Could someone who has their thinking cap on help with this?
I got the V12 car out of its lockup this evening and when I turned
on the fan switch (engined warmed up) there was no response.
It didn’t take long to establish that fuse no 6, which on this
vehicle is marked as being ‘AIR CONd RELAY & CLUTCH’ and is rated
at 15 amps, had blown. I replaced it and the fans started but then
it promptly blew again. A little investigation shows that the
resistance to earth on the equipment side of the fuse is 35 ohms
with the function switch off, 55 at low, and something else in
between at auto. These resistances are only visible on the right
hand side of the holder clip. However, when I measured the current
draw through the fuse path it shows a whacking great 16 amps. Not
quite a dead short but quite a low resistance.
I can’t quite reconcile these two measurements - 35 ohms shouldn’t
(and doesn’t) cause the fuse to blow. By my reckoning the current
draw should be about 0.4 amps. But nor should 55 ohms - the
current should be even less, ~0.25 amps.
The schematic is a bit confusing in my copy of the S57 diagram.
The feed from the fuse should to the on/off switch and then either
to the vac control for the recirc flap or (when mode switch is on)
to the water temp switch and the amplifier. Could one of those
last two be the source of the current draw? If so, which?
Any thoughts on what to check next would be most welcome.
I am a bit reluctant to tear into the 6 cylinder car for
comparisons as at the moment its air con is working and we are
having some unseasonably warm days.–
al mclean '93 XJS 4.0 - '84 4.2 Daimler - '84 DD6
Telford, United Kingdom
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