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The fan itself is really only one speed Posted by Ari [Email] ![]() ![]() In Reply to: 97 CSE: one speed radiator fan w/ two speed wiring?, John Fitzgerald ![]() ![]() |
What makes the fan a two-speed fan is the resistor. If you get power directly to the green wire on the fan, it runs at full speed. If you run power through the resistor, the same fan runs slower (low speed).
The 'two speed fan' is no longer sold, so you got the "fan unit." I believe that you need to swap the resistor over from your old fan. I don't think there is another fan assembly to use.
Yes, if you apply 12 volts to the fan without the resistor (go directly to high speed), you WILL indeed pop the fuse. The current required to start the fan from a dead stop will pop the fuse. If you get it up to (low) speed first, the fuse will be OK.
The fan resistor is 0.22 ohms, +/-5%. Now, most digital volt-ohm meters don't read accurately down that low. But the typical failure modes of the resistor are either an open or a short, open the most common. So if the resistor reads open, it's bad. For a short, that's a little harder. Put your meter leads together and see what the meter reads at the lowest resistance setting (if it can be set). Then measure across the resistor. If it reads slightly above the reading with the leads together, it probably isn't shorted.
In terms of wiring-
The black wire of the fan goes to ground. The green wire of the fan goes to one side of the resistor, AND the green/white wire from the high speed relay. On some schematics, this shows as a white wire. The other side of the resistor goes to the green wire from the low speed fan relay.
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