Automotive Air Conditioning Information Forum

hi
Shellite X55,,, also called Recosol R55
essentially hydrocarbon or lighter fluid

X55 mild degreaser can be used as a pre clean wipe prior to painting
leaves no residue and 100% evaporates

Also used as automotive hydraulic brake part cleaner

After using flush blow thru with nitrogen .VS ...

hi

First look for obvious damage eg hose rub thru . Twist hose ferrules if they twist replace
Look for oil stains on all a/c parts
Has the system have leak dye

might see compressor seal vacuum fluctuation reading on a micron gauge when clutch is rotated .
or
charge with a trace of refrigerant ...

hi
R/drier will be ok a larger unit won`t hurt
Remember the system = 2.6 ton
Try and match compressor ,,evaporator txv from a known combo ,,Saves the guess work from having mismatched components
engine drive pulley diameter can be varied a little

Condenser size bigger the better . Remember to ...

hi
in hg is

29.92 = 100 microns
29.9 = 500 microns
29.88 =1000 microns
29.82 = 2500 microns
29.53 = 10,000 microns

Many industrial/commercial compressors spec below 500 microns
Anything with a shaft seal 1000 microns
Above is with pump operating

Leak decay/ vacuum rise should be little ...

hi
Besides being low on refrigerant .

Does your vehicle make/model have a cabin filter ?? If dirty change it out ,, if not the evaporator core will most likely be covered in debris . Any vehicle can have a dirty evap core as early as 60,000 miles . Some times it might be needed to drill a hole and ...

Hi
Its all about vacuum and how many microns you are are getting down to and how long you are staying there .
2 Areas
tool vacuum leaks and
evacuation setup

LEAKS ===vacuum
Buy a micron gauge
Reseal manifolds with new o rings [use silicon grease OR di-electric grease ] and flush with liquid ...

hi
Early in the am probably tired .
Experience with your own micron gauge goes along way . Once u have seen how the gauge responds to leaks of various causes eg r134a coupler or manifold o rings etc . First thing i do if gauge is not performing is to alcohol clean and retest . Once you become ...

hi
Experience of your micron gauge for small leaks eg manifold o ring leak and what u would expect to see on the gauge to represent that

hi
Tried recently to repair my old school Robin air USA made 2stage 5 cfm vac pump . Parts are no longer made . The complete alloy pump half is replaced . Considered age and I chose not to

If u buy a non USA eg china buy a 6cfm 1/2hp 2stage. The 4cfm I purchased is slow to pull down vs my old ...

hi
Always be observant when using vac pump . Look for fluctuations when operating taps .Also compare this to a new 1/4 hose with a micron gauge . If the readings are different the gauge set has a leak most likely . Vac both situations overnight to eliminate moisture as much as possible. If the ...