Question about 2002 Nissan Altima

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

THERMOSTAT GOOD COOLANT LEVEL GOOD..HOSES INTO HEATER CORE COLD

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  • dschind Feb 01, 2009

    No heat and no cooliant

  • Anonymous Mar 15, 2009

    Losing 1 quart of oil every 800-1000 miles. I have heat & cooliant, but theres no oil spots on the ground. Nissan is doing an oil check and watching my mileage. Not sure what's next

  • Anonymous Mar 19, 2009

    02 nissian altima 2.5 replaced thermostat, and water control valve flushed heater core motor and radiator , still have heat while driving and sometimes when sitting crazy. Thinking heater control valve or heater core or radiator cap its only 6.00 it is the cheapest this first if you have had this problem and fixed it let us in ou it also did compression all 180-185 Ithink I dont have the answer yet but working on it thanks and GOD bless .

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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

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Water pump is bad.....or thermostat is not opening....

Posted on Jan 14, 2009

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When you let coolant out of system the level dropped below heads . this caused an air bubble in heads and or motor. when you go down the road the extra pressure of the water pump takes up the slack but at idle you are dealing with an air bubble that does not transfer heat

Posted on Jul 03, 2009

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Posted on Jan 02, 2017

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2) Cooling fan/s are running normally as they should when coolant temp rises,
3) A coolant hose on the suction side of the water pump is not collapsing (due softening) causing restricted coolant flow,
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2 Answers

Heater temperature does not stay hot


1st thing to check is the coolant level. I've seen cars w/ no heat, or very little quite a few times caused by low level in cooling system--not low enough to overheat the engine, but enough that circulation of coolant to heater core is affected (no or little hot coolant circulation to heater core=no or little heat),
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Here's how the system works: the heater 'box' contains a heater core (a mini radiator) w/ a fan and hoses connecting the heater core to the engine cooling system. Hot engine coolant is circulated thru the heater core. When u activate the heat switch on the dash, a flap door opens to expose the heater box to the passenger compartment. The fan switch on the dash activates the fan, which blows air thru the core, which heats the air.
So, if it's not the coolant level at the radiator, the fan is obviously working, the engine is reaching operating temperature, I would say it must be the flap door that opens, isn't opening fully, or isn't staying open. It could be the dash switch is defective (not supplying current to open flap door) or less likely the flap door is binding somehow. Hope it's as simple as correcting coolant level, if not, the dash switch control should be checked

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