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Old 05-12-2007, 10:40 PM
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1995 e420(w124)

Does any one know where the AUX FAN FUSE is in this car?Placard on fuse box states aux fan fuse located out side box . Thanks. Dan

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Old 05-12-2007, 10:53 PM
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Drivers side - Next to the strut tower. In a oblong black plastic case - flip open the lid to find a blade fuse.

Picture in this thread, post #6 94 e420 A/C blower just quit!!
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Old 05-13-2007, 12:35 PM
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I get the impression that two different blowers are involved here. The strip fuse is for the blower that blows air in your face. The aux fan blows air onto the condenser and radiator. I think those fuses are on top of the two relays that control the two speeds.
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Old 05-13-2007, 02:39 PM
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There is a second strip type fuse that is closer to the firewall. Could that be it? (can't think right now...ate too much at brunch )
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Old 05-13-2007, 08:23 PM
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Well, I found two problems. #1 ,30 amp fuse on top of relay under cover behind fuse box blown. #2 , Wire going to the top of the large resister in the left front fender well corroded and crystalized. Fixed both and now fans run as specified, however , the resister cover is getting hot when the low speed fans are operating. Is this normal? Thanks, DAN
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Old 05-13-2007, 08:35 PM
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Well, I found two problems. #1 ,30 amp fuse on top of relay under cover behind fuse box blown. #2 , Wire going to the top of the large resister in the left front fender well corroded and crystalized. Fixed both and now fans run as specified, however , the resister cover is getting hot when the low speed fans are operating. Is this normal? Thanks, DAN
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Old 05-13-2007, 09:38 PM
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Quote:
Originally Posted by 944s2c View Post
Well, I found two problems. #1 ,30 amp fuse on top of relay under cover behind fuse box blown. #2 , Wire going to the top of the large resister in the left front fender well corroded and crystalized. Fixed both and now fans run as specified, however , the resister cover is getting hot when the low speed fans are operating. Is this normal? Thanks, DAN
Normal..Resistor dissipates heat required to drop the voltage for low fan operation..that is why it is ceramic composite and high wattage.
You may also want to upgrade the 15A fuse for low fan relay..this a a Benz mod to 25A.
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Old 05-14-2007, 10:01 PM
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I understand that adding resistance will generate heat... any possibility this heat cycling degraded the wire connection on top of resister? This connection appears to be #18 wire , where as the lower connection appears much larger...possibly #10 wire.
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Old 05-14-2007, 10:08 PM
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Yes ,they tend to burn up..
The reason for the different gauge wires is b/c there is less amperage draw for low fan as the resistor is in series with the circuit, whereas the other wire by-passes the resistor for high fan, which has a higher draw.
Some guys do go back to the relay with a heavier wire because they were marginal to begin with..the trick is to have good , solid connections at the resistor ends..I use appliance wire end/connectors [ hardware store item..or RS] as they can withstand the heat much better..

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