Thermostat

WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.

When investigating a concern of overheating or an insufficient heater/defroster performance, perform the following:
1. Check and service any leaks found in the following:
^ pressure relief cap
^ heater water hoses
^ radiator hoses
^ water hose connection gasket
^ cylinder head
^ water pump housing gasket





2. Check the cold engine coolant level in the degas bottle.

a. If the level is below the cold fill level, fill to the cold fill level with a 50/50 mixture of Ford Extended Life Engine Coolant F6AZ-19544-AA (orange) or an equivalent DEX-COOL(R) or a coolant meeting Ford specification WSS-M971344-D and water.

b. If the coolant drops below the cold fill level, add coolant to bring level back to the cold fill level. If air is suspected in cooling system, perform Draining, Filling and Bleeding procedures.

When this procedure has been completed, feel the heater inlet and outlet hoses and the underside of the upper radiator hose. The water thermostat should be removed only if these hoses are cold after 10 minutes of operation.