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The car will definitely not over heat because you haven't put any antifreeze in ,yes some antifreeze's also work as a summer coolant but you can rule the antifreeze out its definitely something else causing your overheating problem is your cooling fan working correctly ?
Hope this helps Nick
You need to put a higher temperature thermostat in. Try a 200 degree thermostat and make sure that you have a full radiator. Also you could dilute your antifreeze a little more than 50/50 .
I would also try a 70/ 30 mix. Hope this helps.
IF you have a motor driven fan it will be connected by a viscous fan hub . replace the viscous fan hub as it is not working and pulling air through the radiator when you need it most. I imagine that the temperature will be higher than normal while sitting at lights . If it is an electronic fan the run fault codes and look for fan relays --fuses-- and temperature coolant sensor, problems.
Check the radiator-it may have blockage. Take it off and turn upside down and flush from the bottom.
If the top hose gets hot, that means the thermostat is opening. The bottom hose should be at least warm, and quite warm if radiator flow is good.
Could be a thermostat problem, or potentially a blown head gasket.
if you take the oil cap off and check under neath the cap (inside of cap) if there is sludge buildup i would get the gasket checked.
Also try check in the radiator, if it looks like there is gunk or **** in the radiator it may be just enough to block the thermostat sensor. Usually if its a thermostat problem the temperature dial doesnt move.
Firstly would check for head gasket, thermostat and note how fast it heats up, when does it overheat (on idle, driving on highway, driving round town, etc)
If your car ran hot, you may need to check the radiator for a leak. You always need to add antifreeze/coolant when you add water to your car. Check you owner's manual for the type they suggest and the proper mix of water to antifreeze/coolant. I had to get a head on my motor shaved when my car ran hot and later I had to get the hoses replaced. My radiator cap died following my replacing the radiator as it was plastic and when the car overheated it damaged the cap. How long was the car running hot? You don't want to be a penny wize or a pound foolish when it comes to engine overheating problems. You can repair on the cheap now and pay a lot more in the long run. Also, in the future when your car runs hot, you can turn on the heater --yes even when it is hot outside--I recommend opening up the windows. The heater fan will help to dissipate the heat from the car engine. It does work. I hope these help. Also go to a reputable repair shop. It could be your thermostat they can have check valves which get messed up but you need to check to see if it is your radiator or if there is a leak there or in a hose.
Have you changed out the thermostat and checked for exhaust blow by from a head gasket leak? One quick way to check for blow by would be if you start the car with the cap off on the radiator and see if antifreeze begins to rise up in the radiator before the engine warms up. Exhaust leaking into the water jacket will bubble up through the radiator. This hot exhaust gas will cause you to overheat. A stuck thermostat will keep the antifreeze from ever reaching the radiator to cool down also causing you to overheat.
You probably never cleaned the cooling system out.
If you have not get it done by pros.
It seems something is blocking the flow. If the water pump went bad you will know. Rarely ever heard a impeller breaks off like you think. The bearings and the seal break first.
Check and see also if the heater valve is working.
As for the over heating even new thermostats fail. Reverse flush is needed or the procan measure the pressure in the radiator cooling system and edetermine if there is a engine pressure problem. Tools and experience is the key in the game of diagnosis.