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Having problems with climate control. Temp setting does not come back on to the last setting it always comes back on at 75. Also when pushing the front defrost it doesn't blow air.

This is a 2005 Cadillac STS

1 Answer

Jeff Armer

Cadillac Master 15,575 Answers
Posted on Jan 10, 2017

Jeff Armer

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Joined: Nov 22, 2012

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You may want to have it check for DTC'S diagnostic trouble codes . A code may point to the problem , these HVAC systems are very complex .
DTC B0248, B0268, B0408, B0418, B0428, or B3531
The HVAC door actuator is an electronic motor with a feedback potentiometer. The HVAC control module supplies power and ground to the actuator. The HVAC control module controls the direction of the actuator by changing the polarity of the control circuit. When the actuator reaches the desired position, voltage is removed from the control circuit. The HVAC control module determines the current position of the actuator by monitoring the feedback voltage of the door position signal circuit. The feedback potentiometer position is a function of the actuator position.
• Air flow control 3 circuit refers to the front mode actuator
• Air flow control 7 circuit refers to the recirc actuator.
• Temperature control 1 circuit refers to the driver air temperature actuator
• Temperature control 2 circuit refers to the passenger air temperature actuator
• Temperature control 3 circuit refers to the rear air temperature actuator
• Air flow control 10 circuit refers to the rear mode actuator
DTC Descriptors
This diagnostic procedure supports the following DTCs:
• DTC B0248 Air Flow Control 3 Circuit
• DTC B0268 Air Flow Control 7 Circuit
• DTC B0408 Temperature Control 1 Circuit
• DTC B0418 Temperature Control 2 Circuit
• DTC B0428 Temperature Control 3 Circuit
• DTC B3531 Air Flow Control 10 Circuit

Your having air flow issues and temp. control !
DTC B0413, B0423, B0433, B3761, B3773, or B3782
This diagnostic procedure supports the following DTCs:
• DTC B0413 Temperature Control 1 Feedback Circuit
• DTC B0423 Temperature Control 2 Feedback Circuit
• DTC B0433 Temperature Control 3 Feedback Circuit
• DTC B3761 Air Flow Control 3 Feedback Circuit
• DTC B3773 Air Flow Control 7 Feedback Circuit
• DTC B3782 Air Flow Control 10 Feedback Circuit

Do you know what a scan tool is ?
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, command the appropriate actuator in both directions.
Does the actual parameter of the appropriate actuator change?

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2002 Park Avenue The 2 year old AC compressor will not kick on. FULL of freon, Temp controls work fine and the pressure switch was replaced. I tested the clutch and it works as well.

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Having problems with climate control. Temp setting does not come back on to the last setting it always comes back on at 75. Also when pushing the front defrost it doesn't blow air.

1 Answer

Jeff Armer

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Trustworthy Expert Solutions

Having problems with climate control. Temp setting does not come back on to the last setting it always comes back on at 75. Also when pushing the front defrost it doesn't blow air.

1 Answer

Jeff Armer

Add Your Answer

Attachments: Added items

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