YEs, you do have a leak some where. Luckily you can test all the systems from underthe hood. Lots of time you will find the rubber joiners will crack and leak. Under the hood, Yellow is locks, green is HVAC, brown is the engine shut off.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D