A/C light blinking

Tiny
RODNEY7867
  • MEMBER
  • 2000 TOYOTA SIENNA
  • 6 CYL
  • AUTOMATIC
  • 192,485 MILES
A/C runs for 2 minutes, then the A/C compressor clutch disengages, and the light starts to blink. I've checked all fuses and relays, all are good. With the vehicle off not running the A/C compressor speed sensor ohms are 105. I can't find anywhere as to what it is supposed to read. Also, the outside air temperature is 75°.
Friday, June 10th, 2022 AT 12:36 PM

67 Replies

Tiny
JIS001
  • MECHANIC
  • 3,411 POSTS
Hello. I think you ohmed out the compressor lock sensor. See image below and I hope this is what you were searching for. Let us know if this helped.
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Friday, June 10th, 2022 AT 10:01 PM
Tiny
RODNEY7867
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Yes, that's what I homed. Can't seem to figure out why A/C light keeps flashing.
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Saturday, June 11th, 2022 AT 4:41 AM
Tiny
JIS001
  • MECHANIC
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Sorry for the late reply. Verify that you have battery voltage at the clutch. You will need an assistant. If there is a problem with the clutch, you will see battery voltage for a second or two before it goes away. If that happens then the A/C compressor is faulty. I would recommend you replace the compressor with the clutch along with receiver drier.
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Monday, June 13th, 2022 AT 7:29 PM
Tiny
RODNEY7867
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Yes, the compressor comes on for about 2 to 3 minutes, then kicks off and starts blinking.
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Tuesday, June 14th, 2022 AT 5:23 AM
Tiny
RODNEY7867
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  • 70 POSTS
Clutch does engage.
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Tuesday, June 14th, 2022 AT 5:23 AM
Tiny
RODNEY7867
  • MEMBER
  • 70 POSTS
I tried to recharge, but the compressor not engaged long enough to do it.
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Tuesday, June 14th, 2022 AT 5:24 AM
Tiny
JIS001
  • MECHANIC
  • 3,411 POSTS
You may want to start with replacing the magnetic clutch relay as a first step. The contacts could be opening up once the engine bay gets warm.
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Thursday, June 16th, 2022 AT 5:56 AM
Tiny
RODNEY7867
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  • 70 POSTS
Where is the magnetic clutch relay? AutoZone and dealership show it's a 4-prong relay but the A/C relay under my dash on driver side next to fuse box inside is a 5-prong. So, what am I missing?
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Thursday, June 16th, 2022 AT 12:17 PM
Tiny
RODNEY7867
  • MEMBER
  • 70 POSTS
Also, my headlights stay on even when I turn them off. So, I was wondering if the solar sensor affects both the A/C and headlights.
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Thursday, June 16th, 2022 AT 2:13 PM
Tiny
JIS001
  • MECHANIC
  • 3,411 POSTS
I am posting the diagnostic procedure for the compressor. I apologize that I overlooked the possibility that you could be low on refrigerant, causing the clutch to disengage.

I posted how to check the compressor properly. If you can rent some gauges from your local parts store get them and measure the pressures and post them on here. If it is low then following the compressor clutch inspection, you will be able to turn the compressor on so that it can take in the refrigerant. Let us know if you need further assistance.
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Thursday, June 16th, 2022 AT 8:15 PM
Tiny
RODNEY7867
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Okay, I have one question about testing lock sensor resistance. Do I start the van and it's 91 outside so what should it read if it's supposed to be running or turned off?
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Friday, June 17th, 2022 AT 9:44 AM
Tiny
JIS001
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Vehicle off. Let me know what you measured.
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Friday, June 17th, 2022 AT 12:34 PM
Tiny
RODNEY7867
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Okay, I will test when I get off work.
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Friday, June 17th, 2022 AT 12:38 PM
Tiny
RODNEY7867
  • MEMBER
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Ohms read 113.9 at outside temperature 85 ° f.
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Friday, June 17th, 2022 AT 5:04 PM
Tiny
RODNEY7867
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I have to wait to get gauges, out of money.
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Friday, June 17th, 2022 AT 5:05 PM
Tiny
JIS001
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The reading is good. As for gauges, I thought AutoZone or Oriley's would let you borrow them?
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Friday, June 17th, 2022 AT 7:33 PM
Tiny
RODNEY7867
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They do but you have to rent them then when you return them you get the money back. I just don't have money to do that right now.
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Saturday, June 18th, 2022 AT 5:02 AM
Tiny
RODNEY7867
  • MEMBER
  • 70 POSTS
Is there a way to test the A/C without the gauges?
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Monday, June 20th, 2022 AT 6:31 AM
Tiny
JIS001
  • MECHANIC
  • 3,411 POSTS
Check out this link:

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak
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Monday, June 20th, 2022 AT 12:40 PM
Tiny
RODNEY7867
  • MEMBER
  • 70 POSTS
Okay, everything is good according to article, but the A/C light is blinking. How do I retrieve this A/C code on a non-digital control panel?
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+1
Monday, June 20th, 2022 AT 1:28 PM

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