97 Caravan 3.0L A/C Questions
#1
07-10-2009, 01:25 AM
Join Date: Dec 2007
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
97 Caravan 3.0L A/C Questions
I have the 97 Caravan 3.0L car.
Doing some A/C work and wanted to know if someone can give me genaral info on what pressure I should be seeing on the low side and on the high side once I have proper amount of 134A in the system.
The A/C was working fine, but lately has lost the coldness, and I figure it needed a recharge.
It took a long time for it to get to this condition. It seemed to have leaked out through fittings on low/hi side so I replaced the o rings. Now, wanted to know what pressure I should see on the gauges on low and hi sides during A/C operation. The outside temp out here at this time of the year is about 95-100F during the day, around 90 in the evening (around 6pm).
After I put some in, I think the low side was reading about 45psi, and hi side was around 200-210psi. I read in other places that these numbers are low for both low and hi sides.
Really appreciate it. Thanks.
Doing some A/C work and wanted to know if someone can give me genaral info on what pressure I should be seeing on the low side and on the high side once I have proper amount of 134A in the system.
The A/C was working fine, but lately has lost the coldness, and I figure it needed a recharge.
It took a long time for it to get to this condition. It seemed to have leaked out through fittings on low/hi side so I replaced the o rings. Now, wanted to know what pressure I should see on the gauges on low and hi sides during A/C operation. The outside temp out here at this time of the year is about 95-100F during the day, around 90 in the evening (around 6pm).
After I put some in, I think the low side was reading about 45psi, and hi side was around 200-210psi. I read in other places that these numbers are low for both low and hi sides.
Really appreciate it. Thanks.
#2
07-10-2009, 02:05 PM
You replaced some O rings?
SO the system was open to atomsphere .....?
AFTER you used the proper equiptment to recover the refridgerant you forgot to add...
If yes then you will need to evacuate the system- pull a vacuum - checking that is holds.
Ball park. Rule of thumb, quick and easy
when the charge is NOT weighed in.
low side @35-40 high side(ambient X 2.5.) will be high end of expectation
Alsolet us know front only or front and rear
SO the system was open to atomsphere .....?
AFTER you used the proper equiptment to recover the refridgerant you forgot to add...
If yes then you will need to evacuate the system- pull a vacuum - checking that is holds.
Ball park. Rule of thumb, quick and easy
when the charge is NOT weighed in.
low side @35-40 high side(ambient X 2.5.) will be high end of expectation
Alsolet us know front only or front and rear
#3
07-10-2009, 03:34 PM
Join Date: Dec 2007
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
skipped a few steps for simplicity reasons.
to make things easy skipped the part where I replaced compressor, dryer, expansion valve, etc. For obvious reasons, when I got in there, there was nothing to 'capture'.
Now, that is a lot of explaining....lol.
Yes, evacuated system and yes it holds.
It is a front A/C only...no rear.
when you say hi side = ambient x 2.5, are you talking 2.5 x of what the low is?
Ambient pressure is 14.7psi at sea level, and I am pretty positive you are not talking about that ambient. Basically, it is 2.5 times of what ... If you could fill me in, I would appreciate it.
to make things easy skipped the part where I replaced compressor, dryer, expansion valve, etc. For obvious reasons, when I got in there, there was nothing to 'capture'.
Now, that is a lot of explaining....lol.
Yes, evacuated system and yes it holds.
It is a front A/C only...no rear.
when you say hi side = ambient x 2.5, are you talking 2.5 x of what the low is?
Ambient pressure is 14.7psi at sea level, and I am pretty positive you are not talking about that ambient. Basically, it is 2.5 times of what ... If you could fill me in, I would appreciate it.
You replaced some O rings?
SO the system was open to atomsphere .....?
AFTER you used the proper equiptment to recover the refridgerant you forgot to add...
If yes then you will need to evacuate the system- pull a vacuum - checking that is holds.
Ball park. Rule of thumb, quick and easy
when the charge is NOT weighed in.
low side @35-40 high side(ambient X 2.5.) will be high end of expectation
Alsolet us know front only or front and rear
SO the system was open to atomsphere .....?
AFTER you used the proper equiptment to recover the refridgerant you forgot to add...
If yes then you will need to evacuate the system- pull a vacuum - checking that is holds.
Ball park. Rule of thumb, quick and easy
when the charge is NOT weighed in.
low side @35-40 high side(ambient X 2.5.) will be high end of expectation
Alsolet us know front only or front and rear
#4
07-11-2009, 07:39 AM
#5
07-17-2009, 07:02 PM
Join Date: Dec 2007
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
... awesome...2.5x ambient temp (F) on the high side, and 35-40 on the low side (high end of the scale as you say).
we have been having temps of 105 for a long spell.
Looks like I need more 134a - I put in about 28oz.
Thanks for your help. Will try to do this in the next couple days - being sick to day.
Thank you.
we have been having temps of 105 for a long spell.
Looks like I need more 134a - I put in about 28oz.
Thanks for your help. Will try to do this in the next couple days - being sick to day.
Thank you.
Last edited by kevals; 07-17-2009 at 07:05 PM.
#6
07-17-2009, 08:47 PM
Hey guys, don't mean to crash your space but for temps between 90-100 you should be looking at 25-43 on the low, and 165 to 270 on the high for R134a Freon. Make sure you have a gauge manifold that you can check both sides. The cheapy low side gauges are crap. I know the range cause I just checked mine the other day. BTW I hope you evacuated and held the vacuum for at least 60 minutes at 30psi. You don't want to leave any moisture in there.
