The FSU(hedgehog) should have nothing to do with the auxiliary fan(AC fan on radiator)
The FSU is for the heater blower motor only IIRC.
I see. If that's the case I'm suspecting a faulty blower then as the FSU gets warm so there is power getting to it.
Dont really fancy having to take the dash out to change it.
Does anyone know where the blower relay is? I'm going to explore all avenues before I commit to pulling the dash out.
540i Mick (04-09-2008)
If you are unsure whether or not it's the heater blower motor itself, then you can feed 12volts DC to the 2 wires on the plug that you remove from the FSU to check for heater blower motor operation. feed positive voltage to the red wire w/ green tracer and negative on the black w/ green tracer (525i 2001)
Today I decided to pull my finger out and find out once and for all what the problem was as I didnt fancy freezing in the cold snap thats coming.
I changed the only relay I could see behind the glove box and both the big fuses and while it was in bits got the battery charger out and put 12v direct to the motor as per Ronnie's post above. With 12v applied the motor blew fine so I put the hedgehog back on and all is well.
I'm still not sure what the issue was as I tried 3 things at once but I'm just glad the car is finally 100% ok.
The hedgehog and the aux fan are not related in any way.......There have been many problems with aux fans,try and spin the aux fan blades or just try and switch on the AC and see if the fan runs.The temp gauge will read in the centre of the gauge from about 70 degrees to 115 degrees or so...any thing over that just goes to full hot and the light comes on....plenty of warning eh??!!!
A bit of a further update.
The blower is definatly at fault. It packed up again the other day so this morning i fed it 12v and it was a little slugish spinning with a bit of a squeal from the bearings once it was spinning ok I reconnected the hedgehog and it's ok for now.
So it's either run some wires to jump start it or get a new blower.
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