I noticed today that water was dripping from the AC drain tube. I never turned on the AC. I did use the heat. I also notice that when I turn the heat on the engine bogs a tad as if I kicked on the AC compressor and I even hear the "Click" like the compressor kicked on. Is this normal? The AC light was not on and it was blowing nice and hot. Does the heated air run through the dryer?

 

for some reason, my compressor always runs when i have it on recirculate. regardless of whether or not the AC button is pushed. even running heat, the compressor can pull moisture out of the air.

 

I wonder if it's because I have "Auto recirculate" selected in my EFI tune....

 

mine did the same thing untill i pushed the button to turn the ac off.
i thought it was off too but my light on the button went out.

 

My light still works. I checked. Sometimes it gives me 3 or 4 flashes and then goes out again. But usually it work perfect, light on, cold air. It just seems as if the compressor is kicking on even when I have the heat on. I might pull the belt and see what happens.

 

I remember reading something that said your a/c is turned on when you select defrost, since it dries out the air.

 

That is 100% correct sir

1SlowHoe, does your ride have Auto temp control? If so, the AC compressor is probably coming on, even if you have the heat on and defroster off, which would be normal operation for that system...pretty sure it uses a thermistor in the cabin to sense the temp and control it accordingly.

 

Defroster or recirculate will turn on the compressor.

 

That's good to know...is that true for 99's also? I hardly ever use recirc, unless I'm driving through a tunnel or Secaucus, NJ (if you've ever been to Secaucus, your nose would know why I use recirc there ). I like to keep it on fresh as much as possible to keep fresh air flowing across the evaporator...helps to keep mold and microbes from building up and creating that musty odor that alot of folks experience from their HVAC system)

 

i don't know much about these systems, but this very thing drove me nuts and quiet frankly robs power and gas mileage IMO at part throttle. I pulled my relay out. LOL I'll put it back in the summer. LOL