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#1
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Auxiliary Fans on 350sdl
The auxiliary fans will not come on on my 1991 350sdl. I checked the fans with 12V and they work fine. I jumped the temp switch on the A/C and could hear the relay closing in the fuse box but the fans still do not go on. The fans will come on or start to come on at high rpms. If I rev the engine when it is warmed up they start to come on (I do not keep it at high RPMs long enought to see if they are on completely.) Any help would be appreciated.
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#2
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There is a temp-sensor switch on top of the engine next to the fuel filter, jumper the two wires and the fan should go on. This is the hot-engine mode.
Jumper the high-pressure switch on the A/C dryer and they should come on low speed, if not then there is a ceramic resistor nearby that often fails. Check also to be sure that they turn freely. It sounds like they might be freewheeling from the airflow when you're revving the engine.
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Gone to the dark side - Jeff |
#3
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Aux Fans
Quote:
Where is the ceramic resistor you are referring to? How do I test it? Thanks |
#4
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I am not sure about 350SDL but I believe it should be similar to the 300SDL. The resister is hidden underneath the brake booster. It is not easy to see. It is about 3" long and 3/4" across. Just measure continuity with an ohmmeter, it should measure less than 5 ohm. Do not remember the exact value.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#5
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2x on the resistor being bad. Edit: yup, that's what the FSM says it's below the brake booster.
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. Last edited by compu_85; 04-21-2011 at 10:56 PM. |
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