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Workman MDX--D
Electrical System
Page 5 -- 1 8
Over Temperature Switch
The over temperature switch is located on the engine
thermostat housing near the alternator (Fig. 24). If the
engine coolant temperature r eaches 230
o
F(110
o
C)
(approximate), the over temperature switch closes
which causes the dash panel engine temperature light
to comeon.Theovertemperature switchhas agray wire
connected to it.
Switch Testing
Make sure engine is cool before removing the
temperature switch.
CAUTION
1. Park vehicle on a level surface, stop engine, apply
parking brake and remove key from ignition switch.
Raise and support cargo box t o allow access to engine.
2. Lower coolant level in the engine and remove the
over temperature switch.
3. Put switch in a container of oil with a thermometer
and slowly heat the oil (Fig. 25).
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
4. Check continuity of the switch with a multimeter
(ohms setting). The over temperature switch is normally
open and should close between 225
o
to 235
o
F(107
o
to
113
o
C).
5. Replace switch if necessary.
6. After testing, install over temperature switch to the
engine housing.
A. Clean threads of housing and switch thoroughly.
Apply thread sealant to the threads of the switch.
B. Thread temperature switch into the housing and
tighten.
C. Connect wire harness connector to over temper-
ature switch.
7. Fill engine cooling system. Lower and secure cargo
bed.
1. Thermostat housing 2. Temperature switch
Figure 24
1
2
Figure 25