Question about 2004 Nissan Sentra

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Overheating my 2004 nissian sentra 1.8L is overheating and the water is not circulating from the top hose of radiator to the bottom hose of the radiator. I had the radiator, motor and heater core flushed and also had a new thermostat put in with no success.

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Then the water pump must be bad in it .Take the rad cap off and rev motor up if it goes down the the pump is working if it spays of look at the head gasket being damaged .Check and make sure spark plugs are not wet either if one is soaked signs of a leaky head gasket

Posted on Feb 21, 2009


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Components that fail and cause overheating on 2004 jeep liberty 3.7L 4x4

How many miles on system. One item that most people never check and it has burned up too many motors to mention is the bottom radiator hose. The hose gets soft with age and it will look normal when you are looking at it, but once the engine is warm and the motor starts running at a faster speed, the volume of water moving through the system creates a suction that collapses the lower radiator hose and the engine gets hot because there is not enough circulation. If you have higher miles or years and haven't changed the upper and lower radiator hose, do so any way.

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Why wouldn't water circulate through the radiator

You are spot on. Bad water pump. It is also probably the reason your timing belt was frayed. The water pumps of later model cars usually drip some through a "weep" hole in the bottom when they are going out as a kind of warning "Hey, you gotta get me a replacement soon!" But unless you live where no air conditioner is ever needed, or used, most people think it is the drippings from the AC. Get that pump replaced ASAP and when done, do a compression check on all your cylinders to make sure there was no head gasket damage from overheating. Good luck.

Apr 22, 2014 | Kia Sportage Cars & Trucks

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Your belt may be loose and not turning the water pump enough to circulate the coolant causing it to run hot,crank car up, have some one press gas pedal and watch belt turn,if not turning tightly,then belt or tensioner is bad.

Mar 25, 2014 | 2004 Nissan Sentra

3 Answers

My 2004 sentra is overheating the thermostat has been replaced the spark plugs have been replaced and i have flushed the radiator with no avail. my water pump is not leaking and seems to be running fine....

You need to check the fan on the radiator. Also check the nozzles for the input and output from the radiator. If the nozzle at the radiator inlet is not hot, then the problem is in the cooling system. If the nozzle from the radiator is hot, then the problem is in the radiator. Be careful not to burn yourself.

Sep 06, 2017 | 2004 Nissan Sentra

1 Answer

Car is overheating after the thermostat, flushed motor, changed oil and oil sending unit, and new fan fuse?

if it is not loosing coolant, then the coolant is not circulating. Moving the warm stuff to the radiator to cool and then cool stuff back into the engine is the way it is supposed to work. bad water pump or clogged radiator come to mind first. remove the engine ends of the two large hoses from the top and bottom of the radiator and dump water into the top hose, if it does not flow out the bottom hose at about the same rate, it may well be clogged.

Jul 21, 2011 | 2001 Saturn S-Series

1 Answer


Overheating can be caused by several things including low/no coolant, blocked/broken hose, faulty water pump, stuck thermostat. CHeck the coolant level in the over flow tank and in the radiator itself. If it's low you know you have a leak somewhere. If it's full you know the coolant isn't circulating through the system.

Let the car run until it heats up then feel the upper and lower hoses on the radiator, they should both be hot and firm when the coolant is circulating. If the top is hot and the bottom is cool and pliable then you know the coolant isn't going through. The most common cause of this is a thermostat that isn't opening. Look to make sure the water pump is operating properly, that's what circulates the water through the motor.

If you suspect a leak then you need to find where it's coming from. Check around the head/intake gaskets for signs of leakage as well as around the side tanks on the radiator and all hoses and connections.

Start with the small/obvious things first and progress from there. Good luck.

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Ford focus overheating

Water pump. No question in my mind, water pump.

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