I do have new information about the fan control switch. The Bosch
Scanner showed that it is the Fan Control Switch that is faulty. I got
hold of an 2nd hand FCS and it works only once in the sence that I
started the car and the fan stays off. I fit all the staff, removed,
back and then I wanted to let the car builds up temperature so that I
can confirm that the FCS operate in all it's stages. What a suprise,
the same problem was back! The fan runs although the car just started,
at full speed again.
To fix this I need to know more about the system, but in South Africa,
information from the manufacturer is not freely availible to the
The connection to the FCS have four thick wires and two thin ones. The
four thick ones I am ok with. One pos. and one neg. in for thhe FCS and
one pos. and one neg. out to the Fan. The two thin wires is where I
need to know more about. The red wire is 10V pos. and the green wire is
11V neg. at this stage.
First I cut the green neg. , switch the ign. on and the Fan blows full
speed. Then I cut the red pos. , switch the ign. on and the Fan did not
run. The next I did was to touch the green wire alone (the red wire
still open circiut) with the Super Prope (6V) and the fan start running
at low speed.
My guess is that the two thin wires communicate with the FCS by means
of different amperes for the different fan stages. The big question
now, how and where does the problem come from and then to fix. It is
suppose to be possible, isn't it?
Come on people, lets do it.
I will stay in touch.