The radiator drain on a 2004 GMC Sierra is located at the bottom of the radiator, typically on the driver's side. It is a small petcock or valve that can be opened to allow coolant to drain from the radiator. To access it, you may need to get under the vehicle or use a flashlight for better visibility. Always ensure the engine is cool before attempting to drain the radiator to avoid burns.
The 2004 GMC radiator drain is located on the bottom of the radiator. The radiator drain plug can be removed with a half inch ratchet.
Bottom of the radiator.
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bottom driver side of radiator
You will find that it is located on the bottom of the radiator. If you do not find a drain Petcock on the bottom of the radiator you must remove the lower radiator hose in order to drain the radiator.
Open the petcock at the bottom of the radiator and drain into a pan. If there is not a petcock, then remove one end of the 94 GMC Sierras bottom radiator hose to drain the system. The coolant is toxic to animals so dispose of properly.
in the radiator reservoir
On a 2001 GMC Savana 5.7 V8. There is no drain plug. You actually have to remove the big hose that joins the engine to the radiator. This will drain out all the fluids.
Bottom corner of the radiator, on the passenger side.
To drain the radiator in a 2004 GMC pickup, first ensure the engine is cool and then locate the radiator drain valve at the bottom of the radiator. Place a drain pan underneath, open the valve to let the coolant flow out, and close it once drained. Alternatively, you can remove the lower radiator hose for a more complete drain. Always remember to dispose of the old coolant properly.
The only way to drain all the coolant is to unhook the bottom radiator hose. The radiator does NOT have a drain vale.
it could be the thermostat or it could have a leak in theradiator's hose or radiator