REV CSection 4 • Repair Procedures4 - 34 GS-3384 Part No. 82259September 2005ENGINES4-5Coolant Temperature andOil Pressure Switches -Ford ModelsThe engine coolant temperature switch is anormally open switch. The switch contacts close atapproximately 230 o F / 110 oC. If the coolanttemperature rises above the switch point, theswitch contacts close and the engine will shut off toprevent damage. The engine will not start until thetemperature drops below the switch point.The engine oil pressure switch is a normally closedswitch. The switch contacts open at approximately8 psi / 0.55 bar. If the oil pressure drops below theswitch point, the switch opens and the engine willshut off to prevent damage.How to Remove theCoolant Temperature andOil Pressure SwitchesBurn hazard. Contact with hotengine fluids or components maycause severe burns.Perform this procedure with theengine off.1 Release the latches on the engine tray and fullyslide the engine tray out.2 Insert a 6 inch / 15 cm screwdriver or rod intothe engine tray lock hole located on the tankside of the engine tray to prevent the enginetray from moving.3 Locate the oil pressure or coolant temperatureswitch.a oil pressure switchb coolant temperature switch(hidden from view)4 Tag and disconnect the wiring from the desiredswitch. Remove the switch from the engineblock.5 Install and tighten the new switch. Torque tospecification.6 Connect the wires to the new switch.Always use pipe thread sealantwhen installing a sending unit.Coolant temperature switch specificationsTorque 8-10 ft-lbs11-14 NmHex size 13/ 16 inchTemperature switch point 230°F110°COil pressure switch specificationsTorque 8-10 ft-lbs11-14 NmHex size 11 / 16 inchesOil pressure switch point 8 psi0.55 barba
