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

There are many posts here concerning the acc servo on these years and this is primarily the failure point for most of these cars of this vintage.
Try a search at the bottom of this forum for "acc servo" and you wil have more reading than you want probably.

The only sure fire way I have found to test this is to install a known good unit and see if everything works.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique