[HUMMERcustoms.com/TAZ]

My A/C felt week also and I had dealer look at it several times and they said eveything looks good. With learning that I went back to my thoughts of A/C can only lower the temp on average 20 degress from the ambient temp.
But I felt something was wrong.
Before I put the supercharger on I had already before for about a month had an electric fan that fits a 2005 chevy HD truck.
To My amasement the A/C would freeze You out of the rig. I asked the service manager what was gogin on. I had thought I had enough air flow already. He said well this had been a fix to Escalade's for poor air flow that hurt the A/C. He said that it was not a problem that occured very often.
Well it solved My problem so it may be the way to solve Yours. You can get the fan at eadperformance.com.
Then go to nelsonperformance and get the wiring harness that Allen has made for this fan to connect it to the H2. He gives instruction on how to connect it. You will need someone with aftermarket tuning software to turn the fan control in Your PCM and tell it what temp it turns on and off.
INstall is not very difficult if Your fairly handy. the bolts on thf an do not match the H2 so You drill new hole in fan that match. Put a rubber washer between metal and fan and then rubber washer between fan and bolt head to preven the fan shroud from craking . So far I have not heard a complaint on this setup and I love it. You will need to cut tranny cooling lines and take a section out to let the bottom corner of fan to fit into the spot where it locks in at. Just put rubber hose in the cut out section and clamp them down real good. I think like My problem it should solve Yours. I think that Hummer just does not want to recognize this problem with poor air flow through all the H2's. It does seem that it is a problem for some but, not for all. I got no answer from dealer why this is.
Hope this helps
TAZ