Anyone know how to recharge the AC in a 91 Blazer?

[Toyrunner87]

Hey all...i have the Universal Conversion kit to swap my truck over to R134 and get some AC again but i don't know whick fitting is the High pressure and what is the low? The 2 fittings i can find one is on the aluminum can near the fire wall,,,the other is low along the fram on the passenger side and it runs from where the radiator is to the condensor...any idea/tips?

 

[ToyotaDon]

Aluminum can on firewall=Accumulator on low side of system.

Rules of thumb for A/C: High side is smaller lines between compressor/condensor/orifice tube (or expansion valve).
Low side is larger lines after evaporator core inside cabin, accumulator on GMs, and line back to compressor.

The fittings are supposed to be slightly different thread on the high side, we normally need to use an adapter with our equipment. Hopefully your kit came with the correct fitting.

You should have someone with a vacuum pump put vacuum on the system for at least 30 min. to remove any moisture before recharging.
If you need more help, make a run to Visalia.