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Blend Door Reset/Calibration Procedures?

10764 Views 2 Replies 3 Participants Last post by  epm131
Does anyone know the AC/Heater blend door calibration procedures? I have a 2007 FJ. I was able to replace all of the actuators, but the air mix actuator is moving too far in either direction.

Thank you in advance.
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I don't see any calibration procedures for the A-C/heater unit. Are you sure you don't have a broken blend door?
How do you know that the air mix servo is moving to far in either direction? Does it make noise, hit something? Do you get cold air when selecting hot?

If it moves too far, it's most likely due to the linkage as the stops are built into the linkage. The only other possibility is a bad servo, or your ecu is messed up and sending voltage for too long (though highly unlikely)

As far as I know, there is no reset calibration procedure for any of the ac/heater servos. They're controlled by the ecu and either operate smoothly, as intended, when voltage is applied, or you have to replace it. They're not serviceable.

attached pic is the test procedure for the air mix servo:


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