Very little heat & Exterior temp sensor questions

[Wilson01S]

Hey guys I have a two part question that I have searched extensively, and found a few results that are seeming to confuse me.

First my 01 S has very little heat coming from the vents when the heater is set to High. I have noticed lots of foam particles starting to make their way out of the vents. My guess is that I have something blocking the blend door in the heater core box. Is the only way to repair to remove the heater box from under the windshield cowl? Is there any access from inside the car?

Also on an unrelated note I noticed my car has a temperature sensor in the front grill which I would assume is for an exterior temp display (which I do not have).
I read that some cars need to have this activated, or add a stalk for the OBC?? Seems this was for 97-00 cars. Whats an 01 have to do to get some love for the outside temp?

Thanks!