ac question 1973 280 sel - Mercedes-Benz Forum

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post #1 of 25 (permalink) Old 06-23-2014, 08:16 PM Thread Starter
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ac question 1973 280 sel

Recently had it in the shop to fix the ac. I thought it was going to be super expensive. They said it was just a loose wire. I tried to use the ac the other day, it it came on, blew cold, and then shut off abot 30 seconds later. It now won't come back on. Could it be a fuse, or the wire loose again? I had a similar issue with the dash lights. They said it was a fuse, the light worked fine, then went out the next day. Could it maybe be an irregular voltage issue or something like that? I'm trying to get better at fixing this car on my own, so any help is greatly appreciated!
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post #2 of 25 (permalink) Old 06-24-2014, 08:35 AM
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does the fan shut off , or it just is not cold anymore ????
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post #3 of 25 (permalink) Old 06-24-2014, 11:05 AM Thread Starter
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It does nothing now. No fan or green light. Worked once after the shop for a few seconds, then shut off like someone flipped the switch off. It did blow cold for the brief time it was on.
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post #4 of 25 (permalink) Old 06-24-2014, 03:10 PM
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Blown fuse or other electrical connection interruption.
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post #5 of 25 (permalink) Old 06-24-2014, 03:55 PM
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Or bad ground.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #6 of 25 (permalink) Old 06-24-2014, 06:05 PM Thread Starter
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Would I have to remove the dash to check the ground? I found the fuses, so I'll check those tomorrow. I can't find a manual, so I'm just not sure what is ac, and what is heat. I know they are two separate systems. Thanks for the suggestions.
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post #7 of 25 (permalink) Old 06-24-2014, 07:40 PM
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Post picture please. If it is under-dash KuhlMeister or equivalent I think that the ground is the unit itself screwed into the car. I thought for your model year they were not so separate though. On a 114/115 they are separate, but on a 108/109???

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #8 of 25 (permalink) Old 06-24-2014, 08:09 PM Thread Starter
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Thanks, I'll post pics tomorrow. I appreciate the help!

I may be thinking of the wrong thing.I just know the mechanic mentioned the ac and heat had separate motors. I had the motor for the heater replaced because it was seized up, but they said ac one was fine.
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post #9 of 25 (permalink) Old 06-24-2014, 09:46 PM
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The mechanic is probably right. I'm not familiar with the later AC on W108 cars. The early ones that have Kuhlmeister like in a W111 don't have a separate ground wire - they just ground to the attachment points. But post a picture when you get a chance. Also, the fuse for the AC is possibly NOT in the fuse box but instead in a small 2-fuse fuse box near the firewall (like the radio fuse for example)

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #10 of 25 (permalink) Old 06-25-2014, 10:21 AM Thread Starter
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Please let me know if I need to take more detailed pics of something.

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