Question about 2001 Nissan Sentra

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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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  • Nissan Master
  • 2,899 Answers

Try this procedure:

  • The thermostat can be stuck close. If you feel the upper hose very hot and the lower hose cooler than normal, it may be a stuck thermostat.

  • Make sure the radiator and the overflow bottle are filled to the proper levels.

  • Bleed air from the coolant system:This is best done by running the engine with the radiator cap off until you see when the air bubbles stop coming up.

  • Check the radiator fans: The easiest way is to turn on the cars air conditioner and turn up the A/C fans. Both radiator fans should come on when the A/C starts

  • Make a pressure test by using a pressure testing tool (available at most auto parts stores). Use the pressure shown on your radiator cap. Most cars are 16 PSI or less, so don't exceed that pressure. Replace the radiator cap if it doesn't hold the pressure.

Posted on Apr 25, 2015

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  • Master
  • 978 Answers

You could have an air lock would bleed heater hoses

Posted on Nov 07, 2012

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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
  • 22095 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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