for about a month I had to constantly add water to my overflow tank- looks like it gets too much pressure in there. I have replaced the tank and a cap so far.Please help with any ideas.
The car is '87 300TD with about 140000 miles and a radiator that was serviced in a shop about a year ago. While driving, the car does not overheat, but after being parked it leaks the coolant unless there is only very little left in the bottom(light comes on).