Another AC coolant conversion thread..

[chris989]

Originally Posted by zaccaglin

Okay so the compressor in my suburban blew last year. I bought a new one never used and will be installing it this next week. As for the coolant it is an r12 system(duh) and I plan to convert it to 134a just because I don't really want to try and find r12 for a cheap price. I just want cold air before I head to Florida. As for the conversion I know I need to buy a new accumulator/dryer and that's no biggie. As for the Everything else I found a conversion kit at the Walmart I work at, any one use it or one like it before? We also sell the coolant + oil is that the right oil I need? What about coolant after that should I buy the high mileage or just regular 134a? How much coolant will I need for an 85 burb with rear AC?

Anything else I need to buy? I do plan on having a local shop vaccine out the coolant properly.

Thanks for yalls help.
Posted via Mobile Device

make sure to flush the system before you install any new parts. I bought my flush can and solvent from Napa. just hook it to your compressor and blow the air/solvent mixture through your condenser and evaporator coils.

it is well worth it to insure there is no old oil or contaminants in the system.

AC System Flush - AutoZone Car Care - YouTube

[zaccaglin]

Originally Posted by chris989

make sure to flush the system before you install any new parts. I bought my flush can and solvent from Napa. just hook it to your compressor and blow the air/solvent mixture through your condenser and evaporator coils.

it is well worth it to insure there is no old oil or contaminants in the system.

AC System Flush - AutoZone Car Care - YouTube

Wont having the system vacuumed out, then installing the new compressor, and the new dryer be enough to clear it out?

Edit:
Just saw you included a video and watched it, i guess ill get some quotes to have a local shop do it for me.

[chris989]

Originally Posted by zaccaglin

Wont having the system vacuumed out, then installing the new compressor, and the new dryer be enough to clear it out?

Edit:
Just saw you included a video and watched it, i guess ill get some quotes to have a local shop do it for me.

i bought the flush can from napa. maybe 80$ if you have a compressor it is easy to do and not a bad tool to have in the future.

[Desert1957]

Originally Posted by zaccaglin

Wont having the system vacuumed out, then installing the new compressor, and the new dryer be enough to clear it out?

No it will not vacuum any "Junk" out.

After any component failure you have to flush out each component separately, which means breaking open all connections flushing all the parts individually (condenser,evaporator, and all lines). Blow remainder of flush solvent out, let system dry. Install NEW orifice tube, add proper amount of new style pag oil. Reassemble system, install accumulator or drier LAST (accumulator as a desiccant that starts absorbing moisture)

If you did have a "Compressor Failure" it was coming apart pumping crap all through the system before it went out completely.

During this conversion you MUST change ALL the o rings to 134 A compatible style. If not they will leak.

These are the reason for pumping your system down after it has been opened up,

*completely eliminates any air from the system
*any remaining moisture will boil into vapor and be eliminated during the process
*will partially tell you if you have any leaks,
(should hold between 28" and 30" of vacuum)

If you just replace the compressor and orifice tube , without doing the steps above it will fail again.

After you get your $1000. estimate we can walk you through doing your repair yourself for 1/2 the money.


Desert

[zaccaglin]

Originally Posted by Desert1957

No it will not vacuum any "Junk" out.

After any component failure you have to flush out each component separately, which means breaking open all connections flushing all the parts individually (condenser,evaporator, and all lines). Blow remainder of flush solvent out, let system dry. Install NEW orifice tube, add proper amount of new style pag oil. Reassemble system, install accumulator or drier LAST (accumulator as a desiccant that starts absorbing moisture)

If you did have a "Compressor Failure" it was coming apart pumping crap all through the system before it went out completely.

During this conversion you MUST change ALL the o rings to 134 A compatible style. If not they will leak.

These are the reason for pumping your system down after it has been opened up,

*completely eliminates any air from the system
*any remaining moisture will boil into vapor and be eliminated during the process
*will partially tell you if you have any leaks,
(should hold between 28" and 30" of vacuum)

If you just replace the compressor and orifice tube , without doing the steps above it will fail again.

After you get your $1000. estimate we can walk you through doing your repair yourself for 1/2 the money.


Desert

Okay we'll ill see if I can rent that flush can from someone. Not really looking into buying more tools with my move coming up.
Posted via Mobile Device

[Desert1957]

Here is just one of many flush kits, Not bad considering what you will be saving. Flush solvent is extra but be sure to use the recommended solvent.


Mastercool 91046-A Air Conditioner System Flush Kit
$42.99

Desert