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Q:

smell of exhaust when heater runs on 1995 Mercury Villager

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
only when the vehicle is at a stop, or warming up
(2) Answers
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.
Probrbly has at least one broken/missing exhaust manifold bolt.