Date registered: Oct 2017
Vehicle: 1985 Mercedes 190D, 1980 Mercedes 300SD, 1981 Mercedes 380SL, 1977 Mercedes 450SL 60k miles
Location: North Carolina, USA
Mentioned: 0 Post(s)
Quoted: 9 Post(s)
Mercedes ACCII Blower Only Works on Defrost
I have a 1980 380sl with the wonderful ACCII system. My servo had a crack in it, so I replaced it this weekend with the unwired tools electronic upgrade kit.
Before the replacement:
-Heat didn't work, but the blower motor came on for every setting (DEF, Auto Hi/ Low, and Bi-Level).
After the replacement:
-The heater valve does open (because of the kit), but the blower motor only works on the Defrost setting.
I have completely gone through every vacuum line, and I cannot locate any leaks. The new controller is getting 12v power.
I cannot figure out why the blower motor worked on all settings before the install, but now will only come on in Defrost. Any advice would be greatly appreciated. Thanks!