My engine is overheating why?

My 03 Altimas been great, this morning I took my brother to work which is about an hours ride from my house and about half of which is 60 mph. The car did fine there and back but today on my way to pick him up when I was almost to his work my car suddenly started to kind of whistle, I pulled to a yield sign and the car died. It started to get hot so I immediately cut it off. Under the hood the water in the top radiator hose was rapidly bubbling and the bottom hose was cold any ideas?

The fan was on when the car was running and cut off when I cut the car off. Just yesterday I took my car to the shop and had my oil changed and my fluids toped off. They said only my windshield washer fluid was low and they made no mention of water in my oil. I suspect a bad thermostat. My car has 2 thermostats should I replace both? Is there an easy way to roadside test them?

Water pump was seized, I went ahead and threw in the new thermostat anyway. Thank you so much for your advice!

My Altima is always giving a high output of heat and I would only drive for 15 min. Then I also notice when I do my normal oil change at 3000 miles my oil is OFF THE STICK aka NO OIL =(. I read up reviews of my car and theres alot of issues relating to the catalytic converter. What are my options as to resolving this overheating issue. Thanks

My car overheats when I have the a/c on and I run it over 60mph the temperature bar starts rising. What can I do?

My car is suddenly overheating.

I changed or replaced the thermostat at the engine block is there more the one thermostat or just the one? My car is still running hot and not sure why. I replaced the fans, the radiator, water pump, and now the thermostat. Not sure what else it cold be.

Hello, I discovered today my car was overheating, I pulled over and put water in the radiator, I drove for about ten minutes and noticed it was still overheating. I checked the oil and discovered that it was milky in color. Seems water found its way into the engine. I already packed and towed it to my house. What do I do now please?

I replaced my water pump and belts and flushed the cooling system. When I put it all back together and started it back up the engine got really hot. Everything was working before the water pump went out.

I’m assuming there is air trapped somewhere in the cooling system. However, I can't seem to find where it's trapped. I'm hoping the description below might at least help someone point me to where the blockage is, or possibly point to something else that's causing the problem.

Symptoms:
-Car starts out at a good temperature when starting cold, but after a few minutes it overheats
-Air blows out when I turn on the heater but no hot air
-Car runs fine when I turn it on. No rough running or extra exhaust so I would tend to rule out any head gasket problems.
-I can hear the heater core motor running.
-Just before it's about to overheat, the radiator jerks around a bit like it's super hot. The upper radiator hose is boiling hot. The other hose going to the thermostat is cold (which I suspect is normal since the radiator would cool the water on its way down?)
-Both heater hoses are warm, but definitely not hot like the upper radiator hose is. The heater hoses don't feel like they have much coolant running through them.
-Occasionally while the car is idling the RPM gauge jumps up and down from 1000 to 2000. This does not occur when I have the flush n fill cap removed.
-If I take the cap off the flush n fill kit in the heater inlet house I see no coolant. If I run the car for a few minutes and it reaches operating
temperature, some fluid sprays out periodically, but the interesting thing is is the temperature remains down. If I just keep adding fluid to the overflow tank, and let it shoot out the heater hose, the temperature stays down. If I cap off the heater hose again, after about a minute the car starts to overheat. Is this because the hot coolant can't get pass the heater core? This makes me think that the heater core may be plugged.

Actions take so far (all with heater turned on to max and blower on max):
-Replaced the water pump, pulley and belts
-Bled the cooling system 3 separate times following shop manual instructions (finally found the bleeder bolt and made sure it was open while bleeding).
-Took the water pump back off to inspect. Water pump looks fine and spins freely. Looked for any blockage in cooling hoses near water pump and found nothing blocking
-Changed the thermostat, making sure to install it in the correct direction.
-Replaced radiator cap
-Tried cracking open the flush n fill cap just a little but that still causes it to overheat.
-Flushed cooling system with thermostat removed and using one of those flush kits that attaches to the heater hose.
-Tried temporarily removing thermostat, no change
-Turned on A/C and the two radiator fans kicked in. When I run the heater on hot the two radiator fans only turn on if I've opened the flush n fill cap and let a lot of hot coolant escape for several minutes.

Questions:
-Could it be a clogged or bad radiator or heater core?
-What would you recommend I try next? I thought about disconnecting both heater hoses from the engine side and running the garden hose through one to see if it comes out the other end (should tell me if heater core is plugged?). Would attaching the garden hose also potentially clear the blockage?
-If this sounds like it could be a radiator problem, anything I could check on the radiator for overheating?

I have this exact problem word for word. The issue ended up being the bbn previous owner had replaced the water pump. However when they put the serpentine belt they routed it outside the water pump rather than inside smooth side to smooth side belt. This causes the pump to spin backwards and basically does t circulate any water and pumps little water to the top of the radiator. Hope this helps someone.