I have a 1990 Jetta 1.8L Yesterday the coolant adapter on the side of the block cracked and I had it replaced, no problem. I went to the car this morning and the coolant light is flashing, it had only been warming up for about 2 mintues and according to the temperature gauge was nowhere near hot. The owner's manual says this light will flash if the coolant is too hot (it wasn't) or it is low on coolant (again, oit wasn't). Could the sensor that also attaches to that adapter be broken or not connected properly? Or is it something else? After having the work done yesterday I drove the car home (over 60 miles) with no lights flashing or heat problems. Hmmmmmm. Any ideas?