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Old 12-16-2018, 12:57 PM
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Location: Gastonia, NC
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Odd Heater/AC Blower Behavior 300SDL

1987 300SDL
Sometimes the heater/ac blower will not come on until I pull the turn signal stalk back to flash my bright lights without the headlight switch being on. I do not understand electronics very well, but Id like to trace this down. Any pointers?

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Old 12-16-2018, 07:38 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,832
Two things come to mind:

1) Blower motor brushes are worn. Does it come on immediately if you set it to defrost?

2) Key switch is worn. Does jiggling the key get the blower blowing?

There’s a dozen other things it could be :/

98 E320s sedan and wagon
02 C320 wagon
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Old 12-16-2018, 08:00 PM
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Since those two circuits have nothing in common with each other, I'd suspect our old friend, the bad ground. There's a group of grounds behind the instrument cluster and another behind the center console. Wonky ground connections can cause all sorts of bizarre behavior when one circuit starts back-feeding through another when it isn't supposed to.
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Old 12-16-2018, 10:09 PM
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Location: Gastonia, NC
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I appreciate the replies. I think Ill start with the grounds behind the console. There have been a few times that I could get it to kick on by bumping the console on each side near the climate control unit. Now when I want the blower on I just select the setting on the unit and then flash my headlights and the blower comes on...every single time.

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