How to jump out low pressure switch - 1993 Chevrolet Suburban

POSIBLE LOW IN FREON OR YOU HAVE A ELECTRICAL PROBLEM

The low pressure switch would be around the air dyer system.

If line drier is cool on one side and warm on other you have a line restriction. Is compressor cycling on and off.?.. be careful jumping low pressure switch...The high pressure on low side is restriction going to evaporator coil in firewall... check for a filter in cab for evaporator coil it may be stopped up

ADD Freon. It's a R134 system and the pressure is too low. Trust me add Freon and it will work fine. With a low amount of Freon if you jump the low pressure switch at the accumulator it will be very cold but will not have enough pressure to kick on the low pressure switch.

The low pressure switch turns on appox 26 psi. If the pressure is lower than that, it wont work, you have a leak.

THE LOW PRESSURE SWITCH
SYSTEM IS PROBABLY LOW IN FREON
TO CONFIRM LOCATE LOW PRESSURE SWITCH AND JUMP
THE TWO PINS IF COMMPRESOR ENGAGES THR SYSTEM IS LOW
DONT LEAVE IT JUMP YOU WILL BLOW UP COMPRESSOR
NEEDS FREON TO CARRY COMRESSOR OIL TRUE OUT SYSTEM

turn ac on with engine running check for power at the compressor if there isnt check for power at the low pressure switch if there is jump out the connection
the compressor should turn on the low pressure switch is usually located on the accumulator canister (SILVERY CANISTER) near the firewall.

i am not sure on this vehicle but it is usually right on the compressor..

The interuptions in compressor engagement is due to low side drops which is controlled by the pressure switch mounted on the low hose or large metal accumulator on the passenger side. Low side hoses are larger and the accumulator is on the passenger side engine compartment...a paper clip works fine jumping this low side pressure switch out until freon pressures increase enough to keep compressor running to accept freon.

If you look on the low pressure side of the AC system you will see a plug that is incorporated in to the line. It will have two wires leading to it. Remove the plastic clip that attaches the two wires to the sensor and use a short piece of wire to connect the two terminals in side the plug by putting the ends into the cap. This will bypass the low pressure sensor and allow the AC clutch to engage and begin to cycle again. Remember this low pressure switch is there for a reason. If you don't add more r-134 to the system and allow the AC compressor to cycle you will destroy the compressor. You need to charge the system when you bypass the low pressure switch and get the system up to full charge status and reconnect the switch.

The A/C pressue switch may be bad as well. Also the mode switch on the control head inside the vehicle. There are many other exsisting problems pertaining to a/c. I suggest a manual from Auto Zone for many faults can be noted especially wiring can be at fault