1994 Vision TSI

I have a overheating promblem. I have removed the t-stat, flushed and reversed flushed the motor, heater core , radiator, replaced the water pump. If I drive about 12 miles it just overheats. The rest of the time to temp is fine. This happens either driving it hard or taking it easy. Thank.

Hard to tell.

Is the coolant adequate and 50/50 mix? Is there a leak that loses coolant, e.g. a hose or fitting? Does the cooling fan turn on?

Fan turns on I notices a little white smoke coming out the exhaust. So either bad head,or gasket or really bad cracked block.

Run a Compression test on the cylinders. Any leakdown points to what you may already have thought. Ouchers.

I have a overheating promblem. I have removed the t-stat, flushed and reversed flushed the motor, heater core , radiator, replaced the water pump. If I drive about 12 miles it just overheats. The rest of the time to temp is fine. This happens either driving it hard or taking it easy. Thank.change coolant temperature sensor/right next to t/stat