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Old 07-20-2005, 05:36 PM
Veloce300DT's Avatar
Join Date: Dec 2002
Location: Sacramento-Bay Area Corridor
Posts: 1,110
A/C on = NO HORN. Why?

Its been HOT here!
The past couple of weeks have been 100 degrees and up!
Needless to say ive been utilizing my ice cold A/C in the 300DT over the duration of this heat wave. However, there have been times recently when ive needed to use my horn to signal my presence for unattentive drivers- but when my A/C is on my horn doesnt work! I can sometimes get a faint wimpy beep, but 98% of thhe time I can lean on the horn as hard as I want and I get nothing. If I switch the A/C off the horn works fine. Ive noticed this has been a problem on all 3 of the w123's I have owned so im sure im not the only one who has experienced this odd behaivior.

Anybody know why it does this?


1995 E420
1992 BMW 525i
1984 300D Turbo sold
1993 Volvo 244 sold
1995 Volvo 944T R.I.P!

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Old 07-21-2005, 06:56 AM
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Humm, I don't have A/C so I cant help much. You could check the wiring diagrams ound online and in the Haynes/Chiltons manuals to see if there is a relation in circut.

I do know of a cruel trick to play with a good friend if you work on their car...

Be sneaky, swap the A/C clutch power line with the horn wire. After they leave the shop and turn on their A/C the horn will blare! It will take a few seconds before they put 2&2 together. Kind of cruel, but VERY funny.

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