Unknown airflow

[Wine Hill]

1998 k1500, unknown airflow as I drive truck. Blows on my legs, and as I steer right the flow changes towards my right. And same as I turn left, air directs towards left. Not from vents but from below dash. Just happening on driver's side. Any help

 

[Wine Hill]

Adding to my post. The temperature of the air is same as the outside temp. All vents are turned off. And this is only happening on driver's side, never saw this happen

 

[east302]

Check where the steering shaft goes through the firewall. There’s a rubber boot there that can sometimes come loose.

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[Wine Hill]

I will check it out, thanks

 

[Wine Hill]

That's exactly what it was, boot slipped through firewall, put back in place and will test it tomorrow, thanks east302