A commonly overlooked item when troubleshooting the cooling system is the radiator pressure/expansion tank
cap. The cooling system is designed to use a pressure cap to prevent boiling of the coolant. An incorrect, damaged,
or malfunctioning cap can result in the loss of coolant and in an engine overheat condition. Refer to the OEM service
manual.
An incorrect or malfunctioning cap can also result in the loss of coolant and in an engine overheat condition.
Pressure test the radiator cap. Refer to the OEM service manual.
The pressure cap must seal within 14 kPa [2 psi] of the value stated on the cap, or it must be replaced.
