So you think that the freon never has to be changed? That's like saying I will never have to change the oil in my engine... It's maintenance free.

 

geez i appreciate all the replies but i think you all need to read my original post again,,,i have air coming thru dash vents when everything is off AND both heater hoses are always hot to the touch ,,,,whats the deal ??? i dont need to know about freon recharging and other stuff if my only problem is a "blend" door issue

 

ps it does this and i am not in vent mode AND elec fan does kick on

 

Sorry Jomo,

Back to issue at hand, if you are getting air coming out of your vents and your a/c controls are actually turned off, it may be your blend door not shutting out all the way. Thus, you are getting a mix of cold air and outside air when using A/C.

There is no way to check the blend door without having to remove your steering column and tear down the dash.

If you decide to go this route, make sure to inspect the A/C coil and heater core to see if it needs replacement, otherwise, you will get charged again to tear down the dash and and steering column to get access to the A/C-Heater assembly.

As far as heater hoses, it is normal for both heater hoses to be hot. Antifreeze is continuously flowing thru the core all the time. The blend door controls the air mixture between the heater and A/C coils. If ever you are not getting hot air in the winter, just feel the two heater hoses, if one hose is much cooler than the other, it is a indication your heater core is clogged and needs to be flushed. If flush, make sure you do a reverse flush and not use too much water pressure as you can increase the likihood of bursting the core. To make sure you do a reverse flush, apply the water hose to the hose that is cooler than the other.

 

DRO,

That is a VERY correct statement. Think about this, do you ever have to change and refill freon in your refrigerator every year? Your home refrigerator runs at least 10-12 hours per day for the life of the refrigerator. Or even Home A/C units, do you have to refill and change freon every year also given if you don't have any leaks or problems?

Freon based systems are maintenance free and never needs internal maintenance. Freon will last forever given a healthy operating compressor and no leaks.

 

I can say sorry but I have had instances were I had to get a deep freezer freon drain and refill, window ac needed freon, and apt ac freon recharge, and last my past 6 vehicles. So I know it needs maintenance some day

 

That is true only if the system has been breached (AKA: leak)

 

All I know is, the only thing I don't agree with is that, if you have a clog in your heater core, one hose will be hot and the other cool... I felt both of my hoses and they were both hot to the touch... Both were reading around 175 surface temp of hose... Awsome thing, I was getting a whopping 90 degree air out of the vents on a 85 degree day... Not much of a heater if you ask me... Did a flush and now that air has jumped to 165...

As for the airflow with the system off... What are your other conditions? Do you have your windows down? Are you driving? Staionary?

I have found that when I have my window cracked and the system off, I will still get a breeze out of the vents starting at about 15-20 mph...

 

so kensai i guess if i am getting air out the vents it needs to go to a dealer for the blend door????

 

windows closed or open air coming thru vents on the highway ,,, why would an open window cause vents to push air??? if you are think lower atmospheric pressure in car because window is open that would be the opposite of how physics of airflow design work