The usual problem is the vent solenoid.The only thing is the best way to check it is with a scan tool.The vent solenoid is located in the rear area just in front of the rear axle.By the canister.There will be a line going from the canister to the fuel tank.Replacing will not make the light go out right of way but if this is the problem it will go out once the PCM performs a couple of run cycles and passes the test.Other wise the only way to clear the code is a scan tool.As far as the blower motor.If it does not work at all.You need to go on the passengers side and If there is and insulator panel then remove it so you can see the blower motor.Take a screw driver and tap on the motor with the handle part of the screw driver.If it starts to run then replace it.It might keep working for a while but it will eventually go out again.If it works on some speeds then you might have a bad blower resistor module.Hope this helps.Good luck.
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There is no access panel on the passenger side of the Hummer to access the blower. The Hummer is still under warranty and is going in for service on2/27/12.
The vehicle only has 28,000 miles. We are concerned about these issues!!
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