Question on A/C refilling

Hello,

I have a 1996 Plymouth Voyager and the A/C was working before winter, I
suspect a small leak and was going to add a can of R-134a with the red die.
The compressor is not turning on as suspect with a low fluid level.
What I need to know is where the low-pressure cycling switch is located so I
can short it to add the can of R-134a.
Any info appreciated.

Thanks,

Greg

 

In order to properly recharge the system, you have to evacuate it
first. If your idea is to add the die to see where the leak is, then
that is not a bad idea, but you still have to properly evacuate the
system in order to service it. You should not simply open the system
and let the refrigerant out! So no matter how you slice it, you are
going to need to take it to a shop - unless of course you have all the
proper equipment.

If you add refrigerant and it mixes with the air, I hear that it gets
mildly corosive, and will eat all your seals. This could lead to major
$$$$$. So if you are doing this as a diagnostic, then fine, but it is
not a long term fix.

Just my $0.02

 

My 95 it is located on the firewall next to the T valve. Had to do the same
thing last summer with mine and worked fine.
Be sure to get the proper kit to do this and follow the directions.

 

Hi Greg,
If the system still has pressure in it you can do this. If not, as has
been mentioned, you'll need to have the system evacuated after you find the
leak. Look around the compressor pulley and around system connections for
evidence of oil. Look around the condensor for evidence of oil also. Any
oily spots would be evidence of a leak. If the system does have pressure
then try adding a can to see if it brings the pressure up enough to kick the
compressor on.

Good Luck,

Tom Heintz "Mopar Maniac"

P.S.-I can't remember where the switch is on this van. Look along the
system lines for the switch. Should be in a fairly accessible spot.

 

Without the compressor cycled on and running, the system will not accept the
contents of the can.

 

Sure it will.

 

Never has for me.

 

Tried lowering the can into a bucket of warm water?

Bill Putney
(to reply by e-mail, replace the last letter of the alphabet in my
address with "x")

 

That is why he was asking for the location of the low-pressure relay, so
that he can cycle the compressor to add a can and check for the leak
location.

 

Could you explain how, as I have never seen a system accept a (can ) charge
without the compressor cycled on.

 

creative I guess, but wouldn't be easier just to jumper the low pressure
switch to cycle the compressor?

 

if you have to ask this question there is a good chance in your life you will
blow up a 1lb can of it in your face
there is a 90 % chance the evap. coil is leaking on the van

 

No, it's called knowing how to do it.
As in; proper training.

The reason there's a low pressure switch is to protect the
compressor from lack of lubrication.
If there is insufficient refrigerant charge, there is not going
to be enough oil circulated to the compressor, if not enough oil
is being circulated, you risk damage to the compressor.

Why would you want to do that?

 

I am not talking continuous run of the compressor, simply cycling the
compressor to bring the pressure up enough to allow it to then cycle on its
own. In any case you have answered the question.

 

I would suggest when you connect your next can you use care in connecting to
the low pressure side and not the high pressure side.

 

But you're the one who wants to cycle the compressor to bring the
pressures "up" in order to add some refrigerant....

 

Hi all,

The Haynes manual Caravan/Voyage 96-99 has an article on adding a can or 2
to the low pressure side. Found in section 3-11 of the book.
I saw today on Two Guys Garage there is a tool which you can attach an can
of r-134a and connect to the low pressure side. It has a dial indicator for
Low, Correct, and High levels.
Was around $20.00 US

Thanks to everyone for their comments.


Greg

 

i have a recycling machine at work never touch any less than a 20 lb can