Air conditioner and acceleration

Lin · Post by **Lin** » 11 Jul 2005, 16:04

We just got a 1997 S90 with climate control. I find that even during normal acceleration the A/C seems to shut down. I know that the fan does for sure. What needs to be done? Thanks, Lin

Kmaniac in California USA · Post by **Kmaniac in California USA** » 11 Jul 2005, 17:43

Are you absolutely sure the blower fan motor is shutting off completely? Manually set it to the highest setting the next time you drive to be sure. I suspect your ventilation dampers are redirecting to defrost mode with the loss of engine vacuum under acceleration.

Please do a forum search on keyword "kmaniac" and read my posts on this subject. Then take a look again at your car and let us know what you find.

Lin · Post by **Lin** » 12 Jul 2005, 00:02

Sounds like a good possibility. I once had a 1983 Mercury with climate control that would default to defrost with heat when vacume failed. That turned out to be a few bad lines and faulty check valve. I would be happy to find it is the same thing here. Tomorrow I will see if the defrost is going on. Thanks