Reserve overflow cap popped off no indication of overheating
Went to car wash had car running well vacuuming all
of a sudden overflow cap popped off no overheating
on dash put water in it and try ed to get home but it
went all the way to hot
Could be a thermostat, but being a Chrysler it sounds more like it blew a head gasket. You can get a DIY kit from your local parts store, just follow directions.
I looked up the overflow tank cap the one on it doesn't look right it is the silver radiator cap with the red push down like button online it say radiator cap
The red button is a pressure release, but your right that should not be on there, get one from your local parts store, it should just look like a normal radiator cap, no pressure release.