Defrost vent.
 

The vent cover in the middle of dash (defrost) has somehow broke apart. I have searched the forum for leads on where to find this part and have also looked at my local junkyards. Is there a reliable online source for interior parts? 01 blazer. Beige trim

I found a replacement on eBay,but it does not have the hole for the a/c sensor. Drill?

check LMC truck.

Lmc truck didn't have it, but thanks for turning me on to their website. Lots of Blazer parts. Already ordered a catalog.
S10 warehouse has it, the hole in the middle for some sensor is not there.

I got mine off of eBay also. Fast shipping and perfect color match. I never knew of an a/c sensor on that piece.

What is a A/C sensor?

uhh.

as far as i know,at least on the older blazers its a vacuum line and a diaphragm that opens the vent. thats it.

How picky are you? Cause if your like me, (I have the charcoal interior so it matches) use JB Weld. holds together excellently. Cheap and effective for a part that is not directly in your line of sight.

The hole is for the temp sensor for blazers/jimmys
That have the auto climate control option

i just bought my truck one off of ebay

make sure its an OEM, i ordered a aftermarket and the color didnt match and i ended up returning it

i too have beige and the OEM one that came in yesterday looks perfect

1998 2004 Chevrolet S10 Blazer GMC Sonoma Beige Defrost Vent Grill Cover | eBay

thats the exact one i bought, and it took 3 days to come it...great seller