Question about 2002 Oldsmobile Alero

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Over heating problem

I have replaced the radiator and the thurmostat water pump seems to work fine, but over heats in about 20 - 35 min. just siting in drive,

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The best time for a vehicle to overheat is sitting still. Fans should come on after 10 minutes of sitting still. If they do not come on, you could have a bad relay or temp sensor.
Also using a thinner oil like 5W30 in the summer time. Or you could go with synethic which adjust to all climates and temperatures.

Using exactly a 50/50 coolant mix is required. No more than 60water/40coolant.

Lastly, check thermostat or replace, check water pump, and check to make sure exhaust is not plugged.

Posted on Jul 17, 2009

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First, anytime a thermostat is overheated, it's ruined.

Second, if this car has electric fans, are they running when they are supposed to? If not, replace the fan control module, and/or test/replace the fan motors.

When the radiator was replaced, were you certain to purge the radiator and engine of all air before replacing the radiator cap? When you refill an emptied system, you always start the engine and watch the fill level in the radiator, refilling as necessary until you know the thermostat has opened. You need to have the heatrer controls set to full hot as well. Once the radiator is filled, put the cap in place, and fill the reservoir to the level indicated for a hot engine.

Finally, check to make sure the lower radiator hose is not collapsing while driving. While this is difficult to check (because your going down the road), just replace it when you replace the thermostat.

All of this assumes you do not have a cracked head or blown head gasket.

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check to see if the lower radiator hose is collapsing, if not then take the fan belt off and check for slop in the water pump. Somethimes the pump can go bad and not leak. let me know if this works out for you.

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