>

i was planning on using a vacuum pump to totally evac the system through that one manifold. then i ws going to let it sit to see if there are any leaks. then i was going to put new 134a refrigerant in that i buy at the store thsts in the cans.

 

Iono, the best way I've seen is the route my friend took..

http://buy1.snapon.com/catalog...talog

Yeah, it ******* ownz a regular pump any day...

Only problem is the price, but it costs roughly $150 to do an air conditioning system so I guess it'll pay for itself within a month or two

 

lol well im looking for something a little less expensive than $4800.

Do the vacuum pumps(like the one above) have hookups for them to hookup an external tank to capture all the 134a refrigerant that comes out?