Best practice radiator flush and fill

The radiator cap should be removed only when the engine is at full operating temperature.

• True

• False

When performing a coolant drain and flush the heater tap must be turned to the ON position.

• True

• False

Most manufacturers recommend that cooling systems should be drained, flushed and filled every_________.

• Five years

• Never

• six months

• Two to Four years

Used coolant cannot be poured down the drain or into a sewer or storm water drain, and must be reclaimed or recycled

• True

• False

To drain a cooling system that does not have a petcock or drain plug in the radiator you should:

• Remove the heater return hose

• Disconnect the water pump inlet hose

• Remove the coolant temperature sensor

• Disconnect the lower radiator hose

The petcock valve is generally located__________.

• At the bottom of the heater core

• At the bottom of the radiator

• All answers are correct

• At the base of the thermostat housing

The best way to prevent airlocks occurring when performing a coolant drain, flush and refill is by:

• Removing the heater hoses on refill

• Pressure filling the system

• Using a vacuum fill method

• Only draining the radiator and not the engine

A typical recommended mixture of Water and Antifreeze is ________.

• 40:60

• 50:50

• 60:40

• 20:80

If the coolant shows any sign of deterioration, or it has failed through strip, hydrometer or multimeter testing, then it needs replacement.

• True

• False

Chemical flush solutions are fine to use if they are compatible with the materials used in the construction of the vehicles cooling system.

• True

• False