I have recently purchased a 300 cd with heater control problems. The only way I can get heat was to reroute a heater hose and turn the controls to defrost. This makes the defoster blast heat but there is no heat going to the floor and there is no ability to adjust the fan. My question is are there any people who have retro fitted different climate controls to their 123? Or am I doomed to pay for replacement of all the heat control parts?

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91 350 SDL
91 300 E
85 300 D (sold)
79 300 CD (sold)
91 300 CE