Car overheated on me when I turned on the AC unit. After turning the car off the antifreeze started gushing from underneath the car. Meanwhile when the car is running, I do not see anything dripping out. Any idea what it can be?
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Change the thermostat it is probably stuck open or removed. Fan not working is a problem with overheating. It should come on when A/C is turned on. There will be fuses to check under the hood on the right side. . Also there are 2 fan relays. The larger of the terminals can be jumped to force the fan on. in the same place. I sometimes switch places with the relays to verify if they are bad.
You possibly have antifreeze in your engine where it dont belong, like the exhaust manifold if it was coming out of your exhaust. One reason it wont start is that either the head gasket went out and anitfreeze is leaking in that way or the manifold gasket is out and its getting in the combustion chambers to the pistons.
Pull the plugs out and then crank the engine over if water comes out of the plug holes you have a busted head gasket which would give you compression in the coolant system thusblowing out antifreeze as well as overheating.
Sounds like a bad water pump or radiator. Make sure the radiator fins arent clogged or inside of radiator, water pump not circulating the coolant properly will also cause overheating, old coolant will not properly dissipate heat efficiently and may need flushed. Also make sure the coolant has a 50% mix of water as the water does most of the cooling not the antifreeze. Hope this gives you some good places to start.
Your radiator could be clogged or your thermostat is not opening, take your car to a radiator shop to have it looked at. Do not overheat and drive your Honda, Japanese cars, once they are overheated, their head gaskets are prone to blowing which are very expensive to replace.
most likely when you replaced coolant line and refilled rad the system was not bled properly.
fill the system with 50/50 again and top up the reservoir. run the engine to 2000 rpm and look at temp gauge . it should rise to middle and drop to low this means t stat opend and air is out now let engine idle and top up coolant. good luck
One of the common things that gets missed at times is the radiator is down in cooling antifreeze. The car will act as normal during the warm up cycle and then the temperature guage will rise and then it will slowly come back down as the thermostat opens and/or the electric cooling fans come on. In actuality the engine is overheating, but it is not boiling over. The level of abtifreeze is at just the right level of lowness that you experience this phenomenon. After the engine cools off , (DO NOT REMOVE WHEN HOT - YOU CAN GET SCALDED WITH BOILING WATER/ANTIFREEZE)), remove the radiator cap and check the level within the radiator and also the antifreeze reservoir level. You can buy a 50-50 mix of antifreeze and water that is ready to put into the radiator. If the level in both the radiator and reservoir are correct, you may have a bad thermostat or some other problem.
Bob - 2003 Nissan Sentra SE-R SPEC V