Exam 14: Cooling System

What is the name of the small valve in the center of a radiator pressure cap?

Why is there a small hole in some thermostats?

A 30% water and 70% antifreeze is the maximum mixture that should be used.

What can happen to the coolant pump if cold water is added to an overheated cooling system?

Technician A says coolant is disposed of as hazardous waste. Technician B says ethylene glycol is flammable at room temperature. Who is right?

The jiggle pin or check valve in a thermostat helps bypass coolant as the temperature rises.

Technician A says water will absorb more heat than ethylene glycol. Technician B says permanent antifreeze/coolant does not evaporate. Who is right?

Technician A says that for each pound of pressure on the cooling system, the boiling point raises one degree Fahrenheit. Technician B says engine rebuilders epoxy heat tabs to the cylinder heads to protect against dishonest warranty claims. Who is correct?

What is another term for extended-life coolants?

Technician A says that the pressure cap can raise the boiling temperature of the coolant. Technician B says that the small valve in the center of the radiator cap is the vacuum valve. Who is right?

What substance can be used to dilute coolant that has too high a concentration?

For each pound of pressure on the coolant, approximately how much will its boiling point increase ? _____ °F

What passage allows coolant to circulate within the block when the thermostat is closed?

Technician A says conventional coolants with silicate additives have a very long shelf life. Technician B says European coolants contain higher concentrations of silicates than found in North American coolants. Who is right?

Water pumps are sometimes driven by the timing belt.

Two technicians are attempting to locate a leak by using a pressure tester on the radiator. Technician A says to use a mirror and flashlight to locate a leak if the location cannot be seen. Technician B says to run the engine when performing the test. Who is right?

Technician A says the lower radiator hose suffers the most abuse. Technician B says that a defective hose may be easily determined by outward appearance. Who is right?

When the bottom of a radiator core feels considerably colder to the touch than its top, it is probably plugged.

When a radiator is disassembled and cleaned out, this is called _____ out.

Two names for the part of the radiator that automatic transmission fluid flows through are the transmission oil cooler and the heat _____.