Hummer H1 Service Manual page 740

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RECEIVER/DRYER REPLACEMENT
Removal
WARNING: Air conditioning system components are
subject to high-pressure R-134a gas. Always discharge
pressure and contain refrigerant using approved service
equipment. Use extreme care when handling R-134a.
Direct contact with skin may cause frostbite. Do not
smoke in areas where R-134a is stored or used. Failure
to follow these warnings may result in serious injury.
NOTE: The receiver/dryer will quickly absorb water from the
atmosphere when not sealed. Do not leave system open during
service. Receiver/Dryer should be replaced any time major
components are replaced. If in doubt, replace unit.
1. Discharge air conditioning system.
2. Disconnect electrical connector from high/low pressure
switch (Figure 11-15).
NOTE: Cover all open lines to prevent contamination.
3. Disconnect two hoses from receiver/dryer and remove O-
rings. Discard O-rings.
4. Remove two clamps and receiver/dryer from bracket.
O-RINGS
HOSE
RECEIVER
CLAMPS
DRYER
Figure 11-15: Receiver/Dryer
Installation
1. Secure receiver/dryer to bracket with two clamps. Position
hose attachment ports to front and rear of vehicle
(Figure 11-15).
2. Lubricate two O-rings with PAG oil and position on hose
fittings.
3. Connect two hoses to receiver/dryer.
4. Connect electrical connector to high/low pressure switch.
5. Test the system for leaks.
05745159
Heating/Ventilation/Air Conditioning (HVAC)
CONNECTOR
HOSE
HIGH/LOW
PRESSURE SWITCH
BRACKET
RECEIVER/DRYER PRESSURE SWITCH
REPLACEMENT
Removal
1. Disconnect pressure switch jumper connector from
receiver/dryer pressure switch (Figure 11-16).
NOTE: Unscrew the pressure switch as quickly as possible to
avoid excessive loss of refrigerant.
2. Using a wrench, remove the pressure switch from the
receiver/dryer.
RECEIVER/DRYER
PRESSURE SWITCH
Figure 11-16: Receiver/Dryer Pressure Switch
Mounting
Installation
1. Thread the new pressure switch on the receiver/dryer fit-
ting by hand and use a wrench to finish securing the pres-
sure switch. (Figure 11-16).
NOTE: Install the pressure switch as quickly as possible to
avoid excessive loss of refrigerant.
2. Connect the pressure switch jumper electrical connector to
the pressure switch.
3. Check the pressure switch fitting for leaks using suitable
leak-testing equipment.
11-21
RECEIVER/DRYER
ELECTRICAL CONNECTOR
RECEIVER/
DRYER