Glossary / Engine

radiator cap

12 Episode Mentions

Too Afraid to Ask

The radiator cap is a screw-on cover that keeps the coolant inside and helps it stay at the right pressure. If it’s bad, the engine can overheat.

Technical Definition

The radiator cap seals the cooling system and maintains pressure, which raises the boiling point of coolant. A faulty cap can cause overheating or coolant loss.

Hear It Discussed

"But when you see it, it has a fake a foo, a full radiator cab. A fooradiator cap. And I ordered a new one because it has some scratches."
Why Community Makes Car Culture Last - Tailpipes & Tacos in Beaumont In Wheel Time Podcast: Your Go-To Automotive Talk Show 10:51

"we will actually jack up the front of the vehicle to make the radiator cap higher than the heater. And that usually gets the air out"
#2649: Look Out for Those Gila Monsters! The Best of Car Talk 20:53

"I went through about four or five radiator caps new. Okay, and is the port itself clear? Yep. All right, then you've got something that's defying the laws of physics because regardless of what kind..."
Ron Ananian, The Car Doctor - Classic Car Doctor - August 29, 2015 - Shop Time, Strange Noises & Real Repairs Ron Ananian The Car Doctor 16:49