s Auto Air Parts - Eliminate foul odors from your auto A/C System. Are these odors making you sice? Find out what causes them.

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Are foul odors from your auto A/C System making you sick? :
It's a common problem. What's worse if that most service shops don't have a reliable solution. Understand how the air flow works in your auto A/C system and you will quickly see how you can easily eliminate those foul odors.
Foul odors from an auto A/C system is actually a very common problem. It's also quite simple to solve, if you know how to get to the source of the problem. Countless 'fixes' promise to remove the odor, but only mask them.

Understand first of all, that any product you spray into your dash vents or apply from inside the car will only mask the odors. They will not solve the problem, that's for sure.

The problem starts at your auto A/C evaporator. More specifically, it starts on what is known as the 'air side' of the evaporator. That is the side that faces the incoming air. What you may not know is that all of the air that enters into your vehicle MUST pass over the evaporator first. Regardless if you're calling for cooling or heating, all of the air entering your vehicle passes over the evaporator first.

The typical auto A/C system (or MHVAC... mobile heating, ventilation and air conditioning system) is actually a 'series re-heat' system. That means all the air entering your vehicle passes over the evaporator first. If you're calling for cooling or A/C, the air enters directly into your vehicle passenger compartment after passing over the evaporator. If you're calling for heat, then the air is directed from the evaporator to the heater. Then it enters your car as heated air. In the event you are calling for something between full heat of full cooling, then some of the air is directed right into the car while some of it is directed over the heater. The air mix provides the comfort level that you select.

To best illustrate this, we've included an illustration (below) of a typical auto A/C system air flow diagram.

Air flow in the auto A/C system:
As mentioned above, all the air entering into the vehicle is directed over the A/C evaporator first. From there, it's either sent directly into the vehicle (for A/C cooling) or directed over the heater for heat. When mid range temperatures are required, the air is mixed; some enters directly from the evaporator while other air is directed over the heater.
This illustration shows the actual inlet air flow of a typical auto A/C system. Notice that from the blower motor (bottom right of the illustration) all air passes over the A/C evaporator first! Then it's directed as required for cooling or heating.

Keep in mind that when the auto A/C system operates properly, the evaporator is always wet with condensation. That's the moisture in the air that is being removed as the warm air hits the cold evaporator. Additionally, the evaporator case is completely enclosed; therefore it's a dark and damp place.

Now, consider the air that is being directed into your vehicle. All of the airborne pollutants are pulled into the evaporator air inlet by the blower motor. The wet evaporator face makes the idea 'filter' for the air, leaving all the debris and pollutants trapped.

In addition to that, if you routinely park under trees, it's typical to find dried leaves in the evaporator case too! With a combination of the air born pollutants, leaves and any any other contaminants in the air, it's no wonder the evaporator case quickly becomes a breeding ground for mold, mildew, spores and bacteria.

This illustration shows a different view of a typical auto A/C system and the air distribution. You can quickly see where the odor problem occurs on the air side of the evaporator. You can also quickly see how spraying anything into the A/C system vents will not solve the problem. It will only mask the odor.

The Solution:
Treating and eliminating odors from your auto A/C system:

The only way to resolve the problem of odors from your auto A/C system is to get directly to the root of the problem. Evaporator treatments available on the market can do just that. The reason we say 'can', is that a lot of products sold as an odor treatment are still applied through the vents. By know you understand that anything applied through the vents will not solve the problem. Therefore, getting an odor treatment that's applied directly on the face of the evaporator will help eliminate the problem.

The A/C Evaporator Treatment does just that. It's a complete single can application kit that includes a 30" spray wand that let's you get directly to the air side of the evaporator - exactly where the problem starts.

The illustration on the left shows a typical application of the A/C Evaporator Treatment. This particular product formula is a triple action foaming formula. It helps to sanitize, protect and eliminate odors. In the photo you can see how it works in a cut away evaporator case. The application spray wand and brass spray nozzle applies the product directly to the air side of the evaporator. Within minutes the foam is reduced (to drain out your evaporator drain) and the auto A/C system operation is restored.

Applying the A/C Evaporator Treatment :
This product is easy to install. Simply locate the evaporator case from under the hood. The evaporator is usually on the passenger side of the vehicle. The spray wan has to be inserted (through any opening) between the evaporator and the blower motor. That assures you are applying the product to the air side of the evaporator. If an opening is not available, you can loosen the blower motor housing and route the application hose into the evaporator case that way. The spray wand is only 3/16" of an inch thick, so just about any opening will do.

In alternative cases, where no opening is available, you can CAREFULLY DRILL A 1/4" HOLE into the evaporator case. CAUTION must be used as drilling into the evaporator will cause a leak that is probably not repairable. With a small 1/4" hole in the air side of the evaporator, you can easily thread the application hose into the evaporator case. Once completed, simply use a 'puddy' to cap the hole.

From our experience, one application will usually last between 3-6 months, depending on how contaminated the A/C evaporator is. Your particular results may vary.

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From the world's leader in auto A/C service information - autoACsystems.com

Are foul odors from your auto A/C system making you sick?
It's a common problem but if you're not getting to the source of the problem, you will only mask the odors. See why your A/C system develops these foul odors and how you can easily eliminate them!
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<FONT face="Verdana, Arial, Helvetica, sans-serif" SIZE="2" COLOR="#000000"><B><A HREF="http://www.autoacsystems.com/_faqs/detail/odors.html">Are foul odors from your auto A/C system making you sick?</A></B><BR> It's a common problem but if you're not getting to the source of the problem,  you will only mask the odors. See why your A/C system develops these foul odors and how you can easily eliminate them!</FONT>

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