I have a chevy S10 4x4 4.3 V6 and have oil in the vacuum lines. on 1998 Chevrolet S10

Also the heater will not change from the vents to the floor.

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1 answer 1 comment
how many miles on car? poss vac isue for heater also
The engine and trans. has been rebuild at about 71,000 miles. The truck itself is pushing 160'000 miles.