The battery needs to be inspected. http://alltypesofpartsreplacing.blogspot.com/2012/11/car-battery-warning-light-battery.html --------- These will help. Thanks.
There is step by step procedure to test and inspect battery,that will confirm the problem.
Click the link below to go through its procedure:----
SOURCE: 2004 GMC Envoy has trouble idling
Try the fuel filter. Sounds like the engine might be running rough due to weak fuel pressure. Its cheaper to replace, especially if it's still original from 04. Try running some injector cleaner through a couple of tanks of high octane gas.
SOURCE: Instrument gauges in 2004 envoy
ours did this, it was the guage cluster that went bad. It's about $600 to replace
SOURCE: battery removal on a 2004 GMC Envoy
The battery is on the right side behind the fuse box. You need a metric set to undo the 3 screws. Theres one that attaches to the body, one to the bar that goes along the top, and theres one on the left side below the vacuum hose and air induction. After you've taken out those three, you should lift the whole thing out(battery and shroud) together. It's hard to take the shroud off before you lift the battery out. After that, you have to pry the shoud off the battery. The two terminals in the back make it hard. Then just go to any auto parts store and they'll give you a new one.
SOURCE: No cold air w/air conditioner on for a 2004 GMC Envoy.
Can't go by the pressure. Ck the large lone coming out of firewall, should be col. Small line at ac condensor in front of radiator should be hot.
Static pressure on high side probably 80psI Running 30 on the low side and 1130. will vary depending on oiutside temp Hope this hekoped
SOURCE: 2004 gmc envoy code 0128
This an engine coolant temperature fault, most likely caused by a defective thermostat, probably one that is open all the time.
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