The old two-hose-and-an-overflow deisel coolant bottle  in my '82 sprang
a leak, so with a brass plumbing fitting  I replaced it with a jetta
one-hose-and-an-overflow coolant bottle.
Runs cool....but after an hour or so  of running, when the engine is
turned off, there is serious boil over......I'm thinking the pressure
cap is nogood,  but I have a sneaking feeling there is a flow restrictor
or something in the jetta set up. Any experience on this amongst
listees?

Thanks all
Bill M
82 jetta conv