Rear AC is colder than the front... Any ideas????

[lowreese26]

Been beating myself up trying to figure out why?
Any help would be appreciated.
I am probably gonna clean the blower box, dryer and condenser this weekend.
This is in my 99 Yukon 4x4 5.7 by the way

 

[Scrufdog]

My 95 was the same. Figured out that the dash vents arent flowing very well for some reason, so I set the air selector valve to half underdash. helf dash and the Burb cools much quicker now. I'm about to do what I recommend you do, clean out the condensor, evaporaor if you can reach it, blower box, etc. Im thinking on both of ours there my be a restriction. On mine, I think the actuator motor that selects between dash and underdash is bad or jamming up.

 

[BoxerPitMix]

The same way on my '99. Everything is clean, I think that it's just going to be that way since there are only a couple little vents coming from that condenser in the rear.

 

[lowreese26]

The thing just isn't blowing as hard as my truck does.
Wonder if it could be the blend door actuator.

 

[Scrufdog]

I just messed with mine. The underdash vents in the center, are molded into one piece, held in by one screw. I took off the screw and could see the vent mode door using a mirror. Mine is actually working as it should, it just leaks air past the door. The rubber seal around the door is worn out some. So what I did what hold my hand in front of the dash vents and one click at a time, watched the mode door to see when it would actually start opening. On mine it opens after 3 clicks towards the upper and lower mix. When mode door selector is one click under halfway, I get the same amount of air out of the dash vents, but also get a lot of air out of the bottom vents. I'm leaving it there for now, and I left the little vent box thing off the bottom too, seems to flow much more air without it.