I have a 2005 4runner V6 . My a/c light is flashing and no, it's not the freon and it is not the mc relay as I swapped relays with the fog light relay and it still does the same thing and when I put the mc relay in the fog light spot , the lights work. So it's not the relay (which I hoped it would be because it's such an easy fix) When I turn on the ac , it will come on for exactly 5 seconds with cold air, then light starts blinking. Compressor does come on but shuts down when light starts blinking so I assume that computer is telling compressor to shut down. I was told that it is probably the rpm speed sensor causing this. Also I was told that there are 2 types of compressors , 1 has this sensor internally (which means replacing compressor) and 1 is external. I can't get a straight answer from dealer on where to look for the sensor on my 4runner (they want me to take it in of course) and diagrams don't tell me much either. Anybody come across this or know where to look for this sensor? Or any other thoughts?
A/C Problem Please Help!!
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Brian_F_Colgate
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An alternative solution
I read previous posts so took the initial steps of changing the cabin air filter, and swapping the two relays as you did -- the fog lights still worked so that wasn't it -- and took it to my usual shop to have the freon checked. It was fine -- it had been topped up last summer, perhaps for the first time since 2003.
The tech noticed the compressor was not coming on so he dug around a bit. There was a ground from the compressor to a bracket below it; he said that bracket was heavily rusted. He ran a new ground lead to the block and everything is A-OK.
F.Y.I.
I read previous posts so took the initial steps of changing the cabin air filter, and swapping the two relays as you did -- the fog lights still worked so that wasn't it -- and took it to my usual shop to have the freon checked. It was fine -- it had been topped up last summer, perhaps for the first time since 2003.
The tech noticed the compressor was not coming on so he dug around a bit. There was a ground from the compressor to a bracket below it; he said that bracket was heavily rusted. He ran a new ground lead to the block and everything is A-OK.
F.Y.I.
Compressor
Update: Finally broke down and replaced compressor. Had it recharged and now I have cold air again! Although it probably wasn't the compressor itself but the rpm sensor that is internally in the compressor. And the only way to fix it is to replace the whole thing
but just happy its working again!
Update: Finally broke down and replaced compressor. Had it recharged and now I have cold air again! Although it probably wasn't the compressor itself but the rpm sensor that is internally in the compressor. And the only way to fix it is to replace the whole thing
but just happy its working again!