2000 Chevy S-10 engine fumes while heater/ac is running

2000 CHEVROLET S-10
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ALBERTO ROSA
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Smells problem
2000 Chevy S-10 6 cyl Two Wheel Drive Automatic

While the AC/Heater is working I smell engine fumes coming thru in to cab
Nov 9, 2009 at 10:09 AM
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JACOBANDNICKOLAS
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Does it smell like gas, exhaust, oil, coolant...?
Nov 12, 2009 at 8:02 AM