Re: OT: Jeep AC / Heat Fan - Saab General Bulletin Board - Saabnet.com
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Re: OT: Jeep AC / Heat Fan
Posted by compaqted (more from compaqted) on Wed, 6 Aug 2003 06:20:14
In Reply to: OT: Jeep AC / Heat Fan, SS, Wed, 6 Aug 2003 06:14:45
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This is a classic 'step down' problem.
The switch has four settings, 1, 2, 3, and 4. On '4', the switch is directly pulling in power and sending it to the fan. But on 3, 2, and 1, the switch is 'stepping down' the amperage using an internal or external resistor so that the fan turns slow, slower, and slowest. There may be a relay doing this, or it may be built into the switch. That's why on '4' it works, and on the other settings, it doesn't. There is no 'stepping down' circuit in 3, 2, or 1.
First, check for the 'fan relay' under the hood or dash and replace with a known good one. If that doesn't work, the switch itself may be at fault.
posted by 12.4.21...
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