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Q: the blower for the AC/heater does not work. no air blows out on 1998 Volvo S90

could it be the servro motor, what are the costs
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The vacuum servo motors are a very common issue with this model. When they start to leak, you will hear the blower fan working, but the airflow will stop coming out of the center vents when you accelerate the car. If you don't hear the fan, then yo have an issue with the fan motor circuit.
Can you describe if the fan motor is running or not? Is there any airflow from the vents?
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