Some time ago I found a nice blow-by-blow description of how to change the t-stat on a 603 ... can't find it now. Can someone give me a step-by-step description for doing that job? I'm not sure if it's one I can do on my own, but I have the new t-stat and thought I might try the job.

Is this job at all idiot-proof? What things do I need to look out for or be prepared for?

Starting mid-week I'll have a second car (yes, the Liberty CRD is joining my stable), so I can actually do jobs on the MB without worrying about having it up and running to go to work at 4 p.m. every day.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)