a/c help.

hi guys.
what is involved to flush out your a/c system? is this something i can do? any special tools? thanks for the info.
sorry, it is a 1998 venture.
thanh

It is a pain to do.
The sysyem has to be opened and a lot of lines unhooked.
You can not flush the compresser or reciever dryer.
And some condensers are very hard to flush.
Why do you want to flush it?
Or what is the problem?
MT

my a/c sometimes works great, some time not at all. i think there are rust in the system that is blocking the passage somewhere. when i take pressure reading, sometime i get 22psi when the a/c is working,other time i gat 65psi when it is not working.
thanks for the info.

Never heard of rust in an a/c system- and I've been doing them for 20 years- you beed to understand why the compressor runs sometimes and not at other times- are your coolings fan operating with the a/c requested on?

the compressor run all the time when the a/c is on. but sometimes it's real cold, sometimes it's not even cool. when it runs cold-the pressure at the low side is 22 when it run not so cool the presuure at the low side is 65, i'm thinking something is blocking a passage somewhere.
thanks

I'd suspect a faulty refrigerant control valve in the rear of the variable stroke V-5 compressor your system uses..or a sticking internal mechanism.. next time it is at 65 psi low side-- rev it up a few times- see if it starts pumping better

thanks i'll try that the next time i drive the van. let you know how it goes.

thanh

brcidd (http://www.automotiveforums.com/vbulletin/member.php?u=356995)
i tried what you said and it made no different. any thing else i can do before taking the system apart?
thanks.

thanh