1998 Volvo S70 Q&A
1998 Volvo S70 Question: Why do my windows constantly fog up on my 1998 Volvo S70 when they are up?
Even when the defroster is on the windows constantly fog up until I drive with the windows downs. It has become dangerous now in the cold weather. I've replace the pollen filter. The blower and temp work fine. Is it the recirculation switch or flap under the plastic cowl intake? I took it off the cowl ran the car with the blower & temp on and the flap on the recirculation never move when I engaged it. It moves freely like it is no attached to anything. Thanks George. - GHCON
poss vac leak at heater control valve or controller - globalhelper
Is the air conditioning compressor working? That is what dehumidifies the air even when the temp is on warm (when defrost is selected). - ziptie12
You likely have a leaking heater core. Is there a sweet smell from the vents when running the fan? Is your coolant level slowly dropping? - Bret Bodas