What is heat?

heat control valve

Glossary “heat control valve” Definition:
Thermostatically controlled valve in the exhaust manifold to divert heat to the intake manifold before the engine reaches normal operating temperature.

heat crayons

Glossary “heat crayons” Definition:
Used to determine the temperature of the aluminum or other metal being heated. They will melt at a specific temperature and warn you to prevent overheating.