Question about 2004 Chevrolet Venture Passanger
Not familiar with this specific model, but usually the thermostat housing is on the engine where the upper radiator hose attaches. Remove the upper hose at the engine (drain the coolant first of course), and you should see a couple of bolts that hold the housing onto the engine. There may also be a small bypass hose (about one inch in diameter, and 4 to 6 inches long) going from the housing back to the engine. If so, remove it from the housing as well.
There is a drain on the bottom of the radiator, on one side. It usually has a little handle on it, and turn the handle counter-clock-wise to open it. It may be only 1/4 turn, or it may turn several times.
There may or may not be drain plugs on the engine block itself, some engines have these and others don't. They will be near the bottom of the engine block, just above the oil pan, you will have to be under the engine to find them. There may be one or more, they may be on one side or opposite sides.
Posted on Sep 05, 2010
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Posted on Jan 02, 2017
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Should be located in a removable housing at the engine end of the upper radiator hose
Drain about 1 gallon of coolant from the radiator
Remove this housing
Note how thermostat is installed
Clean both surfaces
Replace thermostat and gasket
Re-fill coolant slowly to prevent an airlock
Start engine and look for leaks
Run engine to normal operating temperature with heater on
Re-check coolant level
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