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Hummer engine repair questions and answers

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56 Questions
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  • joey
    joey - 2007 Hummer H3 - Engine - 4/9/2015
    Car does not start intermitingly 1 out of 20-30 times
    when this happens the anti theft light on dash lites up wait ten minutes then it starts.
    0 answer
  • PHIL
    PHIL - 2008 Hummer H3 - Engine - 11/13/2014
    Why almost stalling out at 1st start up or after sitting for a couple of hours ?
    Rough Idle on start up ( for approx. 15 sec. ) before fuel sensor kicked in, then Idles smooth. Tried carbine cleaning and changing plugs still having problems !!!!
    0 answer
  • shellymac
    shellymac - 2008 Hummer H3 - Engine - 10/26/2014
    My 08 h3 thermostat and ac go off at the same time and comes back on sporadically ?
    i had the water pump changed ,the thermostat sensor changed .it was fixed for a few months and then started doing the same thing again .
    0 answer
  • sergioa57
    sergioa57 - 2004 Hummer H2 - Engine - 4/1/2014
    Display says battery not charging
    Changed battery(new one) & replaced alternator and still!
    0 answer
  • thelastindian
    thelastindian - 2006 Hummer H3 - Engine - 10/15/2013
    Stall's warm or cold, can be restarted, but must wait a min. or so to try.
    no CK engine codes
    0 answer
  • thelastindian
    thelastindian - 2006 Hummer H3 - Engine - 10/15/2013
    Stall's warm or cold, can be restarted, but must wait a min. or so to try.
    no CK engine codes
    0 answer
  • weco100
    weco100 - 2007 Hummer H3 - Engine - 9/16/2013
    Engine periodically cranks but won't start. Maybe 15 minutes later stats fine. Happens once or twice a week.
    Seems to be worse when it sits overnight.
    • spyder369king
      9/16/2013 spyder369king
      having same issue with my H3, I had a leak in my sunroof...the sunroof drains were clogged, causing my carpets to be saoked, evidentally the water ran into the electrical causing something to short out ( thats what the mechanic says anyways....) but my car starts in 11 to 13 minutes everytime....makes no sense...something else must be wrong
  • jenjen74960
    jenjen74960 - 2009 Hummer H3T - Engine - 9/11/2013
    What would cause the AC to freeze up?
    air has been blowing colder than normal even with the AC off.
    • wbrockstar
      9/11/2013 wbrockstar
      Running the ac on max ac versus runnin it on panel ac,will cause it to freeze up but only when youve got the fan speed on the 1st or 2nd level.I.E.dont push the button on max ac and then keep the fan on low,or else it freezes up.A faulty dryer can allow excess moisture to build up,causing it to freeze up.Make sure the ac condensor ( the part that resembles a radiator and mounts in front of it ) is free and clear of all debris.Remove it and clean with compressed air or light water pressure from hose pipe nozzle,if it is caked up with leaves,dirt,bugs,etc.Its job is to convert the freon which leaves the compressor in a high pressure vapor state into a warm high pressure liquid state before next bein sent to the evaporator core,in housing under your dash.If condensor is dirty and not allowing airflow to pass through it,the freon might not be converting from vapor to liquid state,causing improper system function.The clutch cycling pressure switch,mounted on dryer,controls evaporator core pressure to prevent evaporator icing and blocked air flow.I would check this first since its the easiest part to gain access to.Good luck
    • John's Auto Repair
      9/11/2013 John's Auto Repair
      Sounds like the compressor is not cycling off when the low side pressure gets below
      a certain amount. I believe your system uses a pressure cycling switch.
  • Gerry
    Gerry - 2007 Hummer H3 - Engine - 9/10/2013
    Where do I find the fuel line vent sensor on my hummer h-3
    I have a fuel line sensor vent code coming up. Chipmunks got into the air breather compartment . They built a nest in the air breather box and covered the air filter. I fixed that then a vent line sensor comes up as well. I found a small rubber wire cover or sensor ...
    • bear.1216
      9/10/2013 bear.1216
      Check the vacuum diagram under the hood and trace all the hoses that attach to the EVAP vapor canister. The sensor is either attached to vapor canister or fuel tank. Check all evaporative emmisions hoses for leaks. Also check gas cap and canister purge solenoid. What is the actual code you are getting.
    EDWINCASTILLO713 - 2006 Hummer H3 - Engine - 6/27/2013
    0 answer
  • sergioa57
    sergioa57 - 2004 Hummer H2 - Engine - 4/30/2013
    Cranks but doesn't turn over!
    Same problem once before, problem was ignition coil. Replaced one fixed problem. but now same symptoms, so checked all coils and couldn't find bad one.
    0 answer
  • bearcats3
    bearcats3 - 2007 Hummer H3 - Engine - 3/25/2013
    Where is the starter located
    0 answer
  • acres14
    acres14 - 2006 Hummer H3 - Engine - 3/23/2013
    How to replace pcv system
    • Jimm
      3/23/2013 Jimm
      The PCV (positive crankcase ventilation) system consists of; the PCV valve, the valve seal, the valve connect hose and tubing, the PCV filter. You can simply replace each or all these items, depending on the condition.
      Here are several possible on-line auto parts sources;,,
  • claudio
    claudio - 2006 Hummer H3 - Engine - 1/22/2013
    Have a Honda civic ex 04 not getting any heat blowing cold air what can I check for
    no heat just cold air
    0 answer
  • taylor
    taylor - 2006 Hummer H2 - Engine - 12/23/2012
    I turn on my car and the engine won't start. The lights and radio turns on and the whine light is on, what's the issue?
    I just put in a subwoofer and the guys at the shop had to jump the car, before that, the car has never needed to be jumped. That was just 6 days ago.
      12/23/2012 ENGINEBUILDER
      Possable constant power draw from new sub wolfer system, Have load check done on battery. Some of these systems draw alot of power and this could be draining battery. I have seen people install a redundant battery to boost avalable CCA .(cold cranking amps). Disconecect fuses from sub system to verifiy after jump starting.