what is causing the smell

1998 DODGE CARAVAN
99,000 MILES
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TREETOP120456
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the van is leaking either fuel or exhaust into the passenger area it is strongest when the van has run for a while and the defrost is selected It doesn't smell when the recirulation or the A/C button is on. 2 injectors have been replaced.
Jan 13, 2012 at 2:46 AM
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RASMATAZ
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Could be coming from the evaporative control system thru vacuum lines to the vacuum operated actuators in the AC/Heater components or the firewall is leaking-Have it detected with a gas analyzer
Jan 13, 2012 at 3:05 AM