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740 B234f exhaust fumes coming in from ventilation system 700 1990

I have a 1990 740 b234f with a strange problem. When the car is idling (e.g waiting at traffic lights) there is a strong smell of what smells like exhaust fumes coming into the car via the air vents on the dashboard. This stops as soon as the car begins moving. It is preventing me from using the heater/fan ( has A/C but not working) as it is pretty bad.
Mechanic also seems to be in the dark about the cause. Any ideas anyone?






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New 740 B234f exhaust fumes coming in from ventilation system [700][1990]
posted by  JP240  on Sun Jun 19 02:48 CST 2005 >


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