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Another one for those in the know:

2004 CTT: fitted with 4-zone aircon wich seems to work fine.

I've replaced the cabinfilter the other day (FILTHY) and it was fitted with the airflow arrows pointing towards the condenser i.e. the front of the car.

According to the leaflet wich came with the new filter however, it has to be fitted with the airflow arrow pointing towards the rear of the car...seemed to make sense so fitted it this way.

Now it seems like aircon makes a sound I don't think it made before: when the aircon is set to 'auto' you can hear a high pitched 'sizzle' exactly like that of a fridge when it's active...?

When I set it to 'econ' (thereby switching of the airconpump) the sound stops...

So has anybody else noticed this sound and is it normal or is it because the filter in fitted the wrong way round?

Also, is this the only filter connected to the airconsystem or is there a secondary one due to the fact it's a 4-zone system?

Questions questions.... :-)

Edited by Stephtell
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The refrigerant flowing through the expansion valve when a/c is on is usually the source of the noise.

The bad news is that when you can hear the hissing noise, the system is probably low on refrigerant due to leak etc.

As for the cabin filter for the 4 zone system, there is only the one.

Edited by bigbuzuki
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