Hello I have a old 94 cavalier... and before it was leaking all the coolant out of it. I couldn't understand why i just kept filling it up... I replaced the thermostat and I replaced the whole radiator... I thought i was done fixing it when all of a sudden its leaking really really bad under the left side of my car. I jacked it up and tried to find the leak but i just can't seem to find where it's pouring out from... What is wrong with it.. If you need any more details I would be gladly able to help.
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Re: 94 cavalier 2.2liter cooling system problem
Hello, you are wondering where your coolant is going to. If the waterr is leaking on the passenger side firewall the heater core may be leaking (which is common) in cavaliers, but if it is leaking at the motor it is probably the headgasket the are bad about leaking also, but if it is not bad enough Gm has made some pellet type stop leak that comes in a pack of six. Crush three to four and put them directly in the radiator these actually work great better that any I've seen in part stores, and they're inexspensive also. And I havent had them stop a radiator up either. The others will ! They even put these in brand new Cadillacs From the factory. Buy the ones at GM only. Thank You I hope this is a help.
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have you replaced radiator cap with the proper pressure cap? if so you may have a head gasket letting some compression into cooling system building too much pressure so the cap is bleeding it off into resevoir
the fuel system is seperate from heating system.check water pump the impeller could have deteriated i have seen this in another cavalier,once i removed water pump the blades that move the water were full of holes.but first make sure ther is good flow to the heater core.also hope you used a 50/50 mix of antifreeze because solid antifreeze wont heat up.
if there is a leak then of course you will get overheating from the engine..Be very careful as this can cause permanent damage to the head gasket and it will cost a lot more to fix..First try to stop this leak before you proceed further.
You did not mention what engine you have, so I assume it is a 2.4L and has any radiator stop leak been added to the coolant system lately?
If no radiator stop leak has been added, the good news is you don't have coolant in the oil.
I would speculate you have a head gasket problem. The oil pressure is higher than the coolant pressure, therefore the oil has the abiltiy to enter the cooling system. There is an oil pressure supply galley that runs between the engine block and the cyliner head to supply oil to the cam followers. That is most likly where the oil is getting in.
Unfortunatley the head gasket will have to be changed.
Let me know.