ac relays?

[doitover]

The AC in my 91 318is has stopped cooling. Could be many things but earlier this year there was a relay clacking sound at low engine speeds that I couldn't determine where it was coming from. That stopped a couple of months ago. Anyway, most A/C's have a clutch relay, I haven't been able to find mention of one for the 318is.

Any idea if there is one and if there is, where it is located?
Thanks,

[DesktopDave]

I'm told that there is an Evap Temp Regulator under the dash that controls the compressor clutch.  Looks like a normal relay with six pins.  Found this useful bit out on the web.

I'm not sure where it is though, I don't recall one off the top of my head.  I'll go check my spares to see if it's clipped to the heater box.