I have a 1995 940 Sedan, B230F, just picked it up. At idle and at cruising speeds, air blows from the vents just fine and increases in force with each turn of the fan dial. However, when the engine is under load, i.e accelerating or just getting on the pedal on the highway to pick up speed, the air from the vents drops right off. When I back off on the pedal the air starts blowing again. Any suggestions? Please post your reply here but also send it over to dece207@aol.com

Thanks!
Dave

 

Check under the hood there is a couple of one way valves.The supply Vaccum to the heater system.There is a small line that goes inside the car.Follow it backwards and make sure the valve and the lines are good and not cracked.