20 Most Recent 2004 Hummer H2 - Page 5 Questions & Answers

if its running poor or stumbling then you have some wires/plug not firing correctly, this means a bad wire/ bad plug, or you mixed a few of them up. go back over them again and make sure you have everything hook up right.

the body control module controls that area which will not hurt it one bit if converted over to manual shocks. The warnings will come on but can be ignored. It is your choice

Most likely this is a gas cap issue. That is always what it is when I get that. Usually all I have to do is tighten the cap down correctly and then reset the code.

you check all fuses?

gm dealer ---- parts store ----transmission shop

The head light switch is shorting.Get the head light bypassed and connect the switch terminal together and then check.The headlight should turn off when ignition is turned off.--------- If the headlights turns off , with ignition off when you by pass the switch, this clears that problem is head light switch.------------- But if you by pass the head light switch and still the same problem, then it can be problem related to ignition switch.-------- With the ignition turned to off position, measure voltage at ignition switch harness.If you notice voltage,m then switch is faulty , and if there is no voltage then switch is working.In that case the problem relates to BCM (body control module).The BCM (Body Control Module) is located behind the headlight switch.-------- But first possibility is faulty/ shorting head light switch or its wires.---------Inspect that.This will help.Thanks.Helpmech.

The accident probably caused the rear air suspension to leak and the compressor is having to run constanly...have it inspected for air leaks before you burn the compressor up. I hope this helps.

likely either a linkage heater air actuated door may also be vaccumed controled seek manual for air ducting for your model.likely vaccum actuated switch.

Unfortunately, lots of moisture and junk can get up there and kill the bulb. Remove the bulb, inspect it, inspect the connections. Make sure there is no rust and junk in there. If one bulb is working and the other is not, replace the bulb. Believe me, I have seen stranger things happen... but with one working it is not the relay or the fuse.

If the AC light does not stay on after you push the button and the air does not get cold coming out of the vents the system has a leak and has been evacuated. Once the pressure falls below a certain level the pressure sensor in the AC system tells the AC clutch to dissengage and the light on the dash will also go out to alert you that the AC system is not functioning correctly. The reason it flashes when you push it initially is that the system is trying reading the system pressure and finds none.
<br>Sgt Lumley

Call first to confirm but most of the chain auto parts stores will do a free scan of your computer and retrieve the error codes you need to start troubleshooting.

You need to replace the Fuel Pressure Regulator talk to your mechanic, dealerships usualyl charge 80 dollars for diagnosing this.

Sounds like the ac compressor locked up and the belt snapped from rubbing on it. Once the belt snaps, the water pump stops and the engine overhears.