REV C
Section 4 • Repair Procedures
4 - 34 GS-3384 Part No. 82259
September 2005
ENGINES
4-5
Coolant Temperature and
Oil Pressure Switches -
Ford Models
The engine coolant temperature switch is a
normally open switch. The switch contacts close at
approximately 230
o
F / 110
o
C. If the coolant
temperature rises above the switch point, the
switch contacts close and the engine will shut off to
prevent damage. The engine will not start until the
temperature drops below the switch point.
The engine oil pressure switch is a normally closed
switch. The switch contacts open at approximately
8 psi / 0.55 bar. If the oil pressure drops below the
switch point, the switch opens and the engine will
shut off to prevent damage.
How to Remove the
Coolant Temperature and
Oil Pressure Switches
Burn hazard. Contact with hot
engine fluids or components may
cause severe burns.
Perform this procedure with the
engine off.
1 Release the latches on the engine tray and fully
slide the engine tray out.
2 Insert a 6 inch / 15 cm screwdriver or rod into
the engine tray lock hole located on the tank
side of the engine tray to prevent the engine
tray from moving.
3 Locate the oil pressure or coolant temperature
switch.
a oil pressure switch
b coolant temperature switch
(hidden from view)
4 Tag and disconnect the wiring from the desired
switch. Remove the switch from the engine
block.
5 Install and tighten the new switch. Torque to
specification.
6 Connect the wires to the new switch.
Always use pipe thread sealant
when installing a sending unit.
Coolant temperature switch specifications
Torque 8-10 ft-lbs
11-14 Nm
Hex size
13
/16 inch
Temperature switch point 230°F
110°C
Oil pressure switch specifications
Torque 8-10 ft-lbs
11-14 Nm
Hex size 1
1
/16 inches
Oil pressure switch point 8 psi
0.55 bar
b
a
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