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A worn water pump is the most likely. If the coolant is going down, the water is going somewhere.
The most common reasons an Oldsmobile Alero is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat. Coolant leak (water pump, radiator, hose etc.)
-Remove the thermostat and flush the engine back and forward couple time with water. Then re install the thermostat back to. Make sure the thermostat's spring or bottom go inside the engine.
-Make sure the water pump is in good shape, belt drive the water pump must be good tight.
-Try this you should be good to go.
my 98 Blazer I had to replace radiator water pump heatercore and hoses. Had head gasket go. Once that happens air and dexcool corrode cooling system. Do you smell antifreeze? Are you loosing antifreeze? Check oil see if its another color not clear or black but i think light brown. Have you flushed out system?
HI there if you coolant is not circulating and you replaced pump &thermostat and heater core and still over heating. Your problem is your radiator is clogged you can replace it or tack it too a radiator shope and them flash coolant system. this should fix your over heating problem . OK
You say "Water pump thermostat" do you mean Thermostat or water pump? If you replaced the thermostat and still have an overheating problem then look at the water pump itself as the problem if that is replaced and you still have the problem then you have another problem in the engine or a clogged radiator core. You may have a lubrication problem in the motor, if the oil pump went out or your low on oil then the engine may be overheating from lack of lubrication. Another thing that will cause overheating is if the Fan is Electric and not activating or if the radiator fan is mechanical the clutch is not allowing the fan to rotate free when you are driving.
Water pumps are not normally what causes overheating, in fact that would be my last item to change. The only way that a water pump fill cause overheating is if the impeller has come off the shaft or completely worn down. I would first start with the thermostat. If this dosn't fix it, then I would be looking at the condition of the radiator I.E. is it plugged, are the fins up front full of bugs and debrisect. Then I would also check the cooling fan operation, does it come on when engine is hot? also does it come on with the A.C. operation-it should. Then last of all the water pump- and no its not easy on this one, due to lack of clearance.
Did you install a new thermostat and make sure to bleed all the air out of the system when you replaced the radiator? If you didn't, or installed a Stant thermostat, replace it with a FACTORY OEM thermostat. Make sure the cooling system is bled by opening your radiator cap (WHILE THE CAR IS OFF AND COLD), starting the car and running the heater. Add coolant to the radiator as the engine heats up, until is at normal operating temperature AND starts spitting coolant back out.
Hope this helps, matt
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If your thermostat aint seized shut, its your heater core. You need a new one. Your heater core is another element that makes the antifreeze move in a circular motion. If it aint moving in a circular motion, your car is overheating, meaning that it could be your thermostat, heatercore, or waterpump, but I think that its your heater core. If it is your water pump, your check engine light would come on.
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