Cadillac Seville / Cadillac Eldorado Forum Discussion, Heater on... burnt oil smell? in Past Cadillac Vehicle Discussion; I just made the correlation. When the heater is on, (obviously when it's cold outside) the car has more of ...
Automobile(s): White Diamond '03 DHS (with floor shift)
Re: Heater on... burnt oil smell?
Look closely at the HVAC box mounted on the firewall. They have been known to become brittle and crack. Even had large pieces fall out. If that happens, you draw underhood air to heat the cabin. If you have a leaky cam cover or such, that smokey air is being pumped into the cabin.