You need to fix this leak pronto (try the hints first) or bypass it and unplug it. If coolant gets into the motor, it will short and fry the climate control pushbutton unit, and you will be out another couple hundred bucks to get a defroster....

If you bypass it, you will get wide variations in cabin temp as the circulation at idle isn't that good, but that's better than full heat all the time from a blown PBCU or no heat at all!

Sadly, no one ever said these cars were cheap to maintain....

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!