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  #1  
Old 10-11-2017, 09:41 PM
AAKNJ
 
Join Date: Oct 2017
Location: New Jersey
Posts: 2
Troubleshooting climate control for 1979 300D

I am trying to troubleshoot the climate control system in my 1979 300D. The car has 188K miles on it and has worked flawlessly until it stopped. I am suspecting the climate control amplifier but would like to test components of the system prior to just purchasing new parts and installing them. Does anyone have a test approach that would help isolate the problems I am experiencing? Thanks in advance.

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  #2  
Old 10-12-2017, 12:22 PM
Registered User
 
Join Date: Jul 2011
Location: bellevue, wa.
Posts: 106
What kind of issue are you having? No regulated heat? No fan? No flap control? That year has the unreliable servo unit.
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  #3  
Old 10-12-2017, 02:04 PM
Senior Member
 
Join Date: Nov 2002
Posts: 730
try here-

Mercedes Benz 107 SL SLC Heat AC Climate Control Troubleshooting

it's the same system in both cars. good luck, chuck.
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  #4  
Old 10-27-2017, 10:54 PM
AAKNJ
 
Join Date: Oct 2017
Location: New Jersey
Posts: 2
Hi Paul,

Pretty much no regulated heat. I replaced the blower motor which was seized and now have heat through the defrost setting, but no high or low heat. I know the servo and the blower motor are working. I am suspecting the push button control may be next on my hit list but just thought I would try to get some direction before I wade into that.
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  #5  
Old 10-27-2017, 11:37 PM
Senior Member
 
Join Date: Nov 2002
Posts: 730
The factory info gave no clues? Pity, always helped me. There is no silver bullet for this system. Good luck, chuck.

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