AC Relay
Moderator: martauto
-
turkeysneck
- E30 Zone Regular
- Posts: 441
- Joined: Sat Nov 27, 2010 11:00 pm
Can anyone tell me which one is the relay for the air conditioning.
-
Brianmoooore
- E30 Zone Team Member
- Posts: 49360
- Joined: Mon Jan 10, 2005 11:00 pm
There's no relay as such for the air con. in the fusebox.
Relay K7 supplies ignition switched power to the whole heating/air con. system and the door mirrors, and relays K1 and K6 control the low speed and full speeds of the auxiliary electric fan, respectively.
Relay K7 supplies ignition switched power to the whole heating/air con. system and the door mirrors, and relays K1 and K6 control the low speed and full speeds of the auxiliary electric fan, respectively.
-
Billwill
- E30 Zone Regular
- Posts: 363
- Joined: Sun Jun 26, 2011 11:00 pm
- Location: South Africa
I do not know what E30 you have but I know on the M40 318i there are two relays stuck just behind the fitted radio. The Haynes manual general circuit diagram also shows these relays.
If you take out the radio you can see the two relays...the larger one is actually a solid state relay in that it has some transistors etc. built in.
The larger relay is energised by the blue air con switch..this relay then energises the second relay; the second smaller relay has its ground side controlled by the temperature control circuitry.
Basically if you put +12 volts direct to the air con clutch it should engage but you must not run it in this manner as you will damage the compressor if it is low on refrigerant.
There is a switch located next to the dryer which will only activate if there is pressurised refrigerant in the system.
What problems are you having.
If you take out the radio you can see the two relays...the larger one is actually a solid state relay in that it has some transistors etc. built in.
The larger relay is energised by the blue air con switch..this relay then energises the second relay; the second smaller relay has its ground side controlled by the temperature control circuitry.
Basically if you put +12 volts direct to the air con clutch it should engage but you must not run it in this manner as you will damage the compressor if it is low on refrigerant.
There is a switch located next to the dryer which will only activate if there is pressurised refrigerant in the system.
What problems are you having.