[profarm72]

Dude, You rock. Thank you for posting this fix on here, I have been dealing with this for the last couple of years however this year has been the worse.

The only way I could get any air through my vents were to run it on Panel-floor.

This morning I pulled the unit out and began to pull it apart just as your instructions say to do so. I come across the small o-ring but was thinking for some reason or other you were talking about another one down inside the hole. Turns out I was trying to make an easy job into a harder one. It didn't however take me long to figure out that those were the ones that you were talking about. I pulled off three of them that actually broke off in my hands.

I hooked it all up before re-installing anything to be sure that everything was going to work correctly, started my truck, hit the Max button and what do you know, Cold A/C coming from the vents just as it should.

Thanks again for posting this fix and for you guys about to tackle this job, just follow the directions, its that simple.