Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . Specific instructions for your car are as follows. Let me know if you get stuck or have more questions. 5.3L Engine
Removal & Installation
4.2L Engine
To install:
NOTE
The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
To install:
Removal & Installation
4.2L Engine
To install:
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Fig. Thermostat mounting-4.2L engine
Fig. Remove the outlet from the intake manifold
Fig. Remove the thermostat from the housing
4.2L Engine
1. Remove the necessary coolant from the radiator.
2. Remove the alternator, as outlined in the Engine Electrical Section.
3. Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
4. Remove the thermostat housing bolts.
5. Remove the thermostat housing from the engine block.
6. Clean all of the surfaces of the thermostat housing.
7. Clean the sealing surface of the engine block.
To install:
Fig. Thermostat mounting-4.2L engine
1. Install the thermostat housing to the engine block.
2. Install the thermostat housing bolts and tighten to 89 inch lbs. (10 Nm).
3. Lubricate the inner diameter of the radiator hose with engine coolant.
4. Install the outlet hose to the thermostat housing. Secure the hose with the clamp.
5. Install the alternator.
6. Fill the cooling system with specified coolant and concentration.
7. Inspect all sealing surfaces for leaks after starting the engine.
4.3L Engine
The thermostat is located between the water outlet and a housing built into the intake manifold.
CAUTION Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
1. Disconnect the negative battery cable.
2. Remove the air inlet duct.
3. Drain the cooling system to a level below the thermostat.
4. Remove the thermostat outlet-to-engine retainers (usually either 2 bolts or 1 bolt and 1 stud), then remove outlet from the intake manifold.
5. Remove the thermostat from the housing, noting the orientation for installation purposes.
Fig. Unfasten the thermostat outlet-to-engine bolts
Fig. Remove the outlet from the intake manifold
Fig. Remove the thermostat from the housing
To install:
1. Carefully clean the all traces of the old gasket or sealer from the housing and outlet.
2. Install the thermostat to the housing, oriented as noted during removal, then position a new gasket (if used).
3. Place a 1 / 8 in. bead of RTV sealant in the groove on the water outlet sealing surface, then install the outlet while the sealer is still wet.
4. Install the outlet retainers and tighten to 14 ft. lbs. (19 Nm).
5. Properly fill the engine cooling system and check for leaks.
6. Install the air inlet duct.
5.3L Engine
NOTE The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
1. Drain the cooling system to a level below the thermostat.
2. Remove the radiator outlet hose.
3. Remove the water pump inlet bolts.
4. Remove the water pump inlet and thermostat from the water pump.
To install:
1. Install the thermostat and thermostat housing to the water pump.
2. Install the thermostat housing bolts. Tighten the bolts to 11 ft. lbs. (15 Nm).
3. Install the radiator outlet hose.
4. Properly fill the engine cooling system and check for leaks.
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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: Changing a headlight on a 2004 GMC Envoy
If it's the same as a Trailblazer you have to first remove the "bowtie" from the front between the two light bezels. Gentle pull forward and the pressure clips will release. Don't be shy. There are no screws. Than with the light bezels exposed you will see a metal clip that has to be pulled back to release the bezel and it will swing forward to allow you access to the bulb.
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.
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