SOURCE: 2006 H3 Hummer AC/Heater Fan Motor
I brought my 2006 H3 in to the dealer for the same thing. My blower stopped working all together but it started as an intermittent problem. He said he had to replaced a diode or resistor either behind the switch on the dash that controls the fan or on the fan motor itself. Have not had a problem since but that was only about 4 months ago.
SOURCE: my 2003 h2 hummer will initally not shift from
Check the linkage that goes from the shift lever down to the transmission. It sounds like somewhere along the line, it has become disconnected or has broken.
if that parts are clean then It sounds like you have a shift control solenoid that has high resistance causing the hard shift you describe. Scan the PCM for trouble codes if none are present you could have a internal transmission problem.
SOURCE: Hummer H3 Losing power when shifting from 1st to 2nd gear.
as odd as this may sound, try replacing the fuel filter.
SOURCE: HUMMER H1 1996 NOT SHIFTING OUT OF 1ST GEAR
youre going to need to take it to either a hummer dealer or a reputable and trusted transmission shop. these are general motors transmissions and do not cost a lot to rebuild. the only difference in price is whether on this year you have the 350cid gas or 6.5 na motor. wish i had better news but remember that transmission is constantly trying to move 8500lbs. service every 15- 20,000 miles. let me know if further assistance is necessary. i am certified with am general.
SOURCE: where is the MAP sensor on a 2006 Hummer H3
Its located on the drivers side of the engine,mounted on the side of the upper intake plenum.
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