So I'm having a consistent problem with my 1989 Volkswagen Golf GL. The upper head flange is cracking every 2-4 weeks. When this does happen the flange "neck" is shearing off, leaving the outer ring in the hose.
I have had the front engine mount, top radiator hose, and expansion tank cap replaced. I'm currently on my 5th replacement flange. The replacement flange is black thermoplastic, about 8 bucks.
It's not leaking, just blowing the upper head coolant flange.
Any ideas?