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Old 06-09-2014, 01:35 AM
Registered User
Join Date: Jul 2009
Posts: 5
Angry climate control problems

nothing is working buttons do nothing blower does nothing hot air comes out dash vents can't stop it 87 300sdl don't know where to start thanks in advance

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Old 06-09-2014, 08:46 AM
Registered User
Join Date: Sep 2007
Location: Calgary Alberta Canada
Posts: 1,281
If I remember correctly from previous threads this model could suffer from dry solder joints on the climate control. Fairly easy repair to remove and reheat all of the joints. Good luck.
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Old 06-09-2014, 11:37 AM
JamesDean's Avatar
Electrical Engineer
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,031
1) Does the blower change speed? Can you set it high to low?

2) When you push any of the control buttons do you hear things changing or moving at all?

3) Have you verified all fuses are OK?

All of the climate control can suffer from cold solder joints. If you are interested I would be happy to re-flow the unit for you. See my link in my signature below for more information.
Cruise Control not working? Send me PM or email ( I might be able to help out.
Check here for compatibility, diagnostics, and availability!

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Old 06-09-2014, 11:37 AM
winmutt's Avatar
85 300D 4spd+tow+h4
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,331
Well you can stop the heat by pulling the plugs. I would start with a reflow of the CCU.

1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
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