Hummer H2 - Recent Questions, Troubleshooting & Support

2003 hummer If you have trouble in fixing your vehicles, try this link. Very helpful

They are not vac on the h2. there is 2 for temp control, one for recirc and one for blend. check the hummer forum as there is a great read for it there. the driver side actuator is really ez as it's under the glovebox, 20 min fix. the rest take removing the whole dash but it's not that tough.

How do I turn on my fog lights on my 2005 H2 Hummer

well first go to GM and ask for RPO look up from VIN learn the engines (day1new) RPO code! first. the dealer can use the engine serial number too. the service manual shows how to find, all VINs engine and tranny seriels. in chapter 1. Gm makes this all so easy so do it. ask them,.

show photo of it. how can anyone guess.

GOOGLE HOW TO BLEED BRAKES YOUTUBE. THERE ARE MANY WAYS LIKE FACTORY PRESSURE BLEED WAY!!!!! GRAVITY BLEED, VACUUM BLEED. or there 100 year way, 2man foot and zerk like fitting open close way. at each caliper. Pump up foot,valve open, bleeds, close valve , foot up. repeat tell your eyes glaze over.bored. Some cars you need ABS tool to go to bleed mode.

no VIN or enigine told. 2002-2003 Vortec 6000 5,967 cc (6.0 L; 364.1 cu in) LQ4 V8 YES, AND SMACK ATOP THE INTAKE MANIFOLD. SEEN HERE (PIC2) https://ls1tech.com/forums/generation-iii-external-engine/1810846-what-these-ports-my-lq4-intake.html read SM https://eautorepair.net/Marketing/Default.asp

cranks fast every time , starter motor cranks the engine fast , not slow, or dead starteror cranks fast, starts and stalls in 2 secondsand fast right foot actions can not prevent the stall?yes ,yes,, look at dash IP cluster see IMMO lampif IMMO lamp fails (security) then try the 2nd key Chevy gave you day 1 new. both keys fail>? oopsteeh guide is H2 ,free from Chevysecurity key called PASS_LOCK(tm)page 2-19 in the manualread it. https://experience.gm.com/bypass/pcf/gma-content-api/resources/sites/GMA/content/staging/MANUALS/0/MA358/en_US/2.0/2k03hummer.pdfDuring normal operation, the security light will turn offapproximately five seconds after the key is turned to RUN.beyond all that there are 50 things to make engine not run, GOT TOOLS> (lots of em)? Ill not guess all 50 and post them but can.

If the 4WD service light comes on when you start your Hummer H2, it could indicate a problem with the four-wheel drive system. This warning light could indicate a problem with the transfer case, the drive shaft, the front or rear differential, or other components of the 4WD system. It is recommended to take your vehicle to a certified mechanic or a Hummer dealership for proper diagnosis and repair. The service light coming on could be a sign of a serious problem, and it is important to address it promptly to avoid further damage to your vehicle and ensure safe operation.

There is one of two way to remove them. With the roof fully open check inside the runners for mounting screws or bolts. If there are none visible it is probably mounted from inside the vehicle. If they are inside mounts you will need the glass in the closed position and with a helper it will be easier to lift out. If there is a roof liner fitted you will most likely need to remove it to gain access to the mounting bolts. Not all sunroofs can have new rails fitted so you might have to replace the whole thing.

Blend Door Actuator Servos not working or Blend Doors off their mountings.

never worked on a hummer but rule of the day is that there always is a drain on the firewall on the engine side. usually a small rubber hose about two inches long direced downward. Usually you can stick your finger in there and clear it out. Don't shove anything hard into it or you can punch a hole in the evaporator core.

You replaced the fuel gauge stepper motor two times ? Did you do it correctly ? Fuel Gage The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gage defaults to empty if: • The PCM detects a malfunction in the fuel level sensor circuit. • The IPC detects a loss of class 2 communications with the PCM. When the fuel level is less than a pre-determined value, the low fuel indicator illuminates. Reviewing the fuel system description will further explain how the system functions. Refer to Fuel System Description . Did you try replacing the fuel level sensor ? Check for DTC'S diagnostic trouble codes ?

i know you said you have flushed through the sunroof drain channels , have you actually cleared all four out let tubes , one ine each corner of sunroof tray ,there are rubber tubes from these outlets tath emerge at the wheel arches behind inner arch covers its ussually the back ones that get forgotten ,a good tool to use is a flexible domestic pipe cleanring rod ,used by plumbers for sink blockages etc let me know if this was of any help cheers

first check to see if anything is blocking the tracks if so remove. next it could be the switch if passenger side has controls try swapping them if passenger side does not have controls take switch off and check the resistance in the switch when in the on position (forward or back) if it is not the switch motor is probably burned out if passenger side again has motor try swapping. (passengers don't need to be comfortable) or just buy a new motor. hope this helps

when you shut it off were the wheels cranked sideways-sometimes this puts pressure on the locking system and won't let it disengage-try moving the steering wheel back and forth while applying pressure to the key-I hope this helps-cheers Denny

There are some possibilities that you will have to get checked. Possible causes.....
1. HVAC Control Module needs recalibration.
2. Control Head needs replacing.
3. Refrigerant System leak. 4) The blower door actuator. the blower door actuator. The HVAC system under the passengers dash, to access it remove the cover below the glove compartment, 2 screws. The drivers blower door actuator motor is closest to the transmission tunnel and is held in place with 2 screws. The Passenger blower door actuator is directly above it on the TOP of the housing. Remove the glove compartment and you can get to it on the top of the HVAC system. Reach up and unplug it and plug it back in first. if it does not correct it you will need to replace it. It is not an easy job since most of the dash must be removed. Start by removing all the decorative allen bolts accross the dash. The center section can be pulled forward an inch or so. This will allow you to remove the trim around the speedometer cluster and drivers a/c vent. The passengers side is a little tricky. You need to remove the side panel that rests up against the door panel. Shine a light in at the upper left corner and you will see a white button aprox 1/8" wide and 1/2" tall this needs to be pushed in with a flat blad screwdriver while gently pulling out on the passenger grab bar(above the airbag). The second white button can be reached throught the far left glove compartment opening. I reached up and pushed in on the white button on this side while pulling out on the handle. This will allow the handle to be removed and the trim peices following. You can now see the screws that hold the upper dash cover there are aprox 3 screws on the driver and passenger side. You also have 2 in the center behind the center trim piece pull forward an inch or so and a 1/4" drive socket will get to the screws here. It then just pulls straight forward NOT UP. and don't forget to unplug the sun sensor on the dash.
Remove the clip holding the duct work you will now see is connected to the backside of the dash passengers side. You can secure it from the outside when reassembling. The acctuator can be seen and replaced. It is still tight but I did not have to take it to the dealer. You have 3 actuators on the H2 that is Drivers side, Passenges side, and recirculate. I would suggest whil you are under the dash remove the blower motor (3 screws and clean out the fan shoot some compressed air in to get any other dust out.). if in your ac system you are using dual control system then, The heater control valve has failed and is open allowing the passenger side heater core to stay hot. It is a very common problem and expensive to repair. It tends to be an intermittent problem and sometimes will work properly. The heater control valve needs to be checked. Dual Climate Control Valve (DCCV) is failed.
If the heater valve is checked ok then the other possibilities which can make this problem occur are.
the blend door and the blend door actuator.Either the blend door is got craked or getting blocked or the actuator is got broken.
Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

ther is a inersua switch some were on that hummer plus check with the dealer that H2 has som kind of fuel sending unit problem if you park it on a steep hill and with low fuel it will triger it and it will crank but wont start but will have gas the delear reset my blank..... button I for gt wht but chek first or you may have burened out the fuel pump been there too.....the pump is in the gas tank I think this is your problem put car in park break on then have some one turn the key on the fuel pum shuld hum for about 3 seconds then shut off....part cost about 190.00 dont get tricked into paying 700.00 for a factory pump

no info generic answer no by-pass have vehicle scanned for trouble code ----how did you evaluate that problem is security ---failing ignition switch -fuel filter/pump -- failing sensor loose or damaged wire and about 50 more reasons check and test first 3 to narrow down to electrical or fuel problem

Your airbags probably have an air leak or are just starting to crack. Go to you tube and type in Suncore hummer suspension air bag replacement. They have a whole how to install that also show your suspension and how it fails