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Here is a link to the step by step instructions for the fix. Easy to do. I had the same problem with my 06 H3 and fixed it myself and saved some serious $$$
http://www.hummerforums.com/forum/hummer-h3-17/ac-blower-fix-19208/
The alternator is probably the reason you had to boost it. It probably died and running the engine ran the battery down. These can be checked at the parts store before you purchase another one.
K and N site part nos ...h3 k33hp2006..........h2k33hp1007,look on the site depends on engine,but good info,Kand N seems good enough,especially with High Perfrmance bikes, MX etc
I am a Service Advisor for a Hummer Dealer. I can tell you that we have seen some of the 06 h3's with the same problem you are having. The blower motor resistor and harness will probably need to be replaced. The connectors on these have a tendency to melt. If you are still in factory warranty, it will be covered under your warranty, otherwise at the dealer the repair runs around $650.00 parts and labor. Hope this helps.
This may be normal, depending on the thermostat installed. They make optional thermostats of various temps. You can probably get a 190 degree thermostat. It will probably not have a significant effect on the engine operation, but may give you some peace of mind.
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