I had the same problem. I replaced the water pump, radiator, thermostat, & the bottom "t" hose, plus new coolent. Turn the car on over flow right away. After many hours of trying to keep the coolent in I figured out I had an air pocket in the heater core, because no coolent was reaching there. No heat in the cab of the car. So I pulled the heater hose off the thermostat hosing, put my garden hose on the heater hose hole & filled it up. Problem sovled.
I f you have a blown head gasket and the hole is small you can get away with radiator stop leak for awhile, it happend to me and it lasted for years good luck
You are not going to like the answer, but it sounds like you have a blow head gasket. To check to see take out the oil dip stick, and if the oil look like a chocolate milk shake then that it the problem, so you would have to take it to a shop, thats a big job.
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Check to see if you have flow through the entire radiator.If part of the radiator core is cool to the touch when the engine is at operating temp, this indicates restricted radiator flow. If the entire radiator core is not allowing water to flow through, cooling will not be at all efficient. Also a good idea would be to purchase a block tester. available at napa and other reputable parts houses for around thirty dollars. You remove a small amount of coolant, and put the tool in the radiator, or pressure tank opening. If there are any combustable gasses present, i'e' exhaust, this would indicate a head gasket breech, (or maybe worse) and would indicate that it's time to stop looking for a simple problems, and get proffessional help. Good luck to you!
Falty Thermostat, Not enough coolent in vehicle, Plugged radiator. Has the coolent been flushed? They use Dexcool in the gm vehicles and it is known to gum up the system if proper flushing intervals have not been followed. Long life coolent lasts for 5yrs but should be changed every 3yrs.
If the water is flowing into the overflow tank then it is probably running a little hot. It is normal for a little bit to flow into if as the water heats and expands but there shouldn't be enough to overflow the tank. Have you tried changing the thermostat? If the thermostat isn't opening properly this will have all the effect in the world on how hot your engine runs.
I will agree with your uncle and say that you should check the water pump. Start the vehicle and look at the water pump. Most water pumps have a "weep hole". If there is coolant coming out of this hole the water pump is not working properly. If not, and if the temperature has been running normally, you may have fixed the problem when you replaced the cap, if the water pump is good and the temp has been running high, then check the thermostat. Hope this helps and good luck.
if you get an overflow through the resevior it's often times because the thermostat with stick shut causeing excess pressure. seeing is the car is not overheating this means that the trhermostat is opening but when you get that overflow it's sticking i would replace the thermostat as soon as possible to resolve this issue