Question about 2004 GMC Envoy

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What is wrong with the air system on my gmc?

This morning I tried to turn on my truck and is was completely dead. I replaced the battery and noticed that even with the engine off and the key removed the air continued to run inside the truck.

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You probably have a defective HVAC Control Module

Posted on Jan 02, 2013


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 90 Answers

SOURCE: 2005 GMC Sierra Overheating

If your sure there is no trapped air in system after refill and air bleed off, is fan clutch pulling good air thru radiator? Even if it is, the heater should have coolant as hot as what temp gage is showing! Try backwards flushing heater core (dex cool is notorious for plugging these up). There is a TSB for cracked cylinder heads from GM for unexplained coolant loss.Remove drivers side valve cover, and look at center three head bolts for coolant around them, if coolant has been getting in thru this suspect area, there will be a milky/pudding like goo under valve cover and on head. GM had a company called Castec cast these and the areas near the head bolts were found to be too porous (NO recall YET!) Ya, you guessed it, replace heads! Unfortunately, if its gotten hot to many times, it has probably hurt the heads/gaskets. Hope this helps. PS: The castec logo is under the rearmost pair of rocker arms,may have to remove them to see.

Posted on Feb 05, 2009

  • 6674 Answers

SOURCE: key is on....battery is good....engine won't turn over

Black box (plastic) usually pretty handy to battery, you should see red (usually) cable from battery running to it. Another thing that came to mind, you don't have anti-theft system on that do you? Sometimes they will cause problems after a dead battery. Try using your key & valet key to unlock the doors, manually especially drivers.

Posted on May 18, 2009

  • 8 Answers

SOURCE: 2000 GMC Sonoma starting problems

I would suspect the fuel pump

Posted on May 28, 2009

  • 1 Answer

SOURCE: On my 2007 GMC Sierra

I have the same problem on my '07 gmc 2500. I understand there is a problem with the "cannister filter for emission control of fumes from gas tank" (or something like that). Apparently, it is located near the gas tank which causes it to plug up easily from road dust. The fix is to relocate it with long hoses into the engine compartment area. Since the filter alone is $250 (or so I've been told) with labor it's a $350-400 fix. Supposedly, there is no damage that can be done so I'm just tooling along without worrying about it until I have to put the truck in the shop for something else. Seems there ought to be a recall for this, by government motors won't come out with it.

Posted on Jan 16, 2011

  • 1311 Answers

SOURCE: replaced battery on 2002 gmc envoy. now it goes dead when air is

You need to clean your throttle body, make sure to clean both front and back sides thoroughly.

Posted on Oct 27, 2011

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Jun 28, 2012 | GMC Cars & Trucks

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I do not have any air coming out of the dash. The battery went dead while on vacation. I changed the climate control acuator and still have no air coming out of the dash. Only the floor and defroster.

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Jun 04, 2012 | 2004 GMC Envoy

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Battery was dead this morning.then jumped it off.gmc 2002 denalli 6.0 then said reduced engine power on message center

Dead batteries can cause all kinds of goofy things to happen. Computer systems do not like it much when they get starved for power and can set all kinds of codes that may make the the thing operate in reduced power mode. This simply means that the computer is limiting engine RPM because of some problem that it "thinks" it has. Again, low power makes computers delirious....they can think all kinds of false things. The fix would be to make sure your battery and charging system is in good operating condition. (Did the battery go dead for obvious reasons like lights left on? or is it worn out and needs to be replaced?) Once the battery and charging system has received a clean bill of health, you may need to reset all of your computer memories - you may have to reset ALL modules. i.e.airbag, body control, antilock brake, air suspension, etc.

Mar 05, 2011 | GMC Denali Cars & Trucks

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My battery is brand new and my alternator is new both in good working condition but somehow overnight my battery drains.Even after a full charge in the morning i would have a dead battery. help me

you are looking in the wrong place. something is draining the battery while the ignition is off. replacing the battery and alternator is never going to fix this. you have to have someone troubleshoot the electrical system and figure out which doodad is killing the battery. usual
suspects are lights which aren't noticed as in the trunk and glove box, the anti-theft and door lock systems, remote start, clocks,etc.

One of those buggers is draining your system, you have to find it and kill it.

Dec 14, 2010 | Chevrolet Impala Cars & Trucks

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It sounds like you have a charging system problem. When you turn on the A/C the alt is not keeping up with the required ampre. I hope this helps.
Thank You,

Aug 04, 2009 | 2004 GMC Envoy

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Fuel injector replacement goes horribly wrong.

We had the same problem with a 95 Jimmy, Drain your oil, and if you get more than 5 qts it means the injection system failed and filled the bottom half of your motor with gas. You can simply check the level on the dipstick and smell it first before draining. We drained and replaced oil and filter, and the expensive injector assembly, but the motor only lasted 4 months after that and now I am replacing the motor in it. Check around to see if there is a product on the market to save the bearings in your motor before going through all the expense and work. Happy motoring.

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