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Old 05/17/2010, 08:48 PM   #1 (permalink)
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AC light flashes on and off

Im having an issue with the AC light flashing either when I have the A/C on or when I turn defrost on even with A/C off... any ideas
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Old 05/17/2010, 09:06 PM   #2 (permalink)
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Originally Posted by 04MitsuMac View Post
Im having an issue with the AC light flashing either when I have the A/C on or when I turn defrost on even with A/C off... any ideas
RTF. that flash means something is very wrong with your AC system. take it to a shop. AC is not something you mess around with, inhaling that which is in the system can kill you, and ANY parts you break, accidentally, can prove very expensive. (FYI, your defrost uses the AC, that is why it is flashing too)
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Old 05/17/2010, 11:53 PM   #3 (permalink)
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RTF. that flash means something is very wrong with your AC system. take it to a shop. AC is not something you mess around with, inhaling that which is in the system can kill you, and ANY parts you break, accidentally, can prove very expensive. (FYI, your defrost uses the AC, that is why it is flashing too)
Well it only does it when its raining, especially when I get in with wet clothes after raid on a humid day.... any other time it runs perfectly fine
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Old 05/18/2010, 12:48 AM   #4 (permalink)
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Take it to a shop.....
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Old 05/23/2010, 02:56 PM   #5 (permalink)
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My 02 GT does this too, but will reset itself after the car is turned off. The problem is, driving around town I'll have good, cold A/C for four blocks then it starts flashing and goes warm. So I coast, kill the car, restart it, then I have air for another couple blocks then do it again. The belt is new and it hasnt rained in a week. The current temp is 89. This is really ticking me off.
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Old 05/24/2010, 12:56 AM   #6 (permalink)
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My air conditioning wouldn't go on and the green light was flashing after a servicing. Took it back to them and it turned out to be a plug that they forgot to reconnect. They were able to access the plug from underneath the car when it was on the lift.
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Old 05/24/2010, 10:44 PM   #7 (permalink)
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look in here they have something listed about tthis my gfs car is doing the same thing

Technical Service Bulletins & Recalls
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Old 05/25/2010, 05:05 AM   #8 (permalink)
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Alright guys, let me tell you what the flashing light means. When it flashes, it means that there is either a high pressure or low pressure condition in the A/C Compressor... I tested this theory myself. For instance, if your belt/pulley gets wet while going through a puddle or something and causes it to slip, it may cause a low or high pressure condition causing the A/C ECU to shut down the compressor. The light could signify other things, but I'm pretty sure that is the root cause. Usually tightening the belt fixes the problem. Hope that helps.
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Old 05/25/2010, 02:33 PM   #9 (permalink)
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There could be any number of things that causes the A/C light to flash. I recently had to replace almost everything in my A/C system after the light began to flash, and the A/C stopped working.

Basically, you won't really know what's wrong until you take it to a mechanic that you can trust.
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Old 05/27/2010, 11:15 AM   #10 (permalink)
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Would you look at that...... the fsm has a section dedicated to this problem with step by step instructions. Grab your multimeter

The A/C indicator flashes . Group 55-16
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Old 05/27/2010, 03:28 PM   #11 (permalink)
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Very simple, you wondering why is flashing particular when is raining right?, your drive belt is loose and when it get wet lose wrap with the pulley and then your ligh star flashing, just replace your belt and that will be the end of your problem.
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Old 05/27/2010, 03:30 PM   #12 (permalink)
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Quote:
Originally Posted by Solar Klipse View Post
Alright guys, let me tell you what the flashing light means. When it flashes, it means that there is either a high pressure or low pressure condition in the A/C Compressor... I tested this theory myself. For instance, if your belt/pulley gets wet while going through a puddle or something and causes it to slip, it may cause a low or high pressure condition causing the A/C ECU to shut down the compressor. The light could signify other things, but I'm pretty sure that is the root cause. Usually tightening the belt fixes the problem. Hope that helps.
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Old 05/27/2010, 03:59 PM   #13 (permalink)
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mine did the same thing turned off the car for awhile checked everything an started it up then ac on everything was ok but for your issue take it to the shop if it blinks crazy like that
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Old 07/06/2010, 07:58 PM   #14 (permalink)
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i just got that fixed it took me various trips to diferent shops and i fixed myself ,,,, all the rpoblem was the relay for the ac ,i spent like $15 i got the relay at dealership hope that fixes your problem ,,i spent like $400 replacing the compresor and recharging theope it works good luck ac h
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Old 07/08/2010, 03:32 PM   #15 (permalink)
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Any chance you have a part number for that relay? I am in the middle of the same crap right now.
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Old 07/15/2010, 04:47 PM   #16 (permalink)
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The other day I was driving and it starts pooring rain and guess what happens. Yep Blinky blinky. i say

+1 to wet pulley theory
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Old 07/17/2010, 09:13 AM   #17 (permalink)
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In my case it is not a wet pully as it does it in the dry too. Even after replacing the revolution sensor it still fails.

I can see the magnetic clutch not engage when it should. I even tried switching the relay with the horn relay as it is the same.
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Old 04/25/2012, 06:01 PM   #18 (permalink)
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ok so im having the same problem today, but after stopping opening the hood and make sure my serpentine belt is tight, the light stopped flashing... any insight on this problem? (my check engine light is also on, it still is)
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Old 07/30/2012, 09:16 AM   #19 (permalink)
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Eclipse AC Light Flashing

I know this thread is probably dead... but My son's car started doing this out of the blue... Checked here all everyone's input and possible fixes... Although good advice and places to start... There's one more to add... There is a 3 wire, wire harness in black plastic or rubber tubing leading from the front of the compressor up to another wire harness sitting at the top of and to the right of the power steering pump. Which sits right above the A/C compressor. What we found is that over time the harness heats up and/or the clip releases and the harness falls forward about 2 inches.. Just enough for the fan blade tips to rub a section. I found the fan had come in contact here and rubbed a nice 2-3 inch section all the way down to the wire. Almost severing 2 of the 3 wires... All I did was cut 2 new sections of wire and add them into the ones that had been shaved down to 2or 3 wire strands.. Wrap everything up... and Viola !! the compressor stays on and the light no longer flashes...

So, while a high/low pressure, revolution sensor, belt tension, bad compressor, spacer scenario could be the issue? might as well check the wire harness while your in there.. could save you a ton of money and time...
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Old 07/30/2012, 03:28 PM   #20 (permalink)
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Old 10/01/2012, 08:55 PM   #21 (permalink)
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My AC light was flashing, and the AC has not worked for a couple years now. Followed the Tearstone troubleshooting and was unable to hear the compressor clutch pull in when I energized it directly from the battery. I was going to replace the compressor, but saw another post on this forum that mentioned removing the shim between the compressor pulley and the compressor. All you have to do is remove a few plastic pieces to get at the compressor. Then a 14mm socket to remove the compressor pulley. The shim is directly behind the pulley. I reassembled minus the shim, and the AC works like a charm. The back of the pulley that acts as a clutch plate must have been so worn that it would not pull in tight enough to engage the compressor. Very easy and inexpensive fix.
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Old 06/06/2013, 07:33 PM   #22 (permalink)
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Originally Posted by Iceman77 View Post
My AC light was flashing, and the AC has not worked for a couple years now. Followed the Tearstone troubleshooting and was unable to hear the compressor clutch pull in when I energized it directly from the battery. I was going to replace the compressor, but saw another post on this forum that mentioned removing the shim between the compressor pulley and the compressor. All you have to do is remove a few plastic pieces to get at the compressor. Then a 14mm socket to remove the compressor pulley. The shim is directly behind the pulley. I reassembled minus the shim, and the AC works like a charm. The back of the pulley that acts as a clutch plate must have been so worn that it would not pull in tight enough to engage the compressor. Very easy and inexpensive fix.
A/C Flashing Light Fix

possible fix... added pic's and write up to this thread... linking this in case someone is searching for the problem where the green light is flashing...
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