SkyTrak 6042 Service Manual - Manual (Page 495)

9.125 Model 6042 Legacy Origin 7/02
Electrical System
9.15.11 Engine Coolant High Temperature
Switch
The engine coolant high temperature switch
(Fig. 9-118, 1) is threaded into the engine block (2) and is
connected to the operator’s instrument cluster via the en-
gine wiring harness, bulkhead connector and cab wiring
harness.
Figure 9- 118 Engine Coolant Temperature Switch
When the engine coolant temperature exceeds normal
operating limits and rises above 210° F (99° C), the
contacts close within the switch. The operator’s
instrument cluster indicator (Fig. 9 -119, 1) illuminates.
When the engine coolant temperature is below 210° F
(99° C), the contacts within the switch open and the in-
strument cluster indicator turns OFF. (Refer to Section
9.9.2, “Engine Coolant Temperature Warning Indicator
Troubleshooting.”)
a. Engine Coolant High Temperature Switch Removal
1. Disconnect the negative (–) battery cable at the
negative battery terminal (Fig. 9-117, 1).
2. Unplug the engine coolant high temperature switch
connector (Fig. 9-118, 3) from the wiring harness
connector.
3. The switch (Fig. 9-118, 1) is threaded into the
engine block (2). Remove the switch.
Figure 9- 119 Engine High Coolant Temperature Indicator
b. Engine Coolant High Temperature Switch
Disassembly
DO NOT disassemble the switch. Replace a defective or
faulty switch.
c. Engine Coolant High Temperature Switch
Inspection and Replacement
Inspect the switch and the wiring harness connector
terminals for continuity. Replace a defective or faulty
switch with a new part.
d. Engine Coolant High Temperature Switch
Installation and Testing
1. Thread the engine coolant high temperature switch
(Fig. 9-118, 1) into the engine block (2) snugly, then
connect the switch connector (3) to the wiring harness
connector.
2. Connect the negative (–) battery cable to the
negative (–) battery terminal (Fig. 9-117, 1).
3. Check for proper coolant level.
4. Clear the area around the vehicle of personnel and
any obstructions to vehicle travel.
5. Start the engine, allow it to reach operating
temperature and observe the operator’s instrument
cluster for warning indication. If the switch is not
defective, the problem could be elsewhere; possibly
in a shorted wire, improper-running engine, improper
or low coolant, obstructed or faulty radiator, coolant
pump, loose fan belt, defective instrument cluster,
etc.
MA9010
3
1
2
0000 00
P
MA7570
1