At least I hope it is. Anyway during cold weather when I used to start the 83 300D up first thing in the morning, I could press the defrost or any other button on the climate control and I would get slightly warm heat right away that would gradually get warmer as the motor warmed up. Now, I don't get that heat until a few minutes have passed and the motor starts to warm up.

I used to remember what might cause this, but for the life of me, I cannot remember now. Any tips on how to troubleshoot and fix?

Thanks

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)