If you spray water on the condenser and your performance (vent temps, pressures) improves, that indicates insufficient air for the pumping available. A 240D "main fan" is direct drive (no clutch)?

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James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
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1987 300SDL junker 170k
1982 300SD junker, 265k