SOURCE: 2004 gmc sierra rear differential
remove cover.take off back wheels and calipers (or drums).turn differential to where you see small bolt/pin (5/16) horizontally (same direction as axles)on right side of differential.remove bolt/pin.A large pin (about 5"long 3/4"diameter) should slide out differential with ease ( you may have to tap one side of the large pin).turn differential to completely remove large pin.turn differential so you can see in the view window.push each axles in (they'll go in about 1 1/2"each) You may hear one of the axle C-clips fall.If not use a small telescoping magnet to remove the C-clips from the axles through the differential window.pull each axle out about 10"so they are out of the diff.Now remove the cap bolts(4-5/8"bolts) and remove the caps(mark the caps so they go in excactly the way they came out.be careful the diff might fall out.If not you may have to use a long bar or 2x4 to wedge and pry the differential out. Have a basket/crate w/rags in it to catch the diff.TIP:If you are removing the ring gear from the diff, the bolts are left handed bolts meaning you have to turn them clockwise to loosen and counter clockwise to tighten ; )
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SOURCE: where on the radiator is the drain petcock 2004
Some models do not have a petcock, pulling the lower radiator hose will suffice in drainage. I suspect you know what you are doing since you have the correct nomenclature. Use extreme caution during this type of draining procedure when coolant is hot. If it is not on the lower left or right corners of radiator side facing engine, it is not equipped with a drain valve.
SOURCE: 2004 gmc 1500 sierra heater control stuck on
Defrost is the default position. Is the control a autyomatic temperture control unit? ( you set the temp and select automatic) if it is the system is completely electronic. You push the buttons and the control still says defrost or can you select something else and the control shows it but it just keeps coming out the defrost? If the control changes and the air comes out the defrost anyway and the cheack engine light isn't on, then the problem can be blown fuses or an air door actoater not working. Does the dash emit a clicking sound? if it does with the covers off the bottom of the dash reach around touching the different pieces till you touch the idem that is clicking. this is an acutor motor, or blend door motor. they have gears in them that wear out and break the motors aren't repairable and you just replace the ofending motor. the door that is moves can be stuck. and may have to be freed up with blaster, WD40, or other rust buster till it moves easy. maybe after getting the door to move smoothly you can get the old motor to move the door wiithout having to install a new one.
SOURCE: 2004 GMC Sierra 4dr truck. the fan does not work
The switch or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Sierra running 100% again soon.
SOURCE: replacement of water pump on 2004 gmc sierra
Remove or disconnect the following:
Air outlet duct
Coolant
Inlet radiator hose from the water pump
Upper fan shroud
Cooling fan and clutch assembly
Drive belt
Radiator outlet hose from the coolant pump
Surge tank hose
Heater hose
Water pump
DO NOT use cooling system seal tabs (or similar compounds) unless
otherwise instructed. The use of cooling system seal tabs (or similar
compounds) may restrict coolant flow through the passages of the
cooling system or the engine components. Restricted coolant flow may
cause engine overheating and/or damage to the cooling system or the
engine components/assembly.
Install or connect the following:
Water pump. Install the water pump bolts. Tighten the water pump
bolts first pass to 11 ft. lbs. (15 Nm); tighten the bolts final pass
to 22 ft. lbs. (30 Nm).
Water pump drive belt pulley and bolts (if applicable). Tighten
the pulley bolts first pass to 89 inch lbs. (10 Nm); tighten the bolts
final pass to 18 ft. lbs. (25 Nm).
Surge tank hose
Heater hose
Outlet radiator hose to the coolant pump
Drive belt
Cooling fan and clutch assembly
Upper fan shroud
Inlet radiator hose to the water pump
Air inlet duct
Coolant
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