It's probably the metal "T" fitting where the heater hoses are connected. I had to replace the fitting with a plastic one after the original metal one started to corrode. It would leak tiny streams of water when the temperature reached a normal level. The fitting is under the hood near the steering column.
are the cooling fans coming on
Is your fan coming on?
person coming from behind
Check the thermostat, it may be stuck in place.
your car is broken
Probably a faulty sender unit
probably a bad water pump................
It MAY help with the overheating problem....but you really need to find out why it's overheating. Blown head gasket, stuck thermostat, bad water pump, fan not coming on, etc.
Overheating or coolant leak.
Look at your thermometer. Or you can check for steam or smoke coming from the engine. Look and see how much coolant you have. And basically you can tell if it is overheating just by putting your hand by the engine after you drive it for a while. if it is abnormally hot, pretty good chance it is overheating.
I suggest you take your car to the dealer and they might be able to fix the problem.
No heat coming from the heater and the car overheating is usually the thermostat stuck closed. The thermostat is supposed to open up at a certain temperature allowing the engine to warm up quickly.