Ford Workshop Service and Repair Manuals

NOTE:There are typically 4 types of objectionable odors found in a vehicle:

NOTE:Before determining that A/C odor treatment is required, the source and the circumstances under which the odor occurs must be determined.

NOTE:Chemical odors are usually constant regardless of the climate control system setting although they may be enhanced by A/C operation. Most chemical odors are caused by fluid leaks or incorrectly cured adhesives. Chemical odors can be eliminated by repairing the leaking component and removing any residue.

NOTE:Environmental odors usually occur for a short time and diminish after the vehicle passes through the affected area. These odors are typically only detected when the vehicle windows are open, or when the climate control system is operating in a mode that allows for fresh air. Environmental odors cannot be eliminated because they are external in source, but they may be minimized by switching to a climate control setting that uses recirculated air.

NOTE:Human and other interior generated odors occur while the source is present and may linger for a short time after. These odors may be more noticeable during A/C operation. Human odors may be eliminated by removing the source and cleaning the affected area.

NOTE:Microbiological odors, if in the A/C system, usually last for about thirty seconds after the system is turned on. They will be detected while the A/C is turned on using either outside or recirculated air. Microbiological odors that occur in areas other than the A/C system (e.g. water in doors or wet carpeting) may last indefinitely, and will be more intense when recirculated air is used. Microbiological odors will not be present at temperatures at or below 10°C (50°F).

NOTE:Microbiological odors can be eliminated by removing the source and treating the affected area. Standing water must be allowed to drain and dry out. A/C systems may be treated by using the A/C cooling coil coating as described in the procedure below.

NOTE:Microbiological odors result from microbial growth supported by warm temperatures and moisture. Microbiological odors are described as musty/mildew type smells and may occur on/in: