temperature control switches. If one system is not
b. Testing.
operating properly. interchanging the like switches is a
simple test.
if the same system continues
to
(1) The heat range selector switches are rotary,
malfunction, the sensor or wiring is defective. If the
2 pole, 4 position, non-shorting switches. An ohmmeter
opposite system malfunctions instead, the switch is
check of open and closed circuits in each position may
defective.
be made to determine if switch is serviceable.
(3) Refer to the wire run chart in figure 5-45 and
(2) The air temperature control switches operate
test individual wires for continuity for the air conditioning
with the temperature sensors. Incorrect operation may
and heat control panel wire harness assembly. Lamps
be due to failure of either the switch or the sensor. As
are 24 VDC.
two conditioned air systems are used, there are two heat
temperature control switches and two cooled air
5-57
