Try to remove it without taking the heater hose off. Keep working it.
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Old enough to know better, Too young to resist. 1990 w250 CTD LE reg cab. Straight piped 3.5''. A-727 tranny. 249,000 miles. All STOCK! Gauges - EGT, Boost, Tranny, Tach, and Fuel Pressure. Soon to experiment with, Waste Vegetable Oil.