Yes, it could be a few issues, I always believe to go the cheapest route first, so you are not just replacing parts to be replacing, Based on your description, Normally it would not be overflowing if your pump is not working, It could be a clogged hose, you would have to flush system to see if that was the case, but based on my feeling, i believe it is a stuck thermostat, If your tank is overflowing, it would have to be a main hose block, but i don't believe that is the case, i would have thermostat replaced, to confirm that, for a around 50 bucks (if you stay away from dealer) you can have the radiator flushed, which is a good idea anyway, then you will know for sure it is the thermostat, and they can put that in after they flush it, or you can put thermostat in, pick there brain, when they flush it, and they can point where it is, it is just a couple of bolts to take off, clean gasket area, replace with new gasket, after of course taking old thermostat out and replacing with new one.
I hope this helps you, (again, i think it is thermostat that is stuck) thanks Mike from fixya
Could be waterpump...impellers could be rusted away making it unable to circulate water efficently, but you'd think the pump would weep first.
Could be the thermostat or an obstruction.
Replace thermostat would be the least expensive.
Then, maybe a back flush.
Then, the water pump.
Hope I helped a little.
I watched a youtube video hours ago on the same issue....Radiator cap faulty....Its supposed to send excess coolant to resovoir but its also supposed to pull coolant from resovoir back into radiator....valve on cap is faulty
Make sure the cooling fan(s) are coming on, especially in stop/go situations. and make sure coolant level is ok. causes, a defective thermostat that will not open, poor airflow through radiator, or a collasped lower radiator hose, or even a defective radiator cap. good-day ! also a plugged or dirty radiator.
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