The AC button on the dash of my 2003 Sequoia has starting blinking. When I press it on it will start to blow cold air but after about 5 seconds it will start to blink on and off and the cold air will stop blowing (air continues to blow). I've searched the web and found two likely causes the ac compressor clutch and the Magnetic Clutch relay. Several post I found said to take out the relay and tap it on a hard surface to get it "unstuck". This didn't help in my case. I also swapped out the mag. clutch relay with others found in the various fuse boxes. None seemed to fix the situation.
I then swapped out the clutch hoping this would fix my problem. No luck there either. The problem still persists as usual. I can hear the clutch kick in but after a few seconds it disengages and doesn't come back on.
Does anyone have an idea for a new area to look at. The ac does blow cold air. If I keep pushing the button back on after it starts to blink it will blow cold air, but as soon as the clutch disengages it will start to blink again. This gets old pretty fast. Sometimes after doing this a few times it will fix itself and stay on until we shut-off the car. I guess there is a possibility that the relays I swapped in are going bad too, but there doesn't seem to be a problem in those components they (i.e., the horn, fog lights, etc.)
Any help would be appreciated