My 87 300D cycles quite a bit, but I don't feel it, no drag to speak of.

Be aware that many places still want to overcharge converted systems to "give them more capacity" when in fact you need 85% of the R12 charge, or it won't cool very well.

Constant cycling is usually an indication of low charge, so you may have a leak. Most likely spot is the expansion valve, hard to see on the SDL but easy on the W124.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!