2001 Nissan Sentra Logo
Anonymous Posted on Jan 04, 2010

Nissan Sentra 2001 - Overheating but no hot air

I had the water pump, thermostat and radiator replaced. Problem seemed to be with the water pump for the overheating issue but since the radiator was getting old and the thermostat was on the way to the water pump I had those replaced also.

Car doesn’t overheat anymore but still no hot air???

Not sure what the problem is anymore...

Can someone please help?

  • 6 more comments 
  • Anonymous Jan 05, 2010

    Thanks for the info.

    Are the water pipes in metal? One lager than the other? I had the car running until the temperature was just below half and both pipes were still cold. With that said what do you suggest I do? Can the cause still been air in the system?

    Thank you in advance...


  • Anonymous Jan 05, 2010

    Thanks for the info.

    Are the pipes you mentioned in metal and one bigger than the other? I let the car heat up?the temperature was just below half way and both pipes were still cold.

    What do you suggest I do? Is air in the system still a possible cause? If so what can I do to eliminate the air?


    Thank you in advance.

  • Anonymous Jan 05, 2010

    Sorry for the double comment initially my first comment didnt show up...

  • Anonymous Jan 05, 2010

    I just found out that the metal pipes are for the A/C, I check the rubber ones after work and post my resulats but if both rubber pipes are cold what are my potential next steps?

  • Anonymous Jan 06, 2010

    Hello Colin,

    Yesterday evening, I drove the car for about 30 minutes, still cold air but after I parked and started pushing on the gas I felt warmer air. I started driving the car and while I was pressing on the gas I was getting warm air but it would cool off when I take my foot of the gas pedal. Note that this is the first time I feel warm air in a couple of weeks.

    This morning I started the car and pushed on the gas pedal for a little while, after 3-4 minutes I got warm air again, after removing my foot off the gas pedal the air would cool off. This time it took only a couple of minutes for me to feel warm air?

    I checked the rubber pipes and noticed they were relatively warm considering temperature outside (-15 Celsius or 5 Fahrenheit).

    What?s your diagnosis?


    You mentioned that the thermostat might not be working properly but wouldn?t the car be overheating in that case? Is it possible to was installed upside down?

    Thanks again for everything,

    Cheers

  • Anonymous Jan 06, 2010

    One last thing, is it possible that I'm loosing pressure or have little pressure in the motor?

  • Anonymous Jan 06, 2010

    Great stuff, I'll keep you posted!

  • Anonymous Jan 13, 2010

    Cause, air in the cooling system. Removed, all is good. Colin, thanks for the great tips!

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  • Posted on Jan 04, 2010
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It could be just air in the system, or it could be the heater matrix just by your feet, fitted central dash, check to see if the two water pipes that go into the car from the engine compartment are hot if there is only one that is then thats your problem, but if they are both cold the problem is more to do with where the water is coming from, please let me know how you get on

Testimonial: "Great tips, pointed me in the right direction."

  • 3 more comments 
  • Anonymous Jan 05, 2010

    The next step to take if both rubber pipes are cold when your car is at correct operating temperature would be to find out why the water is not circulating properly, also dont forget just because you have replaced the thermostat, doesn't mean that one is not faulty also, just let me know my friend, Colin.

  • Anonymous Jan 06, 2010

    Regarding your question about the rubber pipes are warmer now, means that something is starting to happen, so i think just leave it for a couple of days just to see if the heat gets better, if it does leave it, but if nothing changes you may have an air bubble in the heater matrix which is inside the car, If nothing changes try to find the inlet hose and the outlet hose, Now what you need to do is to undo the clip that holds the outlet hose onto the pipe without the car running, take the outlet pipe off and then push it back on but not too much. Now the engine must be cold to do this as the water will be boiling hot otherwise, So from cold, start the engine and either watch the temp gauge, or when you feel the inlet pipe getting warm means the thermostat is starting to open, when that happens pull off the outlet pipe which hopefully will release the air and then push the pipe back on and tighten the clip. Then turn off the car and wait for it to cool a bit before removing radiator cap to top up fluid, Good luck, and let me know

  • Anonymous Jan 06, 2010

    The only way you would lose pressure is if either the water pump gasket was leaking or the head gasket was leaking, With a water pump gasket leak you would have water on the ground, but with a head gasket leak it could be internal or external, again a leak outside would be on the ground and inside a certain amount of water would come out of the exhaust pipe, but dont worry about that now, as you have a small amount of heat, just check for water leaks

  • Anonymous Jan 06, 2010

    Ok, i look forward to your next message, Just to give you an idea of what to expect when it all works properly is those two rubber pipes get so hot that you should not be able to touch them for more than a few seconds, Colin. England.

  • Anonymous Jan 13, 2010

    You are very welcome sir, and now very warm, great stuff, Colin.

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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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Fig. Exploded view of water pump and thermostat components-1.6L engine

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Fig. Exploded view of thermostat and components-1.8L engine


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Fig. Exploded view of thermostat and components-2.0L engine


Removal & Install
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