Conversion of A/C system from R12 to R134a Retrofit:
Page 8
Inspect A/C System
A20
Vacuum pump the A/C system
Connect R134a recycling/filling unit.
Start vacuum pumping and continue for at least 50
min.
Check that system keeps a vacuum. The vacuum must not sink during a
4 min period. (This is with the vacuum turned off) The recycling/filling
unit is not required for this step. I used a standard AC vacuum from a
R12 system. and connected it to the other R12 charging port opposite the
pressostat (See arrow in the bottom picture) and ran the vacuum for the
50 min.
Finalizing work
A21
While evacuating, the following work can be carried out:
Complete the light blue rectangular R134a RETROFIT label before the
protecteive paper and carbon is removed
Using ball-point pen, note:
technician intials
dealer number, if applicable ( or repar shop name, city, state)
Date
Carefully clean off the old r12 decal on the body work, remove the carbon
paper and stick the new, light-blue R134a RETROFIT lable over it. Make
sure the old label is completely covered.
Using mineral spirits, clean top of accumulator, then stick the round
R134a RETROFIT decal on the receiver.
A22
Install the caps (included in kit) in the service valves which are
no longer used.
Two on the compressor (in sertain cases there are none on th ecompressor)
and one on the receiver (see illustration below)
Use locking fluid PN 1161351-0 or equivalent on the caps.
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