Trying to track down why A/C light is flashing sometimes on

my 2006 Tacoma 4.0. Question is where would the ground for the compressor be located at ? Have eliminated the relay under the hood. Was also told that serpentine belt could be stretched causing this. Trying to start out with least expensive items before I go into putting electronics that start out with a cost in 90 bux range. A/C is fully charged with Freon



Larry

 

https://www.tacomaworld.com/threads/a-c-light-blinking-troubleshooting-guide.440200/

 

Issue on my 05 was fan speed dial was making poor contact which caused AC to go off because it thought fan was off. On rough patches of road it seemed to blink. I bent the tabs behind dial slightly to contact better and put some electric grease and it was fine after that.

 

What did the electric grease do? I don't think I know what it is.

Was it Dielectric grease?

 

To make electric grease, you have to start with pure electric. After it cools, it gets mixed a pure base lubricant.

 

Yes. It was obvious there was some already but it had some dust/particulate so I cleaned it and put on a fresh layer.

 

Sorry, I was being sarcastic in my first post. The dielectric grease is a pet peeve of mine. Many people use it for what you described even though it does nothing for electrical conduction it only keeps out the moisture.

You know that dielectric grease doesn't aid conductivity. It is an insulator and is supposed to be used on rubber seals on the connector and not the contacts.

Dielectric grease.
Dielectric grease is electrically insulating and does not break down when high voltage is applied. It is often applied to electrical connectors, particularly those containing rubber gaskets, as a means of lubricating and sealing rubber portions of the connector without arcing.

 

Yeah. Might've been No-ox. Don't remember. Been some years. Point is it worked.

I put on some form of goo intended for electrical stuff.

 

Really guys, guy asked a simple question. Here is ground wire, on my 2006 pic of mine 5 mine taken 5 mins ago. Ask a friend with gauges, or maybe borrow from autozone check freon before you start openning up the system.

 

Thanks for taking the time to post pictures,I greatly appreciate your time

 

ok guys, update on what my AC is doing, I live 26 miles from my job and sometimes when I come out from work headed home I will turn AC on in truck and it will not go off for 24 miles or so. Seems like if I hold truck at certain speed/RPM the AC seems to work as it should. Sometime if I hit a bump it goes off. Then some times i come out and head home and turn on AC and it starts to flash immediately and does that all the way home even with me turning it on and off. I have eliminated the relay possibility, could the serpentine belt be the problem ? I have went to the post about AC flashing (someone gave me the link in this thread) have check freon and its fine. Cant seem to find the other plug the poster put in his right up. Will continue to search for that. I have priced the part that poster said wound up being his problem but havent purchased yet. Just confused as to why it will work for 30 mins non stop and then others its on 3 mins or so.



thanks

Larry

 

Sounds like it's a compressor pick up sensor. Mine had the same problem.

 

ok kinda of update, yesterday I drove around pulling my boat and odd and end honey do's and never exceed 55 mph and my ac light never went into flashing. Got on expressway and moved up to 65 and the light then went to flashing. I am goin to replace serpentine belt, I have already put relay and had freon checked and all that is fine. I dont know how long it has been since belt was replaced (bought taco used) so I know that wont hurt anything. Next move it the part down by compressor but thought I would wait until new belt in place and see if it just might be the belt slipping at higher rpms. Anyone ever had a belt to cause the AC light to flash ?

Thanks

Larry

 

FWIW, I had mine flash for the first time this past Saturday. I was headed into work and had the windows down (a/c off) all the way until I entered the toll road. As I was going up the on ramp I turned on my a/c and noticed the light started flashing. I turned it off and back on a couple of times and the light stayed on. I'm borrowing some gauges to start with checking pressure and go from there. I've read it possibly could be the compressor clutch? I have ruled out my belt as it was just replaced less than 15,000 miles ago.

 

UPDATE ! I put new belt on truck and the AC worked pretty good for awhile. Now it has began to flash again, notice yesterday while going down interstate that if I kept RPMs at 3k or better by not running in OD the AC would work and no flashing. So with the relay, belt replaced and freon checked in AC, I guess next step is the sensor that is mention in other post about this. Trying to narrow down because I have to order the sensor since no dealer with in 75 miles stocks that part. Heat is a killer down south right now (as well as most of the US) and got to get to bottom of problem

Thanks to all that have helped


Larry

 

My vote is either a wiring connection failing (unlikely, but possible) the hi/lo sensor failing (rarely an intermittent failure item) or the clutch is failing. Which eventually will quit altogether.

This thread, post 8,10,11 and 19 might be useful to you.

Post 19 contains a link to a great thread on the replacement of the clutch, which can be DIY, no AC service work needed.

https://www.tacomaworld.com/threads/blinking-ac-light-please-help.105164/

 

The compressor pick up sensor is on national back order i just found out