It they cannot find problem ask them to put on a Chevy truck 2500 series dual electric fans. Changed the complete performance on My AC.
While researching it I found that this fix became standard on Escalades when continued AC perf. was poor. Cadilac did it for free but, doubt Hummer will.
I made My upgrade for Performance reasons and then find out the AC would freeze Me out. I had been considering a rear AC setup but, no more.
If You have an other problem then stay on them.
But if You would like just better cooling just search dual air fans in the find under TAZ.
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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