I may be facing the same issue, but sadly when I test my relay with a volt meter, it works. Apply 12V across the silver leads and continuity across the brass leads. Cycled it a few times, and worked every time. Guess I have to chase things down a bit. Don't have many options on my vehicle such as inverter, so can't easily swap around in the relay block to field test. Other thoughts are welcome.
A/C Light Blinking on 2003 LTD
- Thread starter bluduk15
- Start date
Ha! Always confirm tests. So when I set up my rig to test the relay, I had my voltmeter using some old alligator clips that I thought were sketchy. Energizing the relay with a 12V DC bench source, the switch side of the relay went from 1 (open) to 140mV/ohm Figured it was the dicey leads I was using. This is the black relay, btw -- not the beige ones.
For kicks, I swapped out the relay for the front defog in my test rig. Ooooh, 11.4mV/ohm. So popping in the second relay, A/C works fine.
Just goes to show even testing needs to be double-checked.
Bad DNA
For kicks, I swapped out the relay for the front defog in my test rig. Ooooh, 11.4mV/ohm. So popping in the second relay, A/C works fine.
Just goes to show even testing needs to be double-checked.
Bad DNA
As you can see from my time-stamps, I was motivated to solve this quickly. A trip to Autozone here locally, their part #35874 for $13.99, the identical relay to the one I pulled. Installed it and A/C is once again happy. Thanks for the group think on this -- very nice to have resolution. Now off to replace the failed backlight lamp on the clock side of the instrument center panel.
ricksxfile
New member
AC Not working and swapping relays
Great idea gentlemen, worked on my 2003 T4R swapped the Dome relay which was the same model # 90987-02022 as the MG-CLT relay and the air conditioning has been working fine. Did not require any clutch adjustment or freon download. Will be replacing the one relay that I know is now bad, however , the dome lights are working with no issues. Thanks for your support!
Great idea gentlemen, worked on my 2003 T4R swapped the Dome relay which was the same model # 90987-02022 as the MG-CLT relay and the air conditioning has been working fine. Did not require any clutch adjustment or freon download. Will be replacing the one relay that I know is now bad, however , the dome lights are working with no issues. Thanks for your support!
gjv200
New member
Just wanted to bump this topic again... same thing happened to me as it did everyone else on the thread (at 135k miles). Panicked at first, then came here and did 2 minutes of searching.
A quick Google led me to a replacement part at my local O'Reilly's... $16 and 5 min later, my AC was back up and working.
Thanks to everyone for their help on this!
-G
A quick Google led me to a replacement part at my local O'Reilly's... $16 and 5 min later, my AC was back up and working.
Thanks to everyone for their help on this!
-G
vn_aviator
New member
I had this problem in 2011. I went in here and found the answer. I bought the new relay and it worked fine. Now, 5 years later, it blinks again. Should I buy another relay or is it something else and not the relay? Thanks!
I did sir .. The reason I couldn't find it anywhere is because it doesn't exist lol. Thanks for your reply. Have a great week!
Spot on sir! Found most modern vehicles dont have sight glass anymore. Taking it to shop to get lvls checked. Thank you for ur reply
I have a 04 4runner sport with the AC light blinking. I have replaced the relay switch twice just to make sure the first one I baught was not faulty. The light still blinks. the system is fully charged and the compressor clutch kicks on for about 5 seconds then shuts off and then the light in the cab starts blinking. Can anyone direct me on what to try next? Any help would be greatly appreciated.
I know this is an old thread but one to which I never said "thank you". I was driving across country, moving from Md. to Az. in the summer of 2013 when the A/C light started flashing and no A/C. I went to a dealer in Knoxville, Tn, my first night of stopping and was told my compressor was shot, new one was $1200 installed 
. Decided to go online and research the issue and found this thread. Swapped two of the relays in the box and once again had A/C. Called the same dealer and they said such a failure was very rare but the relay would be $180 to replace . Went to the Advance Auto down the street from the hotel, bought the aftermarket equivalent for $9 and is has worked to this very day. So because of this forum, went from a BS quote of $1200 to a slightly less BS quote of $180 to $9. I really needed that A/C through Texas, NM, and Arizona. So even though it's many years late, my thanks to the people who started this thread and figured out this problem to begin with.
. Decided to go online and research the issue and found this thread. Swapped two of the relays in the box and once again had A/C. Called the same dealer and they said such a failure was very rare but the relay would be $180 to replace . Went to the Advance Auto down the street from the hotel, bought the aftermarket equivalent for $9 and is has worked to this very day. So because of this forum, went from a BS quote of $1200 to a slightly less BS quote of $180 to $9. I really needed that A/C through Texas, NM, and Arizona. So even though it's many years late, my thanks to the people who started this thread and figured out this problem to begin with.
