Where is the A/C flow switch clutch switch located?

2011 TOYOTA SIENNA

150,000 MILES • 3.5L • V6 • 2WD • AUTOMATIC

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I recently had A/C serviced. Right after picking it up it was not blowing out cold air took it back to mechanic. We looked under the hood and before we were able to open anything as the A/C clutch activated in cold air began to flow. Mechanic thought maybe A/C flow switch clutch switch was going out. So I was attempting to replace it myself I can’t find out exactly where that relay switch is.

May 14, 2021 at 6:16 AM

KASEKENNY

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I am not sure I know exactly which switch you are referring too. I assume you mean the relay that the AC amp closes in order to send power to the compressor? If this is the case then that is not a traditional relay. It is an integrated relay in the junction block in the engine bay.

So what I would do is check for power on the blue wire at the compressor when the A/C is on and make sure there is power when the compressor is not engaging.

If there is no power on this wire then that integrated relay would be the issue.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Below is the wiring diagram that will help with this. Also, a list of the other sensors that you may be referring to if it was not this relay.

However, before you replace this junction box we do need to confirm the pressure sensor or some other sensor is not causing the ECM to cut the compressor off.

Let's start with this and go from there. Thanks

Images (Click to enlarge)

May 15, 2021 at 8:14 AM