Car is overheating...please help.
Start the engine with the radiator cap "OFF". Start the engine and stand there until the t-stat opens up and you see the coolant start to flow and/or the coolant level go down. Then top it off with new coolant/water. The t-stat will now close and the flow will stop. You need to stand there until you see it start flowing again. If the level goes down again, top it off again.
****But if your engine is just getting hotter and hotter right off the bat after start up, most likely your t-stat is stuck closed. You could have an air bubble near the water pump too, but if you do the process I described above, that will get all the air out.****
Make sure while you're standing there waiting for the coolant to flow, that you keep going back and forth checking the temp gauge to make sure you're not sitting there overheating. Because if the t-stat is stuck, you won't ever get that flow.
And like "conan" said, every single part of the cooling system needs to be fully primed with coolant, always. If you're getting air in the system, you have bigger problems.
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Did you keep topping it off until the level DID NOT drop anymore AFTER the coolant started to flow the last time you topped it off?
Also, when the temp gauge does read almost into the red, how hot is everything under the hood? Like, can you put your hand on top of the intake and leave it there no problem? Can you wrap your hand and fingers around the throttle body and leave it there without burning your hand?
I ask because you might not be overheating, you could have a bad temp sensor. If your temp is getting close to the red, your engine bay will be too hot to touch anything at all on or around the engine, like the intake. My temp got into the red once because I lost my belt, I literally couldn't keep my hand on my air lid for more than 1 second without burning my skin.


