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Greg, Import tech
Category: Lexus
Satisfied Customers: 7129
Experience:  17 year shop owner
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Ac light blinking, It keeps blinking after accessories belt

Customer Question

Ac light blinking
JA: Just to clarify, can you tell me which light it is? And does it blink first, then stay on steady?
Customer: It keeps blinking after accessories belt replaced
JA: What is the model/year of your Lexus?
Customer: 2007 Es330
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Resetting the battery The ac was working prior to replacing the belt
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 1 year ago.
Category: Lexus
Expert:  Greg replied 1 year ago.

Hi, I'm Greg (Indy-Tech).
Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
Rgds Greg.

Expert:  Greg replied 1 year ago.

Okay with the light flashing this is telling us that there is a malfunction code stored .

What you have to do is get the stored codes .

Here is what you have to do to get stored codes .

attached is a diagram showing you which buttons to press .

With the buttons AUTO and R/F pressed switch on the ignition .

will flash for 4 seconds then start codes .

will indicate a code like 17 , 21 etc.

Get me the codes so i can help you diagnose this problem if needed.

Check the connection on the compressor and pressure switch you may have knocked off the wiring when replacing the belt ?

Rgds Greg

Customer: replied 1 year ago.
I get code 21 and 24, but when I shine a light on the solar sensor, the codes shows 00. I have tried to switch the ac clutch MG relay with another working one from my other car and still it blinks and wont engage the clutch
Expert:  Greg replied 1 year ago.

This should not cause the compressor not to work .

Disconnect the battery for ten minutes and then retry.


Customer: replied 1 year ago.
Would a loose electrical connection cause a code? I did unplugged a few clips to remove the belt tensioner
Expert:  Greg replied 1 year ago.

Hi .

Yes if any sensor is disconnected when the battery is still connected then this will set a code .

To clear codes disconnect the battery for 10 minutes reconnect and check for codes .