5-6
733-554C
3. On the oil temperature switch when the oil temper-
ature reaches 160° C (320° F), the meter should
read a closed circuit.
4. On the oil temperature switch, allow the oil to
cool, and when the temperature is at (or just
before) a temperature of 140° C (284° F), the
meter should read an open circuit.
5. On the cooling fan switch when the temperature
reaches 120° C (248° F), the meter should read a
closed circuit.
6. On the cooling fan switch, allow the oil to cool,
and when the temperature is at (or just before) a
temperature of 110° C (230° F), the meter should
read an open circuit.
7. If the readings are not as indicated, the switch
must be replaced.
8. Apply thread tape to the threads of the switch; then
install the switch and tighten securely.
9. Connect the switch leads.
Coolant Temperature
and Cooling Fan
Switches
(650)
1. Connect the meter leads (selector in the OHMS
position) to the switch contacts.
2. Suspend the switch and a thermometer in a con-
tainer of cooking oil; then heat the oil.
NOTE: Neither the switch nor the thermometer
should be allowed to touch the bottom of the con-
tainer or inaccurate readings will occur. Use wire
holders to suspend switch and thermometer.
733-554E
3. On the coolant temperature switch when the oil
temperature reaches 112-118° C (234-244° F), the
meter should read a closed circuit.
4. On the coolant temperature switch, allow the oil to
cool, and when the temperature is within a temper-
ature range of 108-111° C (226-232° F), the meter
should read an open circuit.
5. On the cooling fan switch when the temperature
reaches 88° C (190° F), the meter should read a
closed circuit.
6. On the cooling fan switch, allow the oil to cool,
and when the temperature is within a temperature
range of 66° C (150° F), the meter should read an
open circuit.
7. If the readings are not as indicated, the switch
must be replaced.
8. Install the switch and tighten securely.
9. Connect the switch leads.
Engine Coolant
Temperature (ECT)
Sensor
(EFI)
1. Connect the meter leads (selector in OHMS posi-
tion) to the sensor terminals.
2. Suspend the sensor and a thermometer in a con-
tainer of cooking oil; then heat the oil.
NOTE: Neither the sensor nor the thermometer
should be allowed to touch the bottom of the con-
tainer or inaccurate readings will occur. Use wire
holders to suspend the sensor and thermometer.
! WARNING
Wear insulated gloves and safety glasses. Heated oil
can cause severe burns.
! WARNING
Wear insulated gloves and safety glasses. Heated oil
can cause severe burns.
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