Does the car have an aftermarket "rust or noise proofing" material applied to it?
Also, it it the original expansion valve? It could also be lots of oil residue and road grime mixed together over the years.
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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.
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