Hi Diesel friends,

With some help, I've solved most all my climate control issues in my 83 300d this year. List includes: replaced the thermostat, replaced the OEM mono valve with a Klima, replaced the CCU and replaced the aux water pump (with fuse to protect the CCU).

So, I now have both heat and A/C that are working properly! That's the good news.

However, when running the A/C (modified to 134 years ago), the idle is sluggish...but only at a stop and in Drive. On the road, it's fine. And at a stop, if I shift into neutral, idle is perfect.

(Note that this oddity of sluggish idle with A/C on was the same before replacing all the items listed above).

Wondering if anyone has solved this mystery and can share. I'm thinking that perhaps adjusting the valves would help (it's been 24,000 miles since last valve adjustment) or if there might be something else.

FWIW, car has 361K miles!

Thanks in advance, BD

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1983 300D