Here's one that might be difficult for me to describe... if you've pulled early air con modules apart, please bear with me - you might know the answer to my question! :-)
I've been pulling apart an old under-dash air con module. (Dave, this is the one you sent over - aside from 3 cubic metres of Western Australian red dust inside it, the fan motor works fine after a bit of sand paper and grease on the spindle.)
I'm trying to figure out the electronics. It's actually fairly simple inside, but I can't figure out how the fan speed is supposed to work.
Power comes in, and connects to a switch that switches power to 3 separate wires, marked L (low), M (medium) and H (high). It's not one output wire with internal resistance added depending on the switch position, which is what I expected to find, it's actually 3 separate wires.
These three wires all head to a weird thingy that's mounted in front of the fan, that has two springs and a metal clip of some kind. What this does, I have absolutely no idea! Although obviously it controls the voltage somehow...
From there, the fan output wire actually connects to the L wire (but the M and H wires are connected via that weird spring thing).
The spring thing is not the thermostat - this is elsewhere.
Any idea what the spring thing is? In any case, it's broken. If I disconnect the M and H wires, the L wire happily powers the fan, at full speed. With them all connected, I get smoke from the spring thingy, and a blown fuse!
Thanks,
Jason.
Edited by user Sunday, 8 January 2006 7:19:54 AM(UTC)
| Reason: Not specified
