Finally fixed my climate control. Using the excellent advise from this forum I did indeed find a cracked solder joint on the CCU board and repaired it and am now enjoying heat. Many thanks to those kind souls who shared their expertise. I probably would have never found the problem without their advise.

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John Schroader
bio burnin' 83 300D, '83 300 SD, '79 240D
"I've never met a man who was good at making excuses who was good at anything else" Ben Franklin
"You cannot permanently help a man by doing for him what he could and should do for himself" Abraham Lincoln

Gotta love the free advise and experience here. Saved me tons of time and money. And I've learned a ton to boot.

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Congrats

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project