The Evaporator Core sits inside the Heater A/C case located under the dash behind the glove box (in 90%) of all vehicles and is directly in the cabin fresh air flow in all vehicles that air eventually comes out of the vents and into the air that you breathe while driving. As the Refrigerant (Freon) leaks from the system the blower sends it directly to you and your passengers.

The air we breathe is composed of  21% Oxygen and 78% Nitrogen, but no Freon what-so-ever. This can attribute to allergies, nausea, blurred vision, headaches and I'm sure various other symptoms that usually go undiagnosed by the medical profession.

This leak is usually very small and cannot be found by the untrained, or poorly equipped mechanic and, or shop. The equipment needed is expensive, sophisticated and takes years of training to utilize properly. In most cases the vehicle's A/C system is just recharged and you are sent on your way. I have the proper equipment, training, expertise and experience to find this and any other Automotive Air Conditioning Leak.