GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Accumulator

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The factory installed air conditioning systems for vehicles covered by this guide utilize an accumulator. The accumulator serves as a storage unit for refrigerant, receiving vapors and liquid from the evaporator and is also used to purge the system of moisture like the receiver. At the bottom of the accumulator is the desiccant that acts as a drying agent for moisture that may have entered the system. An oil bleed hole is also located near the bottom of the accumulator outlet pipe in order to provide an oil return path to the compressor. The accumulator is normally found right after the evaporator in the refrigerant system. Accumulators have a great thirst for moisture and should ALWAYS be sealed to the atmosphere. Removal or installation should take place as quickly as possible in order to minimize exposure of the unit to the atmosphere.

The accumulator assembly has a service replacement kit which includes two seals for the inlet and outlet connections. The desiccant is part of the sealed accumulator assembly and is not serviced separately. Replace the accumulator only when:

  1. A physical perforation produces a leak.
  2.  
  3. The orifice screen experiences continued or repeated plugging.
  4.  
  5. An evaporator fails because of internal and external corrosion.
  6.  


CAUTION
Please refer to General Information & Maintenance of this guide before discharging/recovering the A/C system or disconnecting air conditioning lines. Damage to the air conditioning system or personal injury could result. Consult your local laws concerning refrigerant discharge and recycling. In many areas it may be illegal for anyone but a certified technician to service the A/C system. Always use an approved recovery station when discharging the air conditioning.

REMOVAL & INSTALLATION



Vehicles Through 1991
  1. Either discharge and recover the refrigerant using a suitable recovery station or have the system discharged by a professional shop.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disengage the electrical connector from the pressure switch.
  6.  
  7. Disconnect the inlet line and the evaporator outlet line at the accumulator, then immediately cap or plug both lines to help prevent system contamination.
  8.  
  9. Remove the accumulator attaching clamp and screw, then remove the accumulator.
  10.  
  11. Drain excess refrigerant into a clean container. Measure to determine how much oil needs to be added to the system.
  12.  

To install:
  1. Install the accumulator using the attaching clamp and screw.
  2.  
  3. Add 2 oz. of clean refrigerant oil PLUS an amount equal to the oil drained from the system. Use clean 525 viscosity refrigerant oil on the seals.
  4.  
  5. Install the inlet and outlet lines and tighten to 18 ft. lbs. (24 Nm).
  6.  
  7. Engage the electrical connector to the pressure switch, then connect the negative battery cable.
  8.  
  9. Either recharge the A/C refrigerant system or have the system recharged by a reputable shop.
  10.  

1992-93 Vehicles
  1. Either discharge and recover the refrigerant using a suitable recovery station or have the system discharged by a professional shop.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disconnect the evaporator from the accumulator.
  6.  
  7. Disconnect the compressor hose assembly from the accumulator.
  8.  
  9. Remove and discard the old O-rings seals. New seals should be used upon installation.
  10.  

When servicing the refrigerant system, immediately plug all openings in order to prevent system contamination.

  1. Disengage the necessary electrical connectors.
  2.  
  3. Loosen the screw and bracket, then remove the accumulator assembly.
  4.  

To install:
  1. If the accumulator is being replaced, add 3.5 fl. oz. of new 525 polyalkaline glycol (PAG) refrigerant oil to the new accumulator.
  2.  
  3. Install the accumulator using the bracket and screw.
  4.  
  5. Engage the necessary electrical connectors.
  6.  
  7. Connect the compressor hose assembly and the evaporator to the accumulator using new O-rings on the connections. Tighten the fittings to 30 ft. lbs. (41 Nm).
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Either recharge the A/C refrigerant system or have the system recharged by a reputable shop.
  12.  

 
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