only when the vehicle is at a stop, or warming up
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1995 Mercury Villager Question: smell of exhaust when heater runs
Answer #1DaveJHM November 22, 2010, 22:24Master
Check for an exhaust leak - at the engine to exhaust manifold, or somewhere in line on the exhaust system. Your heater is likely picking up the exhaust leak as it takes in air form the outside to circulate in your van.
Answer #2tinkertoy November 11, 2011, 11:27Enthusiast
Probrbly has at least one broken/missing exhaust manifold bolt.