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elmariachi
New User
Jul 30, 2012, 9:58 PM
Post #1 of 4
(8376 views)
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Blinking AC button
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2003 Toyota Sequoia
4.7L V8
~130K miles
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.
I changed the relay and still no luck. Anyone else have any ideas? Everything on the net says it's the relay or clutch and having changed both it still doesn't work. Will blow cold air for a ~6sec then the light starts blinking. I'm hesitant to change to compressor since it does blow cold air. The compressor spun freely when I was changing the clutch so I don't think it's a seized bearing.
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.)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 31, 2012, 3:28 AM
Post #2 of 4
(8340 views)
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Re: Blinking AC button
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You're getting some bad information.
That system uses an RPM sensor in the compressor to tell the control head what is going on and the control head will shut the system down accordingly. Most anything can trigger a shutdown.
This needs to be diagnosed by an A/C specialist as it will be very hard to pinpoint correctly.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 24, 2012, 7:25 PM
Post #4 of 4
(8241 views)
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Re: Blinking AC button
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That's right. A bad clutch, loose belt, binding compressor from high pressure, bad RPM sensor, bad control head or any related wiring will all have the same result.
This question has been dead for a while so we should be staying away from it now.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Aug 24, 2012, 7:26 PM)
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