212 +. water outlet was 214 or so. It may have been hotter, I don't remember

It was a rolling boil blowing the cap off the reservoir, not just a normal release into the overflow reservoir. I've been driving this truck for over 8000 miles so I'm used to seeing the reservoir rise and fall under normal use when the engine operates at normal temperature.

It was the same behavior that happened when all of this began a few weeks ago.

I filled it with water a little while ago and half the coolant was gone (2 gal)

New 4# radiator cap

Last edited by Otto Skorzeny; 08/13/2024 12:54 AM.
1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)