Well, looks like thermostat is shot (kaput?)--there's a hole in it.
I've checked back through the last 12 months of posts here in the garage and have not found a PN for the thermostat.
That said, a buddy has one that looks about right (NOS, PN 021-119-159A), but don't know if that's T1 or T4 . . . .
Is that the right PN?
Steve A-