I have a Focus 1.4 cl 03 reg with 110000 miles on the clock, for the last few months I get an eggy smell coming from the heaters when moving. I have checked the battery and the cells have enough distilled water. As its a bog standard car it has no A/C. Could it be the cat going, if so how can I check? Also I have never changed the pollen filter.
It is common that a pollen filter smells like egg when funges has grown on it and requires changing,
If the car wasn't a ford, id say change the filter yourself,
But ford pollen filter housings can leak if not resealed correctly and some filter changes require seal change too.
So for this id take it to the dealers atleast then if it leaks then you get a free interior vallet