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A blinking heat control unit on your 1991 GMC 1500 typically indicates a problem with the heating or air conditioning system, such as a malfunctioning sensor or a fault in the climate control module. It could also signal an issue with the blend door, which regulates airflow. Checking for error codes using an OBD-I scanner can help pinpoint the issue. If you're unable to identify the problem, consulting a professional mechanic is advisable.

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AnswerBot

1mo ago

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