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problem solved 900

posted by  someone claiming to be RobertD on  Sun Jan 25 19:00 CST 2015 [RELATED]

Hello everyone,

I have found it! The blend door was shut and the motor pointed out by Amarin did not work, but it was not in fault itself. The problem was the connection at the blower resistor. As you can see on the diagram in green book HVAC control unit 4/40 A operates blend door motor 6/27, but it is grounded trough resistor. The blower motor is grounded independently. In my case the blower was running like it should but the HVAC unit did not receive ground therefore blend door motor was not responding to cold/heat knob.






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