[DML] A/C pressure readings - interpretation?

[Soma576@xxxxxxx]

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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