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S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

1991 350SDL rear defrost issues

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Old 12-30-2011, 09:36 PM
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1991 350SDL, 2006 E320CDI, 1999 F250 7.3L Crew Cab 4X4
1991 350SDL rear defrost issues
My wife drives the SDL daily. Recently I noticed the rear defrost switch would not light up when rocked in the up position. I replaced the switch, but noticed the light would not time out and turn off by itself. I recently drove the car and noticed the light will come on when you press the switch in the on or upward position, but will not stay illuminated. It goes out as soon as you let the switch go.

Any ideas as to what might be wrong?

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Old 12-31-2011, 04:04 PM
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1991 350SDL, 2006 E320CDI, 1999 F250 7.3L Crew Cab 4X4
274 views and no opinions??

Is there a relay that controls when the switch come on and how long it stays on?
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