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

Hi Andy,

Today I have visited my A/C man and he dug up the information he 
jotted down while changing my car's A/C to R134a.
I wrote an article "for dummies" as they call it in the IT business 
which now is at his for review and comment.

I extracted the information on pressure and this should guide you 
through the motions:

Check: pressurize the system at 12 Bar and leave it so for 24 hours.
Then check: using soapy water to find leaking connection/seals.
Replace orifice and suspicious seals first
Add the special oil from the service kit, R134a (960 gram) and fluor 
(for easy detection of future leaks).
Run the engine stationary for 8-10 minutes to optimize spreading the 
Test at 1500 RPM with open window (one will do).

Pressure values:
Low pressure: between 1 and 2 Bar, my car's value for reference: 1.7 
High pressure: 8 Bar.

According to what I have been told there is little difference between 
the pressures of R12 and R134a, when compared under equal conditions. 
R12 tends to have a lower temperature than R134a when comparing at 1 
Bar. The difference is some 1 or 2 degrees Celsius, nothing to worry 
Remind that fluid and gas pressure increases when temperature 
increases, the same goes for lower temperatures. Therefore it's hard 
to compare pressure figures if outside temperature and outside air 
pressure (1 Bar at sea level) are not provided.

Should you be interested in the full article I can post a copy as 
soon as review has been completed and translation can be made.


--- In dmcnews@xxxxxxxxxxxxxxx, Soma576@... wrote:
> Hi Joe,
> If you could get me the pressure readings, that would be extremely  
> I am considering just evacuating the system and filling with R12  
again.  Is 
> that feasible?  Will I need to replace a bunch of stuff to  get it 
work right 
> again?  
> Andy
> Fargo, ND  
> 1982 DeLorean DMC12 VIN 11596
> ************************************** See what's free at 
> [Non-text portions of this message have been removed]

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