Once everything is working correctly remember to fill the cooling system with 50% distilled water / 50% anti-freeze solution. Some cars today do not have any way to regulate the water going through the heater core (flows freely) but if your car has one of these valves it could be bad (frozen shut). When was the water pump changed on the car? One other thing that is critical is the possibility of a regulator valve inside the car connected to the temperature setting on the dash. When you pull off the heater hoses take out the thermostat again and put the garden hose in the engine block to get water flowing through the entire system (all drains and hoses are off to allow the most flow). It sounds to me like you may have some sort of blockage in your cooling system. How much water comes out from the other hose (be careful it could be hot)? I have even blown air through one of these hoses to get any water out of the heater core. Do not turn the water on full blast you may have a leak in the car and I don\'t want you to have a flood. Turn on your garden hose and place it over one of those heater hose openings. ![]() Pull off the hoses that go from the engine block to the firewall (heater hoses). If the thermostat on your Sentra has failed, it may be stuck in the open. The thermostat opens and closes at specific temperatures to regulate the coolant temperature and allow the engine to reach its optimal temperature for performance. If there is no change then let it cool off for about an hour (engine cool to the touch) and drain the system again. The thermostat on your Nissan Sentra controls the flow of coolant between the engine and the radiator. Any heat on the inside? Turn the car off and let it cool again for about thirty minutes. Any better? Wait for the temperature gauge to hit the middle point between hot and cold (normal running position). Let the car run, watch the temperature gauge, keeping filling the radiator, check for heat inside. The car must be running as you add the cold water to a slightly hot engine to keep the engine block from cracking. Now start the car and add water to the radiator and start the process all over again. Notice any sludge coming out in the water? Close off all the drain cocks. Drain the water out of the radiator (you can remove the lower radiator hose if necessary) and engine block. ![]() Now does the temperature gauge on the dash reach the middle setting? Any heat coming from inside the car? Listen to the engine do you hear any noise from the belt side? Possibly a bad water pump? Turn the car off and let it cool down for about thirty minutes. Leave the radiator cap off when you do this since the fluid level will go down as the car warms up. ![]() Turn the temperature setting to full hot and run the car. The first thing I would do is drain all of the fluid from the cooling system (check to see if there is an engine block drain and open that too) and replace it with water.
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