RE: [DML] A/C pressure readings - interpretation?

["Tom Tait" <TTait@xxxxxxxxxx>]

Your main problem is that you system needs freon every spring, so it has
a leak - you need to put in a UV dye/indicator (included in some Freons)
and use a kit to find the leak(s),  or take it to a shop that has a
sniffer.  Once the leaks are repaired, then you can worry about
pressures and capacities.

 

________________________________

From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf
Of Soma576@xxxxxxx
Sent: Wednesday, April 18, 2007 6:30 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] A/C pressure readings - interpretation?

 

Hi Group,

I recently bought an R134a A/C manifold gauge set since I have two cars
with 
sketchy air conditioning systems. My DeLorean needs freon every spring
it 
seems, so I thought I might learn more about my issues by doing the work

myself instead of taking it in all the time.

Here's the details:
- stock A/C system
- R12 was purged out a few years ago and replaced with R134a and
different 
oil
- R134a service ports

I took some readings this evening, and I am hoping someone out there can

tell me what the readings SHOULD be, given my situation.

Ambient temp 65 deg F

Static A/C Test:
Low side - 3.6 bar/ 5.4 Hg (on the outside of the gauge is a scale that 
reads "R134A" and the needle was pointing to +14 on that scale - what
does that 
mean???)

High side - 6 bar/ 67 Hg +15

Performance Test
Low - 40 Hg +7
High - 122 Hg +36

I guess I should add 36 to 122 etc since the gauge has different scales
for 
different refrigerants. Is this a density adjustment or something? The 
instructions for the gauge set does not explain this.

If these readings are out of whack, what should I be shooting for, and
how 
do I obtain it (I assume I will need to add freon). I am very new to A/C

service.

Thanks for the help!
Andy

Fargo, ND 
1982 DeLorean DMC12 VIN 11596

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