Case 580SR Service Manual page 771

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SECTION 50 - CAB HEATING AND AIR CONDITIONING 11
Blower motor
The blower motor (1) can be removed by removal of
the attaching hardware and disconnection of the wir-
ing connector.
Check the blower is working, if not check fuse and
continuity of blower motor. If defective replace the
blower unit as an assembly.
Heater control valve
To service the control valve (2) disconnect the hoses
and the control cable and remove. Check the opera-
tion of the valve and if tight or worn replace.
Heater control panel
The blower motor is operated by a 3 position switch
(3) which through a variable potentiometer increas-
es or decreases voltage to the blower motor.
The heater valve is operated by a control cable
which will push or pull the valve into an open or
closed position.
Both of the above are mounted to the right of the
driver's seat and can be accessed by removal of the
control panel for repair or replacement.
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