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Not a major task on your Cutlass...trace the upper radiator hose to the top of the motor...(intake manifold) you will find the thermostat inside the housing connection...held down by 2 10mm bolts...your replacement should be rated at 195 degrees...(usually the only one available for your V-6...Be sure to inspect your hoses for wear...you will lose (spill) some anti-freeze while removing the thermostat housing...I also recommend to buy a housing gasket as well as the inside gasket seal...these do not always come with the thermostat...Also use gasket sealant as no leaks are attainable...:) Have some anti-freeze handy to top off your overflow system after the installation is complete...you need to inspect while idling to be sure no leaks, and correct amount of anti-freeze in your overflow...2 measures are engine cold...and engine hot...Hope this helps...:)
If its leaking from the front where the drive-shaft connects, it needs a new pinion seal. If its leaking from the rear cover you need to remove cover and replace the gasket. If its leaking at the wheels you need to replace the axle seals.
more than likely a vacuum leak. the pcv hoses on these are known to leak as well as the intake gaskets. need to look at the freeze frame data on a scanner and see if it set the codes when it was first cranked, if so its prolly intake gaskets as they leak and **** air when the engine is cold. a vacuum leak would more than likey set it anytime
pull off the tranny inspectiont cover and see if its wet in there, if it is its prob the front tranny pump seal if not and it is anti freeze youve go a hose leaking or intake manifold gasket leaking or a head gasket leak!!! either way the 4 wheel drive would have nothing too do with any of the leaks !!!!
Look at the water pump and rubber hoses.. Start by topping off the radiator with fluid. Any leaks yet ? Then start the truck to let it run and warm up and build up pressure.. Observer the engine and note where the water sprays out.