ch 17

A refractometer is used to test: coolant pH. the freeze protection of the coolant . electrolysis. coolant level.

the freeze protection of the coolant

Draining and refilling the coolant is necessary in all of the following cases except when: a customer requests it. the pH is out of specification. the coolant is contaminated .the coolant level is low.

.the coolant level is low.

Tech A says that when replacing cooling system hoses, it may be best to slit the hose rather than trying to twist it off. Tech B says that cooling system hoses only need to be changed when they start leaking. Who is correct?

Tech a

Tech A says that one coolant test is a coolant electrolysis test. Tech B says that a thermostat that is stuck open will cause the engine to run cooler than it should. Who is correct?

both

Tech A says that the radiator cap should be pressure tested as part of a cooling system diagnosis. Tech B says that the water pump weep hole could be the source of a coolant leak. Who is correct?

both

Two technicians are discussing cooling system hose replacement. Tech A says to make sure that the hose clamps get installed just inside the flared or barbed segment of the fitting, not on top of it. Tech B says that it is good practice to install new hose clamps at the same time as new hoses. Who is correct?

both

All of the following should be checked for coolant leaks when pressure testing a cooling system except: Soft plugs. Heater core. Thermostat housing. clutch fan.

clutch fan

If the vehicle only overheats while stopped, it is likely an issue with the: heater core. thermostat. cooling fan. coolant.

cooling fan

A borescope is used: for examining internal passages for evidence of a coolant leak. to check belt tension .to check the temperature of air exiting the heating ducts .to activate the cooling fan through bidirectional controls.

for examining internal passages for evidence of a coolant leak.

The engine's operating temperature can be verified using all of the following except a: dash gauge. refractometer .scan tool. temperature gun.

refractometer

Tech A says that coolant leaks can be located by performing a pressure test on the system. Tech B says that when pressure testing the cooling system, you should pressurize it to at least 10 psi (69 kPa) above the radiator cap pressure rating. Who is correct?

tech a

Tech A says that most coolants are designed to last the life of the vehicle. Tech B says that a hydrometer can be used to test the freeze point of coolant. Who is correct?`

tech b