txfromwi
Full Access Member
Purchased used about 50K miles in 2019.
Have used it very little due to Covid.
Under these exact conditions, and ONLY these conditions, and very reproducible once you figure it out.
Over about 85F ambient temperature
Blower set at about half speed.
(Also happens on blower on auto, but not as reproducible)
A/C must be ON
Hold the same RPM for at least 60-90 seconds. Stoplight or freeway at stable cruise.
Increase RPM/speed, is as in pulling away from the stoplight or acceleration from cruise
Get a high pitched, reasonably loud whistle for about 5 seconds or so.
It's not outside air over a cowling, it is absolutely an AC related noise.
We can live with the noise, more concerned that there might be something wrong.
Thanks.
Have used it very little due to Covid.
Under these exact conditions, and ONLY these conditions, and very reproducible once you figure it out.
Over about 85F ambient temperature
Blower set at about half speed.
(Also happens on blower on auto, but not as reproducible)
A/C must be ON
Hold the same RPM for at least 60-90 seconds. Stoplight or freeway at stable cruise.
Increase RPM/speed, is as in pulling away from the stoplight or acceleration from cruise
Get a high pitched, reasonably loud whistle for about 5 seconds or so.
It's not outside air over a cowling, it is absolutely an AC related noise.
We can live with the noise, more concerned that there might be something wrong.
Thanks.