Question about 2002 Nissan Altima

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Have a 2002 altima 4dr 2.5 needs heater core best sight to check for a new one

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Posted on Mar 19, 2011

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2002 nissan altima heater problem


have 2002 altima,blower works no heat at idle and very little heat when accelerating.I changed carbon cabin filter,made sure little gear under dash to temp knob wasnt broken,flushed and bled system.Nothing worked so checked hoses to heater core and found inlet hose was hot,outlet hose was not.So investigated this problem and came to conclusion heater core was clogged.An easy way to check is to get car to normal running temp. put on heater and blowers at full.Go under dash on passenger side where counsel meets firewall,this is where heater core core inlet and outlet aluminum tubbing go through firewall,you will be able to feel both tubes one closest to you is outlet, so if this one is not hot and and other is your heater core is clogged.I detached both inlet and outlet hoses to heater core from water control valve.Then I blasted water with waterhose and nozzle set at jet,first through outlet hose to blow gunk out,then through inlet hose until water runs clear.Reatach hoses fill and bled system.heater works great nice and hot!

Nov 10, 2012 | 2002 Nissan Altima

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2002 Nissan Altima - the heater only works if I go over 35mph. It blows very cold air if I'm stopped at a stop sign or a light.


You could have a head gasket problem that will destroy your cat and 02 sensors. BUT without spending much cash reverse flush your heater core internally first. If this doesn't work I've seen little friends make nests inside the blower motor housing. Take out glove box then drop down blower housing. Vacuum and blow out housing and reach in and clean externally the heater core. Both jobs will take inexperienced folk 4 hours.If this doesn't fix the be prepared to open up your wallet.

Jan 07, 2011 | 2002 Nissan Altima

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I have a 2002 Nissan Altima. The heat no longer works, it blows out cold air. The heat will only slightly work when I drive on the highway.


Usually it's a bad thermostat or a blocked heater core. The best way to fix it is to have it flushed out. But make sure when it's done, either by you or your shop of choice, they disconnect all the hoses and do the heater core, motor and rad seperately. Also put in a new thermostat. Another problem in certain vehicles with low use is that the air direction flaps in the dash are stuck. Start the car, and move the dials. you should hear the flaps/doors moving. (They are vacuum controlled, so thats why you start the car). I hope this helps.

Dec 26, 2010 | 2002 Nissan Altima

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Nissan tech said i needed a new heater as all i got was luke warm air at best, i had a different mechanic put in a used heater core unit and the same thing is ocurring. it is like there is no flow thru...


The hot air for the heater is derived from the engine coolant temperature. I would check to see if your thermostat is stuck open. Please rate me on this answer.

Jun 10, 2010 | 2002 Nissan Altima

1 Answer

HEATER


Check the coolant level.Feel the heater hoses going to the heater core to see if they are warm,or hot.If one of them is warm,or hot,and the other is not,remove the heater hoses,and flush the heater core out with a water hose.Bleed the coolant system,and you might want to install a new thermostat while you are at it.

Dec 10, 2009 | 2002 Ford Taurus

1 Answer

I have no heat have flushed heater core and replaced thermostats


Check the valve that changes the water flow into the heater core,free it up if it's not moveing.Run the car to normal temp then shut it down.Check and confirm that the upper and lower heater core hoses are both warm.

Dec 08, 2009 | 2002 Nissan Altima

1 Answer

My 2002 nissa altima has no heat in park or when stopped although while driving from a long distance it gives out warm air


Check coolant level, make sure it's at the proper fill mark when cold.
Partially blocked heater core - back flush cooling system
Defective heat control valve.
Hope this helps.

Nov 09, 2009 | 2002 Nissan Altima

2 Answers

Heater works sometimes no leaks engine temp normal


Considering that your vehicle is only 7 years old we can rule out any clogging in the heater core. I would suggest having the heater control vavle which cuts into your heater hose in the engine compartment check or replaced. This controls the volume of coolant flowing through the heater core. Thank you, Dana

Oct 18, 2009 | 2002 Nissan Altima

1 Answer

Very little heat in cabin of car


Trash build up gets caught in the heater core usually because coolant flush isnt done oncea year. What needs to be done is disconnet heater hoses and blow heatercore out with shop air.

Jan 11, 2009 | 2002 Nissan Altima

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