The last few weeks my 96 850 has overheated occassionaly. It does it more often when the care is at a standstill. I do not see any leaks. When I fill up the reservor it stays full as long as the car is not moving but if the car is driven when I come back it is empty. Not sure if it's connected, but the air conditioning quiet working. It will blow air but not cold air.

Any advice would be appreciated.

Thanks,
Michael

 

Do you hear the cooling fan coming on?
I will bet the relay or the Fan is bad.