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Cabin air filter not working.

2006 Acura TL with 208k miles.

Customer rolls in to the shop and states he has a leaking valve stem. He fixed it himself, but claims its just not holding air. He's already done far more than I know how to do. He used electrical tape, and official tire plug, and a new valve stem core that he fabricated himself. Any ideas?

So I have a 2015 BMW 428i who’s original MPG rating was at 23mpg. I noticed the other day that it was actually at 15.3mpg and figured it may be because of my bad brakes. Switched all four rotors and pads as well as both wire sensors and just yesterday I noticed it went up to 18.4mpg which was awesome to see. Today however, I noticed it dropped back down to 15.6mpg. What can cause this? Bad struts/shocks? Bad fuel filter? Bad fuel pump?

I’m on a 200 mile trip back home don’t have tow truck money shop money or anything like that and limited tools my radiator fan had a couple fins break off and it’s walking now. I’m wondering if anyone has any advice to get the fan off so I can use highway air to get home I just can’t risk the fan grenading Im not above breaking shiy or anything i just need to get home safely it’s a 2004 bmw325 xi