Blower Motor Resistor Replacement; High Pressure Cutoff Switch - Hummer H1 Service Manual

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BLOWER MOTOR RESISTOR REPLACEMENT

Removal
1. Remove HVAC harness connector from resistor
(Figure 11-50).
2. Remove screws and resistor from cowl.
Installation
1. Fasten resistor to cowl with screws.
2. Plug HVAC harness connector into resistor.
3. Check blower motor operation.
COWL
Figure 11-50: Blower Motor Resistor Replacement
05745159
Heating/Ventilation/Air Conditioning (HVAC)
SCREWS
RESISTOR
HVAC HARNESS
CONNECTOR

HIGH PRESSURE CUTOFF SWITCH

The high pressure cutoff switch is located in the rear of the
compressor. The switch is wired in series with the compressor
clutch and exposed to high side pressure in the compressor.
Should pressure exceed the switch setting, current will be in-
terrupted to the compressor clutch until the pressures drop to
safe levels, then the switch will close allowing the clutch to en-
gage (Figure 11-51).
SNAP RING
HP
SWITCH
ORING
7-S11-054
Figure 11-51: High Pressure Cutoff Switch
11-35
COMPRESSOR
(REAR VIEW)