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what do these do?

J

jlee

Monza
Joined
14 Nov 2007
Messages
200
On the dashboard there are sliding levers pointing up and down (to the left of the large and small snowflakeac buttons)

Buggered if i know what these do. have tried moving them but seem to do nothing, as does the large snwflake button.

Sort of fun having no owners manual working some of this out (need to get one, anyone know where i can buy?)

Still loving the car and smile every time she fires up and loving staring at her!

You veterans still doing this or does it go away?
 
The Climate Control Unit (CCU) is a complicated beast I'm afraid and it's functions depend on a number of fans and servos around the car. The diagram below might help explain the functions of the buttons but it's highly likely that you have something amiss in the fans and servos - because most 964s do - and to troubleshoot it is no mean feat.

The key to most of it is the operation of the 5 servo motors in the luggage compartment immediately in front of the windscreen. These operate the flaps in the mixing chamber to direct air in and out to the selected places. These are operated by the sliders you mentioned. It's very common for one or more of these servos to give up the ghost.

The big snowflake is the air conditioning. Unless your system has a decent amount of refrigerant in the system the compressor clutch won't engage when you press the snowflake - so you won't get any cold air. Even if it does engage the system won't be very effective unless it's well charged with gas.

The other common problem is the blower fan in the engine compartment. Very little will happen on the heating front is the rear blower doesn't operate. Often just a blown fuse (30 amp) but can be worn bearings too causing the fan to bind.

There are a series of test you can do under some specific conditions to check the system out but without knowing what works and what doesn't it's difficult to know where to start.

Regards

Dave
 

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