Is the S90 an improved version of the 960 or the same exact car with new numbers? I'm wondering specifically if by 98 Volvo had addressed the A/C issue that disabled the A/C when engine vacuum decreases? A Volvo mechanic tells me that the cause is two vacuum servos buried in impossible places under the dash.

Any thoughts on this would be helpful! I LOVE 960's and S90's but would surely love to find one without that problem! Is there a fix?

Thanks!

 

Vacuum drop, as in WOT? That's what it is suppose to do.

The '96 is improved over the '95 but the S series was just the start of Volvo's rebage in '98. Volvo always tries to improve each car all the time. That is why there are changes throughout the year. Like the sides of the seats in the late '98's.

 

The volvo tech was correct. Heave acceleration and the servos leak the little vacume available and close air shutter doors.It is only a matter off time!

 

Has anyone tried using a vacuum canister with a check valve on it? That should work for at least short-duration vacuum loss. An accessory vacuum pump would work but they are notoriously noisy. They are commonly used in vintage American cars with vacuum operated headlight doors and work well, but then you need only tolerate the noise while operating the headlight doors.

 

Volume of vacuum in not the problem,leaking hoses and vacuum motors are the problem.BTW a vacuum motor is actually an actuator not a motor in the usual sense. Fixing the problem is no big deal to the volvo techs that work on them all the time.They don't tear the whole dash out plenty of "tricks". It is easier to fix the problem than re engineer the system.