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This may be a result of a failed bi-metallic switch in the a/c system. It is found in the intake port of the evaporator, located in the footwell on the passenger side, up in the front bulkhead or "firewall". This controls the blower switch (low, medium, hi speeds). It is also called the blower resistor. I'm not expert for sure, but I seen this fail on several cars in the past. It is a real head-scratcher, and was diagnosed for me in the dealership.
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