Civic vti 1999.
I have a small leak in my manifold and mechanic told me if you’re worried about smells just set in on recirculate. I have done and I’m assuming this means no outside air should come through the hvac system regardless of whether your ac is on it the fan is on? Am I correct about this?
My problem is whenever I put the fan on I can smell what I think are exhaust gases coming through the vent. It gets stronger the more I higher revs I drive it on. At low revs I can’t really smell it.
Am I right that recirc should not let anything to be drawn in, and if it’s exhaust gases I’m smelling how might these be getting through/what do I need to look at?