Question about 2001 Nissan Sentra

2 Answers

Engine overheat and no heat

Got a pre-owned nissan sentra 2001 gxe. Everything works but Heat. Engine was getting overheated ,2 miles driving can make the temp to H. checked upper hose was hot and lower was cold. took it to the mechanic thermostat changed. Heater and radiator worked for 10 min GOOD and still the same no heat and engine over heating. Took the car to mech now he changed water pump. car ran for 20 min GOOD and again no heat ,upper hose hot and lower hose cold, funny thing is that ,that the temp is fluctuating very easily . highway driving brings temp sometime down and any lower speed brings temp to H. noticed all time fan worked at high temp. so conclusively ,coolant full, fan works,upper hose is hot and lower hose is cold, no heating in the car, temp is fluctuating crazily ,water pump new, new thermostat installed, NOW WHAT COULD BE A PROBLEM??? ANY EXPERTISE OR HELP/ SUGGESTION/ ADVISE!!!!!

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  • zesty Nov 08, 2012

    Thank you guyz for your sincere advise and input. Today car was back to mechanic and as you have just suggested , mechanic bleet the heater hose.. ran the car with the funnel opened and coolant for 1 hr. Car was in his garage and ran smoothly with the heater on and temperature was in control. I also thought to replace Radiator Cap and I did. After all I took out the car for a drive and merely 2 miles and * I found Heater stopped working and temperature gauge was again toching H .One thing I did notice ,was when the car was cold and i turned on the key,on pressing accelerator i did hear some water or coolant sound from inside of the car and heater was on and so was the temp controlled. As the sound of the moving liquid was gone , no heat and Hight Temp.. Now what do you guyz think what the problem is....I am getting fed up with this issue.. already spent three days.. and not figuring out to the problem..please suggest any one...

  • zesty Nov 08, 2012

    The sound of the liquid you can hear specially if you bring up rpm 2000+ and heat is really good but as you loose it and start driving ,, you tend to loose heat and temp+++. Just added this comment. Again- radiator cap + thermostat + Water pump + antifreez all have changed, fan works fine.. Plz suggest , all suggestions are appreciated...

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2 Answers

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  • Nissan Master
  • 2,029 Answers

Radiator is clogged or the heater core is blocked up. Stop running it hot or you are going to blow the motor. Get it fixed and change the oil.

Posted on Mar 12, 2017

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  • Nissan Master
  • 14,337 Answers

Maybe your radiator is clogged.

Posted on Mar 12, 2017

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2004 NISSAN ALTIMA 2.5 NO CABIN HEAT..ENGINE AT OPERATING TEMP.

If the engine is not over heating than most lilely it isn't the thermostat or waterpump that is causing the problem. Check the heater hose coming out of the manifold and see if it is warm to hot. Next check the return line from the heater if it is still cold or moch cooler than the inlet, the most possible problem is the heater water control valve if this model has one or possible the core of the heater is plugg with slime cause by some antifreezes setting during the summer months while not being used. If this is the case than remove tihe two hoses and back flush the heater core with water pressure until it runs clear. I have had this problem before and this cured my problem. I also had to flush the engine and radatior also. Hope this help. .

Posted on Mar 14, 2009

  • 1 Answer

SOURCE: 2003 Nissan Sentra Problem overheating and heater doesn't work.

I had this exact problem a few weeks ago. The repair shop first changed the thermostat. Didn't fix the problem. Next step, they found the radiator was clogged. They replaced the radiator and now everything works fine.

Posted on Mar 23, 2009

  • 77 Answers

SOURCE: Hello, I own a 2000

Sounds like a blown head gasket from multiple overheatings. Parts retailers have a chemical that can determine this. To use it the coolant level in the radiator needs to be a little low so no coolant will be pulled into chemical container. Engine needs to be at operating temperature. The containter is pushed onto radiator cap opening and bulb squeezed numerours times for about 2 minutes. If the chemical changes from blue to yellow (or green depending on manufacturer) then the head gasket is blown or head has warped (or both).

Posted on May 03, 2009

alicantecoli
  • 22156 Answers

SOURCE: 2003 nissan sentra gxe 1.8

only one thing will cause this problem and thats the head gasket ,its pressurising ,no heat either as water is being blown out ,sorry to give the bad news

Posted on Dec 12, 2010

gordanddar
  • 477 Answers

SOURCE: 2004 nissaan xterra v6 3.3L

Well , I know $800 is a big bill , but think of it this way , you got a bunch of new stuff on the car. The timing belt replacement alone would cost someone almost $800 to have done by a mechanic , and if it broke and destroyed your engine how much would that have cost. It's always nice to solve the problem on the first try , but at least it is fixed now , and you won't have to worry about any of that other stuff for a long time.

Posted on Dec 15, 2010

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1 Answer

Will an air pocket in the coolant system cause it to overheat or over pressurize on a 2001 Nissan Sentra ?


1. The radiator cap if working correctly it will release pressure in the system provided the cap you have is the correct pressure setting. If you are having a problem with pressure then replace the cap with a new radiator cap with the correct pressure setting. Do not use a cap with a pressure setting other than the original equipment pressure spec. So you do not go to the parts store and buy any radiator cap on the shelf that fits because they come with different pressure ratings and some of these will be totally unsuitable for your car.

2. If the pressure valve is stuck in the "old" cap the pressure release system will not work.

3. Overheating
Air pockets in the cooling system can definitely cause overheating and can retard coolant flow through the system. If you are draining the radiator to replace the coolant or replacing the radiator you need to follow the correct procedures for bleeding air out of the system for that particular engine after coolant refilling. Some engines have bleeder screws on the cooling system to assist in the air bleeding procedure and some don't.

There are various causes for overheating so don't assume it will necessarily be solved by bleeding any remaining air from the cooling system and replacing the radiator cap with one that works.

Other causes can be...........
1. Faulty cooling system thermostat. (Replace the Thermostat)
2. Faulty water pump, especially if the impellers have corroded away or have disintegrated in the case of those design genius water pumps with plastic impellers. (Replace the water pump)

3. Cooling fans not working and if so the cause needs to be tracked. Check that your fans are kicking in. If the engine is overheating the fans should be running because they will switch on when the coolant reaches a specific temp and well before the coolant gets excessively hot.

4. A partial blockage in the coolant passages inside the engine but not in the radiator if you have a new one. If the coolant is not changed at the required intervals(frequently the case with many owners) or is over diluted with water you can get a build up of debris. If products like stop leak have been used in the system this can create similar problems with partial blockages inside the engine coolant passages.

5. A compression leak into the cooling system.
If you have bled air from the system and have continuous air bubbles in the cooling system I would suspect a compression leak. In that event a basic leak down test will show if you have compression gasses leaking into the cooling system and from which cylinder(s). The spark plug is removed and compressed air is forced into the cylinder via the spark plug fitting and air bubbles will show up in the coolant of there is a leak into the cooling system.
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Have the problem with overheating addressed immediately. Running the engine with an overheat condition will cause expensive engine damage many times the cost of fixing the overheating issue.

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Dec 29, 2015 | Nissan Cars & Trucks

1 Answer

I have a 2001 nissan sentra 1.8 with 158,000 miles. Problem started a month ago,no heat while idling but when revved up or driving would have heat. Changed thermostat,bled system from bolt above thermostat...


unfortunately these engines are known for this condition and for head gasket failure.with engine cold pressurize cooling system with spark plugs removed.look down into holes with flashlight after about ten minutes.....im betting youll see a puddle of coolant on piston...usually its cyl# 2 or 3.i cant think of any other possibility for system repeatedly airlocking other than a head gasket.good news they are probably one of the easier ones to replace.

Mar 10, 2011 | 2001 Nissan Sentra

2 Answers

2001 sentra no communication with scan tool


Take a few minutes to make sure you dont have a blown fuse....Run through them with your test light...

Nov 17, 2009 | 2001 Nissan Sentra

1 Answer

Nissan Sentra 2001 gxe with code p0420


You will need a new catalytic convertor assembly. Yours is below treshold efficiency in other words its "no good".If you have it replaced, ask the garage/dealer to give you the old one back. Its worth some cash if its full. It doesn't matter thet it failed. They are going after the mesh inside of it and that is worth some $$$$. May not be much , but better than nothing.

Jul 08, 2009 | 2001 Nissan Sentra

1 Answer

1990 nissan sentra overheating


it sounds like a water pump not circulating antifreeze properly

Dec 10, 2008 | 1990 Nissan Sentra

2 Answers

Heater blowing cold air


My 05 sentra with 79k miles heat will warm up and then get cold after a mile of driving, we have tried to get the air pocket out, the mechanic stated he thought it could be a blown head gasket, another mechanic said it was a bad heater core. Any advice would be appreciated.

Nov 24, 2008 | 2005 Nissan Sentra

4 Answers

2003 Nissan Sentra Problem overheating and heater doesn't work.


does the car overheat at idle or travelling down the road? if the thermostat was not changed, thats first step. checking it is replacing it. possibly air-bound. then i would suspect a headgasket problem.

Sep 30, 2008 | 2003 Nissan Sentra

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