Tinypanzer, you lost me with your suggestion in re: the CTS as a possible fix for the OP's climate control system. Inasmuch as the two thermistors in the CTS provide signals for the KE controller and the EZL controller, neither of which have an effect on the CCU, what's your thinking about how a bad CTS will lead to the no heat condition from the CCU? I'm not doubting you, just need clarification of how that could be the cause.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't