Question about 2005 Nissan Altima

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Why does my nissan altima 2005 not blowing hot air unless it runs over 1500 RPM 3.5 lt motor rad is clean also heater core is clean if it runs done the rd at over 1500 RPM lots of heat

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Take it to a radiator specialist shop as it indicates that there is an air lock in the cooling system that needs to be removed so that full coolant flow can be achieved

Posted on Dec 30, 2016

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Posted on Jan 02, 2017

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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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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

1 Answer

2005 altima heater blows cold air


have you checked your fuses? thats the first place to start
if no fuse is blown a connection behind the dash may have come loose or the heater core burnt out
unless you like a challenge both are jobs best for a mechanic as it may be a rather lengthy process

Nov 09, 2010 | 2005 Nissan Altima

1 Answer

2005 nissan altima heater blows cold air when stopped and blows hot air when going down the highway. What could be the problem?


Check your coolant level. If it is low, what you describe will happen. Water pump works faster as rpm's increase, managing to get hot coolant to heater core (highway speeds). At idle, pump is not working fast enough to get the coolant to the heater core.

Feb 09, 2010 | 2005 Nissan Altima

1 Answer

2005 altima won't blow hot air until the vehicle is rolling. Once it comes to a stop it blows cold air until you move again.


Check the coolant level.If you are low it will stop flowing thru the heater core at low RPMs.

Jan 05, 2010 | 2005 Nissan Altima

3 Answers

Heater blows cold air at low speed and idle 02 nissan altima


I worked at a Nissan dealer for 18 months and we'd get a lot of these in. The cold heat at idle is accompanied by a sloshing noise from behind the dash - you've got an air pocket in the heater core. What we used to do was lift the front end of the car about 3 feet off the ground using the hoist and take the rad cap off. Then we'd run the engine at a fast idle (jam a screwdiver against the throttle stop to hold it fast or put a slight weight on the pedal if it's Electronic Throttle Body. Run the heater on full heat and the engine like this. You'll see the rad 'burping' as the air in the cooling system travelling to the highest point it can - the open rad cap. Top up with a 50/50 mix of coolant and water as you go. When it burps no more, you have a full cooling system and should not suffer any more "cold heat".

If you do this yourself, PLEASE use jack stands, block the back wheels and put the parking brake on!!!

answer from a Nissan mechanic, (not me)

Dec 10, 2009 | 2002 Nissan Altima

1 Answer

2003 Nissan altima blows hot air interminently.


check your radiator fluid, then if its low get a rad system pressure test done you may have a leak

Dec 06, 2009 | 2005 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

1 Answer

Heater blows cold air


With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.

May 18, 2017 | 2005 Lexus SC300

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