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c crystal pryor Posted on May 19, 2016 Answered by a Fixya Expert

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View Our Top Experts I have codes b0428 and B3532 coming up . I just need to know what the problem may possibly be and what might I do to fix it ?

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Jeff Armer

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• Chevrolet Master 15,575 Answers
• Posted on May 19, 2016

Jeff Armer Chevrolet Master Level 3:

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Joined: Nov 22, 2012 Answers 15575 Questions 1 Helped 7303233 Points 73901 Follow View Profile Re: I have codes b0428 and B3532 coming up . I just need...

B0428 Temperature Control 3 Circuit - HVAC Control Module B3532 Air Flow Control 10 Circuit Performance HVAC Control Module DTC B0238, B0239, B0248, B0249, B0251, B0268, B0269, B0408, B0409, B0414, B0418, B0419, B0424, B0428, B0429, B0434, B3531, B3532, B3747, B3749, or B3782 The HVAC control module controls the HVAC actuators to regulate the airflow and temperature through the HVAC system. The actuators are 2-wire, bi-directional electric motors that share the same common control circuit. When the operator adjusts the actuators, the control module can only operate one actuator at a time due to the shared common control circuit. The control circuits use either a 0 or 12-volt value to coordinate the actuator movement. The HVAC control module reverses the polarity of the control circuits to move the actuator in the opposite direction. The HVAC control module determines the door position by counting motor pulses on one of the control circuits. The HVAC control module converts the pulses to counts with a range of 0-255 counts. When a calibration or recalibration procedure is performed, the HVAC control module calculates the door travel range. The HVAC control module compares the total number of pulses to calibrated limits. If the total pulse count is less than or equal to the maximum calibrated limited and more than or equal to the minimum calibrated limit, then the calibration is considered successful. This is something best left to a qualified repair shop . If a HVAC actuator needs replacing the instrument panel may need to be taken a part . Diagnostic Aids ?€¢ Inspect the appropriate actuator door and actuator for the following conditions:

- A misaligned actuator--Refer to the following procedures:

?€¢ Mode Actuator Replacement

?€¢ Defroster Valve Actuator Replacement

?€¢ Recirculation Actuator Replacement

?€¢ Temperature Valve Actuator Replacement - Right Side

?€¢ Temperature Valve Actuator Replacement - Left Side

?€¢ Auxiliary Temperature Valve Actuator Replacement

?€¢ Auxiliary Mode Valve Actuator Replacement

- Broken or binding linkages or actuator door

- Obstruction that prevents the actuator door from operating within its full range of motion

- Missing seals to the actuator door

- Misaligned seals to the actuator door

?€¢ Refer to Testing for Intermittent Conditions and Poor Connections .

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• Expert 74 Answers
• Posted on May 19, 2016

Charles Norris Expert Level 2:

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Joined: May 14, 2016 Answers 74 Questions 1 Helped 22751 Points 195 Follow View Profile Re: I have codes b0428 and B3532 coming up . I just need...

Code B0428 is for the rear temp actuator. Code B3532 is for the rear mode actuator for the HVAC unit

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