Blend Door Actuator?

Thanks.

Only my defrosters and the floor vents push air. How do I know which actuator is the issue and are all the actuators the same?

I need the location of the temperature blend door actuator on passenger side dual zone climate (electric). All cold in vents floor defrost. Vent on dash and rear when heat on 90 on passerger side. Drivers side is all hot like it should be. Please help it is winter. Thanks, Rick

I know where actuator is, but how do I get it out with the frame bar blocking it?
Really need to turn it to heat with winter approaching.

2004 trailblazer. Passenger side actuator not easily accessible with the frame bar in the way. Need to get heat going. Only blows cold air.

I've determined that the re-circulation actuator is faulty as with the glove box and lower dash cover panels removed you can look through and watch the "door" slowly fall open then the actuator struggle to close it once more before it gives way again. I will be ordering/replacing that actuator soon. My pickle here is; I got little to no flow out of my driver's side floor vents and the rear seat vents. It's an LS model with just the simple mode selector switch for the rear. When I set it to floor I have excellent flow on the front passenger floor only, vent comes out all front vents just fine but nothing comes out of rear vents or floor aside from a very weak flow. Also have air lightly leaking from front defrost. Should I replace another actuator in conjunction with the re-circulation one? Would the mode/blend actuator or defrost actuator cause the lack of airflow to driver's floor and rear of vehicle?

Manual system.

Wow, this is an incredible site! Thank you so much for your very timely response and recommendation. It was my suspicion but didn't know if maybe the defrost and/or driver's temperature actuator was playing a factor. I'll check it all out once I'm in there to replace them. May just have junk in it but those actuators seem to have quite the reputation, haha. Hey, aside from that, do you happen to know what size filter I need to put a cabin air filter in? I've read they didn't come equipped with them until later in the production but there's a place to install them. I pulled that cover today and there were pine needles galore, so I'd like a little more at work there other than that plastic mesh. Can't look up a filter for it on auto parts stores, that I've found anyway. Heard you can use the one for a 2000 Silverado or something like that, is it possible? Or is there a filter that's actually made for it and I'm just too dumb to find it? Haha
Thanks again.