Heater problems - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 04-12-2019, 05:53 PM Thread Starter
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Heater problems

1981 300sd. I cannot turn off the heat. whether the temperature unit is on or off it always is blowing heat. anyone had and fixed this problem??
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post #2 of 5 (permalink) Old 04-13-2019, 09:14 PM
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38 years old car. I wonder how many fellow owners you can meet on the forum?
Welcome.
If I remember those cars, you do have electric valve for heating, who stays normally open.
Your troubles indicate that valve-closing current is not reaching the unit.
Post some pictures ?


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post #3 of 5 (permalink) Old 04-13-2019, 09:27 PM Thread Starter
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I bought the car from the original owner about five years ago. I'll post pics. original paint and not a tear anywhere in the leather interior.
your comments just gave me an idea. will respond in the morning. thank you!!!
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post #4 of 5 (permalink) Old 04-15-2019, 11:59 PM Thread Starter
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got it!! opened the fuse box and noticed the fuse was just a little twisted for number 10, the one controlling the heating value. as I pulled it out it crumbled, broken in many places. I replaced it and the heat immediately responded to the interior control.

thanks for you ideas!! it was very helpful...
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post #5 of 5 (permalink) Old 05-20-2019, 03:25 PM
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I had same problem on a w123 - blown no. 14 fuse.
Replaced fuse and heating problem was fixed.
In my case, heat was on all the time until I replaced fuse.
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