Engine overheats when driving or just sitting idling, coolant fans engage and run properly. Radiator is low on coolant, topped off and it pushed the coolant out the overflow tank. Upper hose is hot and lower hose is cold, no signs of coolant leaking externally and no coolant found in engine oil. Is the waterpump out? Thermostat was replaced three months ago.
Time for Intake Gaskets and possibly head gaskets, very common problem with these, the intake gaskets go bad and the coolant actually burns in the cylinder and of course the cylinder pumps air into the coolant system because of intake gaskets being bad. :-(
SOURCE: I have a 2000 Olds Silhouette that keeps running
That engine is FAMOUS for the intake manifold gaskets to leak. Does it run hot all the time or only when its low on coolant. When its hot and the fans are on, is the air coming through the radiator HOT? it should be, if its not HOT or LUKE WARM, the radiator isnt flowing coolant. Make sure the water pump isnt leaking. The thermostat is a pain to replace, so make shure its bad before replacing it. Does it run hot sitting still or going down the highway? If it cools on the road, check the cooling fans. They only work when the a/c is on OR till the engine is approx 230f or so.
SOURCE: 2001 Olds Silhouette overheating, please help
It have to be the thermostat if the water is still in the tank and the hoses on the radiator have all the pressure the water is not going in, replace the thermostat and you will be fine now the thermostat is located under the intake black hose the goes to the air filter ,take that off that way u would have enough room to get to it take the 2 screws off and is out. I hope that help you .
SOURCE: Olds silhouette heater blows cold air
as long as the engine temperature is normal, i would suspect a clogged heater core, the dex-cool antifreeze is notorious for building up deposits in cooling system. have heater core flushed first to see if it makes any difference
SOURCE: engine overheating-----1994 Olds Cutlass Supreme 3.4 liter v/6
There seems to be an air pocket or no antifreeze in engine block. Try this method disconnect upper radiator hose and pour water directly into hose down into engine block until it full. when its filled reconnect hose and fill up radiator. as the vehicle warms up open bleeder valve on the thermostat housing and release air from system. open slowly and BE VERY CAREFUL WATER WILL BE HOT, bleed until you get a steady stream opening and cosing valve. However if all of this don't work. You may have a bad pump. Good Luck
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