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What would cause the ac-heater with the climate control on auto in a 1991 buick park avenue to switch to econ by itself?
Wiki User
∙ 15y ago
possibly when the a/c is not needed to cool the air temperature you set. The A/C control module has failed, as revealed on a diagnostics check.
Wiki User
∙ 15y ago
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Your 1990 190E Mercedes Benz makes a loud noise when you turn on the ACHeater fan switch Could it be the blower motor However the fan is workingjust loud?
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