HVAC fan speed drops when making phone calls...

[Busa Dave]

LOL it is a feature and can be turned off.... Other makes have this feature as well. Kind of nice except when it is 110 and you are sitting idling talking on the phone!

 

[Tremor beast13]

It's normal, it's meant to cut back on back ground noise.

My AC fan motor doesn't seem to be very powerful, is that normal

 

[Lunch Box]

When using phone, or anytime?

 

[Tremor beast13]

My problem is all the time, I'm new to the f250, not sure if this is normal

 

[Bricaud]

My AC fan motor doesn't seem to be very powerful, is that normal

I've wondered the same thing. The system overall just doesn't seem to have much air volume from the fan to blow hard through all of the vent registers.

 

[Tremor beast13]

I've wondered the same thing. The system overall just doesn't seem to have much air volume from the fan to blow hard through all of the vent registers.

So I did find the problem with my air flow , it was my fault, I put in a hepa filter as a replacement, I learned not to do that again, ford factory replacement installed, problem gone

 

[DTX2023Tremor]

Not sure this is an issue, but it was a little weird. I assume it has something to do with power draw, but I also thought with all the batteries and heavy duty alternator it would be a non-issue.

It was 36 degrees outside.
Truck was running in park and the engine temp was normal range.
HVAC was on max fan speed (7) and "HI" temp (no defrost options going).
Heated front seats were "on" hi.

When I went to make a phone call with my iPhone (manually) while connected to CARPLAY the fan speed for the HVAC dropped to what seemed like a 5-6.

I thought it was a coincidence so I tried again and again - same. As soon as I terminated the call the fan speed went back up. There was no visual notification of the fan speed change, I only was able to tell by sound.

Are my batteries going?

It's as @ccw Said that the fan speed drops to avoid noise so call quality isn't impacted.

 

[Lunch Box]

It's as @ccw Said that the fan speed drops to avoid noise so call quality isn't impacted.

 

[jade97]

My former 2011 Explorer XLT with Sync 2 had this feature....it's been around for a while.

 

[ccw]

View attachment 135220

Looks like that’s from instructions for Sync 3. Wonder if that will work with Sync 4 or not.

 

[500mag]

FFS, just reach down and turn it back up!