2000 Alero. Over heating, water blows out the overflow. Replaced water pump, thermostat, intake gasket, and still overheats, then replaced heads, car still overheats and blows out the overflow. Any other suggestions
Did you bleed the air out of the cooling system?? This is a must or it will overheat.
SOURCE: 1999 olds alero leaking coolant
problem could be heads bolts . i put new bolts in put a little sealer on them . make sure your bolt holes is clean free from debris. put a lillte sealer on intake gasket on top and bottom where coolants travel. if all was done . drain engine oil in clean container .set it aside. take radiator cap off .you a coolant pressure rise kit .put a pan under oil pan with drain plug still off .pressure your radiator about 10 psi. make sure you have antifreeze in radiator and engine . when you pressure up to 10 psi look under the car if coolant comes out oil pan. you got leaking head gasket. if not .put oil pan plug back on . put oil back in car . check your freeze plugs also.
SOURCE: Truck overheat after thermostat was replaced. Blows cold heat too
Have you checked the coolant to make sure its full.Try this.Run the truck with the radiator cap off and let it warm up.When it reaches normal temps sqeeze the rubber hoses.These hose should be a little hard to squeeze.If they are the thermo and water pump are fine.
SOURCE: 2000 Malibu keeps running hot.
You replaced the head gasket but did you get the head or heads checked for cracks or check the block for warpage?
SOURCE: I have a 1997 Chevy Malibu that is over-heating.
if you do not turn the a/c on, do the fans cycle? turning on the a/c will signal fan demand - this indicates the the fan and circuits are OK. if the fan cycles with the a/c off, we can move away from a fan issue. if not, look into that. have you tested the rad cap? i believe this model has one cap on the expansion tank and no rad cap, if i remember correctly. i have actually run into one of these cars where an incorrect cap was installed, causing similar symptoms. it sounds as if you know what you are doing, but is there any possibility that there is an air lock in the cooling system? if there is heat coming out of the vents when the car is hot, there is probably no issue there, and also likely means the waterpump is ok. let me know and we'll talk later if necessary, good luck!
SOURCE: my 1997 cadillac eldorado overheats plugs,
Make sure the air in the cooling system is bled out,and make sure the cooling fans are coming on,and going off on there own.If they come on,they have to go off too,when it cools down.If the cooling fans do not come on,bled the cooling system,and replace the coolant sensor,this tells the computer to activate the cooling fan relays.Also check the fuse,and the cooling fan relay.
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yes
Yes bleed cooling system
Then you need it checked for a leaking head gasket, these heads are aluminum and if you overheat the engine they can blow the gaskets again.
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