|
Also check for a mouse nest in the fan impeller. If you get trash in the impeller blades, you can often hear it thrashing when the fan is running on low speed or when starting or stopping.
The wind deflector over the wipers on my car doesn't block the vent inlets under the windshield wipers, it just a short extension of the hood that diverts the airflow over the wipers. The main effect of the air deflector is to reduce the high pressure zone found at the base of most car's windshields, so at highway speeds, the vent airflow with the fan off (ram air flow) is much diminished. So I have to run the fan on low where before I used to get a modest level of airflow with the fan off. The vent airflow with the fan on high speed is unchanged.
|