Frog_Diarrhea@alien.topBtoMechanic Advice@gearhead.town•Just bought a used car. What is this?
1·
10 months agoRust.
Rust.
Please take your car to a mechanic.
They dont usually get stuck closed, but it can happen. I’ve seen them stuck open more times.
I’d also make sure there’s no air in the system. We always use a vacuum fill on cooling systems
Vacuum leak somewhere would be my first thought.