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Re: Blower Motor confusion Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 26 Jun 2003 06:03:57
In Reply to: Blower Motor confusion, TRJ, Wed, 25 Jun 2003 11:57:18 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The speed of a motor is related to the voltage to it, and the current to the motor is proportional to the load.
Yes, a motor can run slower at full voltage, but it won't do it for long - it'll be pulling a lot of current, and that current is heat. If the fan is hard to spin by hand, then the bearings are shot. If you have a shorted winding, it will also pull a lot of current and go slower.
Since the fan worked fine on the bench, I'm betting that you have a voltage drop to the fan. After all, that's how the speed is controlled in non-ACC cars - to slow the fan down, stick some resistance in the circuit.
I have no image in my head of what you did to wire around the exisiting ACC controller. One side of the fan motor should be attached to a good chassis ground. The other side connected through a switch to a good 12 volt source. If you wanted to make the fan run slower, just add some resistance. Not a lot of resistance is required - the Saab resistor pack consists of a few turns of resistance wire - 1 to 3 ohms will make a big difference in fan speed. Given that, it wouldn't take much of a poor connection in your wiring to slow the fan down. What wire gauge did you use? It should be 16 gauge minimum. Switching a motor load is murder on switch contacts - it's possible that the switch contacts have carboned up.
I'd go after the wiring first, mostly because getting a blower motor in and out is no fun, and a new blower isn't cheap.
posted by 192.249....
, Thu, 26 Jun 2003 06:03:57 <-- Viewing This Message
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