Question about 1993 Buick Roadmaster
1993 Buick Roadmaster with automatic HVAC system. System works fine with engine idling and car not moving. When the car begins moving in normal traffic the HVAC controls become inoperative, disabling the compressor, and will not accept manual input at the control unit on the dash. When the car is stopped,.such as at a traffic light, the HVAC controls again function normally, accepting manual inputs and permitting the compressor to operate. As soon as the car begins to move forward the HVAC disengages the compressor and refuses to accept manual inputs. All sensors are functioning per specifications. Help! This one has stumped everyone.
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Posted on Jan 02, 2017
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Diagnostic System Check - HVAC Systems - Manual in HVAC Systems-Manual for 2.2 L with DTCs
Diagnostic System Check - HVAC Systems - Automatic in HVAC Systems-Automatic for 4.3 L with DTCs
The Diagnostic System Check will provide the identification of the control module(s) which command the system.
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
Review the Description and Operation information to help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation.
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