The coolant could be getting into your oil, or it could be going out the exhaust from a blown head gasket or a cracked head you will probably be able to smell a sweet smell near the exhaust if its being burned...
Try a new radiator cap. Much cheaper fix, then above.
These engines are also notorious for blown intake manifold gaskets. If the leak is not evident, check around the top of the engine and along the sides of the heads for signs of leakage. A service center can pressure test it for a nominal charge.
You may have a bad head gasket and it may be leaking from that. Why when cold i dont know, but if you are losing coolant it may be the head gasket.
have coolant system pressure tested and look for the leaks
Losing coolant with no apparent leaks, White smoke out the exhaust that has a sweet smell to it,
The radiator cap might need replacing.
That means the engine is running HOT. Need to check the coolant level and check for coolant leaks.
If you are losing coolant, which would cause overheating, you need to check for leaks. If the coolant is fine, the next step is to replace your thermostadt (cheap.) If that doesn't work, either you got a bad thermostadt, or you need a mechanic to check it out. If you haven't noticed any leaks on the ground, or steam gushing up, chances are it's the thermo--assuming you have coolant in the radiator. Check that first--on a COLD engine, not after it's hot!
To check for a cracked block or engine failure on a 2000 Chevy Cavalier, start by inspecting the oil for signs of coolant contamination, which can appear as a milky or frothy texture. Next, check the coolant for oil residue, which indicates an internal leak. Additionally, perform a compression test on the cylinders; low compression in one or more cylinders may suggest a crack or gasket failure. Finally, look for external leaks or visible cracks in the engine block itself.
* Failing head gaskets * Warped heads * Cracked engine blocks and heads * Coolant leaks to the outside of the engine through a breach between the head and block * Coolant leaks through the headbolts * Intake manifold coolant leaks * Overheating due to a cracked head or block * Oil leaks into the cooling system (Radiator) * Coolant leaks into the oil * Excessive steam and water from the tailpipe i know the 60 series pretty good and the first thing i would check is the oil cooler, if that checks out i would check the liner o-rings by pulling the oil pan off and pressure testing the coolant system
check for exhaust leaks around the manifold inlets and outlets.
A 2004 Chevy Suburban may leak radiator coolant due to several reasons, including a damaged radiator, worn hoses, or a faulty water pump. Additionally, a leaking head gasket or a cracked engine block could also cause coolant to escape. It's important to inspect for visible leaks and check the coolant level regularly, as neglecting the issue can lead to overheating and engine damage. If you're unsure, consulting a mechanic for a thorough inspection is advisable.
A 2000 Chevy Cavalier typically has two freeze plugs, also known as core plugs, located on the engine block. These plugs help prevent damage from freezing coolant. It's important to check them regularly for leaks or corrosion to ensure the engine remains protected.
To replace the water pump on a 1998 Chevy Lumina, first disconnect the negative battery cable and drain the coolant. Remove any components obstructing access, such as the serpentine belt and possibly the alternator. Unbolt the water pump from the engine block, clean the mating surfaces, and install the new pump with a new gasket. Finally, reassemble everything, refill the coolant, and check for leaks.