View Full Version : A/C issue

05-17-13, 08:08 PM
I had forgotten that I had this problem last summer, but it's happened again. Hopefully, it is not a major issue...

When I turn on my car and the A/C kicks in, there is a sound that makes you think that an airplane just flew over the car...lasts about 3 seconds and then it's gone. I don't know if this has anything to do with my car's problem, but I thought it might be worth mentioning.

The main problem is that when driving any length of time (say an hour or 2...or anytime longer), my A/C stops blowing air. I will notice that it gets hotter inside the car and there's no air blowing out of any vents (floor/dash/defrost). I can turn the system to manual and turn up the fan speed and I can hear the fan blowing, but still, no air flow through the vents...I can change where I want the air directed (floor/dash/defrost vents), and still...nothing. If I turn the A/C system off for a while (15-20 minutes or more) and turn it back on, the air will flow again as it should. Same thing if I turn off the car and then turn it on again a few minutes later (i.e. turning off the car to put gas).

I've never had a problem with the defrost function or heat function throughout the fall/winter/spring. This only seems to be an A/C problem. Almost seems as though the system is freezing and by turning off the system (or the car altogether), that it allows the system to defrost and run again. I don't know if this is really what is happening, but it "seems" like that.

Any help would be appreciated in this. Cheers.

05-17-13, 10:35 PM
you're exactly right, the evap core is freezing up on you. check your drain hose under the hood on the bottom of your air box. they sometimes plug up and dont allow the water to drain, hence it freezes and you lose air flow.

05-18-13, 12:23 AM
Thanks for the quick reply...

I just checked...the drain hole is not plugged. And I always get a puddle of water under the car after driving. In reaching under the box, I've found a hole where water comes out...but there's not a hose sticking out of that hole...should there be? Is there a way to prevent it from freezing up if the drain hole is not plugged?

Cheers again.

05-18-13, 07:52 AM
there doesn't necessarily need to be a hose. could your fan clutch on the engine be worn out and not engaging? may not be getting proper flow through the condenser? could be a problem with your cycling switch also.