Cleaning the evaporator does clean the drain.You should do a little more than that.Make sure the evap drain is free of debris and lets water out,also you should replace the cabin filter and if health is a concaern replace it with a carbon one(healthwiseautofilter.com),have been useing at my shop for a while.Check them out.
Actually, the cleaner expands and completely engulfs the evaporator core and the evaporator case. Even a plugged drain gets cleared by installation of the cleaner. Of course when the cleaner and contaminants run out, it also helps to clean the drain.generaly cleaning through the drain does not cover the complete evaporator but if you do it that way the drain should be clear.
Actually, it's not an A/C filter as many people call it. It's a cabin air filter. It filters air that enters the cabin. Actually, it's not part of the A/C system. Are the cowl vents considered an A/C system part because air enters there? No, they're not. Is there a seperate filter for the heater? No.But i guess trd vvti didn't know the cabin filter is part of the a/c system.And bye the way trd vvti I am a tech.Hope every ones up to date on a/c systems.
Do you mean if we use the a/c correctly, it will not need service or refill refrigerant, and it should as cool as new even after 10 years?If you only do ONe thing to the a/c, the right answer is to maintain the A/C just USE IT. Thats all you REALLY have to do - use it AT LEAST every two weeks, turn it on for at least twenty seconds (so says toyota).
you know the couple ounces of special oil that gets dumped in with the refrigerant, well this oil is what keeps the bearings and seals from drying out and wearing out. The only time the refrigerant oil circulates is if you run the air conditioning. (Yes, even in the winter you should do it - the car's cold in the morning anyway right).
If you go too long a time, like in the winter, without turning on the air - guess what, your air might not work cause the seals and bearings are dried out and no good anymore. On my Dad's old 1982 Dodge Mirada 318, the A/c belt snapped when he went to turn it on. The compressor had seized because he didnt use it for a long time.
So just use the A/C every two weeks, or better yet every week, and the a/c will last you the longest. And refrigerant doesnt wear out so it doesnt need to be changed ever. (I have a type I II and III refrigerant handlers license and a little knowledge of this stuff). the only time refrigerant gets serviced is when the air quits working and the tech goes in to fix something else and has to open the system.