Question about 2002 Nissan Altima

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Very cold air blows when heater is on

Also electric radiator fan runs intermittantly, replaced thermostats in block and head, problem not resolved

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  • Anonymous Nov 22, 2008

    my nissan altima blows cold air when the heater is on if the car is idling or stopping at red light.

  • Anonymous Nov 24, 2008

    MY HEATER BLOWS COLD AIR WHEN IDLING AND HOT WHEN MOVING AT HIGH SPEEDS..HOW DO I FIX THIS?

  • Anonymous Nov 30, 2008

    Heats on....warm air comes out...no heat though???

  • julsall Dec 06, 2008

    My Nissan Altima loses or no heat when idlding and when at a stop . Will blow hot air when driving .

  • Anonymous Dec 31, 2008

    My 02 Altima blows cold air when idling or at low speed.  Will warm up on the highway

  • 7nephews Jan 19, 2009

    My heater does the same thing...cold when stopped at lights or drive thrus and only hot when on the highway

  • paulatracy Jan 26, 2009

    I have a 2005 Altima that also only blows warm/hot air when the vehicle is in motion. When the car is idling at a light, for example, the temperature drps to a very cool temperature. This started about a month ago and I haven't attempted repair yet since I live in a warm state. Any repair suggestions would be great.

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An electic radiator fan only comes on when its needed. you may have an air lock in the heater box. if this helps please rate

Posted on Nov 22, 2008

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Why does my 2003 chevy venture over heat after ten minutes of driving from a cold start?


The first thing I would verify is that there are no air pockets in the cooling system. It can look full but actually have air in the system from being drained.
The next thing would be circulation thru the radiator. Then a blockage in the radiator hose or the block.

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Over heating and blowing cold air from heater


Possibly leaking head gasket. Easiest way to check would be to fill radiator full, start engine and watch coolant level in the radiator cap opening. The top radiator hose will become hot when thermostat begins to allow coolant flow through the radiator. You may have to top off the coolant. Still with the radiator cap off watch for water belching out of the radiator neck. If coolant does belch out of the radiator cap neck, refill with water. If it belches out coolant again it would be combustion gassed forcing the coolant out of the radiator.


This process should take about 1/2 hour to diagnose if it is a head gasket leaking combustion gasses into the coolant.


The radiator fan may run once car is shut off to cool engine compartment to prevent gasoline in fuel lines from vaporizing which would cause a condition called "vapor lock". A car won't start if fuel lines are vapor locked.

Good luck, I hope this helps you to figure out the problem.

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Try removing the thermostat and reverse flushing the motor, Actually try flushing in both directions, this will tell you if you have a circulation problem but 1 thing you should know is that the water goes in the water pump and out the thermostat, try running it without the thermostat and check your water flow

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My Buick skylark doesn't leak but it over heats..


To troubleshoot this types of problem,click the link below :---

All types of car overheating problems and troubleshooting? http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html

--------

heater blows through defrost?

-http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.

------
Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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This will help.Thanks.

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My 2002 buick century is loosing coolant fast. When car isn't running around 60-70 mph is seems to heat up more than normal and no heat or ac will occur. Should I replace the thermostat? I noticed the fan...


it sounds like one of several problems radiator needs flushed , water pump is bad or going, thermostat is bad, pin hole in one of the hoses, cracked head, hole in radiator, hole in heater core.if core is leaking you will notice water on the floor inside the car on pasenger side. if radiator has hole when you fill radiator with coolant it will leak froom fins sometimes only when hot. thermostat bad your car will read hot and or cold always. if stuck open cold, if stuck closed hot, after about 15 20 mins of running engine will cause radiator to boil over to over flow tank.never open radiator cap when engine is hot :) burn hazard.if pump is bad or going will notice gauge reads hot intermittent or always. will boil in to overflow tank. if head is cracked will notice water comming from side of engine block or in oil when you change oil. if radiator needs to be flushed will notice scale or gunk on radiator cap
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1 Answer

My 2001 lincoin ls gauge goes up to the h and then come back down


you probably have air trapped in the system. Have dealer or radiator shop bleed system.

I assume your cooling fan is working.

what engine v6 or v8?

SECTION 303-03: Engine Cooling 2001 Lincoln LS Workshop Manual
DESCRIPTION AND OPERATION Engine Cooling The cooling system components include the:
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  • radiator
  • pressure relief cap
  • degas bottle
  • radiator draincock
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  • water thermostat
The water thermostat:
  • controls the engine coolant temperature.
  • allows quicker engine warm-up.
The degas bottle:
  • provides a location for system fill.
  • contains coolant expansion and system pressurization.
  • provides air separation during operation.
  • replenishes the engine coolant to the system.
The fan blade draws air through the radiator to help cool the engine coolant.
The fan motor:
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  • will not operate when the engine is off.
The engine coolant flows:
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  • from the water pump to the engine block and the cylinder heads.
A closed water thermostat returns the engine coolant to the water pump. An open water thermostat allows the engine coolant to flow to the radiator.
Unsatisfactory coolant materials:
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    • reduced antifreeze protection
  • Alkaline brine solutions will cause serious engine cooling system damage.
The cylinder head temperature sensor provides a signal to the temperature gauge.
  • will invoke failsafe cooling.
The optional block heater:
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  • keeps the engine coolant warm during cold weather.
The auxiliary water pump (3.9L only):
  • provides heater coolant flow boost.
  • has a secondary function of providing engine-off cooling.

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1 Answer

Engine overheats when heater pipes connected


I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

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1 Answer

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