At my wits end here . New climate control unit and blower . Swapped resistor with a junkyard unit and even replaced supplementary water pump just because it was ugly. Seems like I get a varied voltage at fuse 8 but thought that could have been the resistor. Help

Found the problem, blower regulator has a burn pin. But now the question for you guys. Mine has a number 1 147 328 027 , on it and all the replacements I have seen have a slightly different number like ending in 026, in there a difference? Sorry if I seem like a noobie. First Mercedes . I would resolder the pin but the board look a little toast at that trace. Any input would be appreciated. Thanks

Hello Frank - glad that you were able to resolve the issue. If you have any further issues, please take a look at the link below to our site's DIY tech articles on the W123 platform. Please let us know if you have any questions!

Mercedes-Benz W123 300TD (1977 - 1985) Technical Article Directory | DIY Maintenance and Repair Projects for MBZ 230, 240D, 280 CE, 300D, 300TD | Pelican Parts