Re: first of all use foam cleaner
Thanks Shogun. I will remove the blower assembly so I can really see down in there, check for mouse parts, and heavily foam the back of the evaporator and everything else I can reach. What type of foam can you suggest.
What I can't understand is the it smells very much like exhaust or crankcase odor. There are no exhaust system leaks and no firewall leaks. It is definitely coming theough the heater box.