MB

My AC (in the new S) isn't coming on.

I push the AC button, light comes on, but AC doesn't engage... no noise from the AC clutch at the front.

Anyone know where the fuse / relay is for it?

loftust

First of all, does it have an AC belt?

Disconnect the connector to the rear of the compressor, and see if you get 12V when you turn it on.

If you do, and the clutch doesn't kick in, then the compressor has had it

loftust

The relay and fuse (58, 20A) are in the engine bay fuse box.

Does the main fan work? If not, check fuse 20, 7.5A under the dash

MB

Lofty.

Will check fuses first, then the dreaded multimeter!

veehexx

low refridgerant?

not enough pressure = wont engage the electro-clutch on AC pump.

GreenmanS2000

turn the fan speed up from low - i though my ac was busted til i noticed i'd knocked the fan speed to zero whilst cleaning the dash.....

E4RTH WORM JIM

First of all, drop the roof and hit the boost button (right peddle)

Also, the 'muti-meter' is the tool of tools....

chrispayze

Hi Mark. What did your problem end up being (if you can remember!)? I've noticed a similar issue with mine today.

Light on the dash is coming on. Relay seems to work (applied 12V and it clicks). Seems to be 12V available at both pairs of relay connectors in the fuse box. Fuse looks intact.

I'm thinking it's either the EMS not outputting the signal correctly, low refrigerant pressure, the compressor electrical connection is dodgy, or the compressor is knackered.

BenM

Its fantastic weather atm, put the roof down instead

Tim S

I had the same when I first had my first AEM fitted. I think Romain had forgotten to do or set something. I took it back to him and he made it work - don't know what he did but it was AEM software-related.