The majority of the comfort does not come from cooling the air. It comes from removing the humidity. That's why air conditioner compressors run in winter when we select the "defrost" mode. It removes the humidity so it does not condense on the cold windshield.
That condensation is the water you see running out of the drain tube and onto the ground just left of and behind the right front tire when the system is running in the summer. That water on the evaporator traps pollen and dust, and those get washed off as the water runs out. When you pull a heater box apart, the only time you will find built up dust is when the system hasn't been working for years.
The only spray you will find at dealerships for air conditioner systems is an odor neutralizer, and that is only used when mold has formed in the heater box due to that condensate not draining freely. The product is sprayed into the vents from inside the vehicle and into the air intake under the hood or in front of the windshield. When spraying into the air intake, run the fan on the lowest speed to draw the spray in.
Friday, August 19th, 2016 AT 1:03 AM