Strong exhaust fumes when heat or A/C is on

Tiny
PATTY FREY
  • MEMBER
  • 1988 LINCOLN TOWN CAR
  • 0.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
Why do I smell strong exhaust fumes when I run the heat or A/C? No check engine light on.
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Wednesday, December 12th, 2018 AT 6:22 AM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

Do you have any exhaust leaks in the system? A leaking exhaust will allow exhaust fumes into the car.

https://www.2carpros.com/articles/how-exhaust-systems-work

Are you sure it is not raw gas fumes? If it is, then you have an external fuel leak which must be addressed immediately. That is a big risk for a fire.

When you have the AC or heat on, it pulls in air from the outside and that is why you smell the fumes.

Roy
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Wednesday, December 12th, 2018 AT 6:49 AM

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