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Posted on Dec 10, 2009
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Heater blows cold air at low speed and idle 02 nissan altima

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  • Posted on Dec 31, 2009
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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)

  • Anonymous Feb 17, 2013

    Thank you so much my daughters 2006 Altima has been doing this we put in a new thermostat and emtied and refilled the coolant system 3 times with no luck. Im going to have my mechanic do just what you said. Thank you so much.

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  • Posted on Dec 13, 2009
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I had the same thing happen last winter and it was just the radiator cap(thats it) This happened on my 2003 Nissan Altima 3.5 Just topped up antifreeze and changed cap and it solved the problem.

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  • Posted on Dec 10, 2009
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Your car overheats check the antifreeze

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0helpful
2answers

2002 Nissan Altima Cold air blows at idle but is warm at higher engine RPM
Heater core may be clogged. Try flushing it to see if water flows through freely. Also check the heater water control valve for restrictions.
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Dec 15, 2017 • 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.
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Jan 07, 2011 • 2002 Nissan Altima
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Heater only blows cold air when idleing but blows hot air when driving at highway speeds. coolant level is fine.
you have air trapped in cooling system. Go to a shop that uses evacuate & fill equipment and have them flush system and burp air. SHould cost about $65. Make sure they have evac/fill equipment
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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.
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Feb 09, 2010 • 2005 Nissan Altima
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Jan 05, 2010 • 2005 Nissan Altima
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Nissan Altima 02. heater problems
Have you tried asking them to just flush the system, as well as reverse flush? Sometimes that will clean it out enough to get you where it needs to be for now. If not, I'd try that, at another shop, obviously, if for no other reason, a second opinion. Try one that specializes in radiators if there is one in your area. If no luck, and your handy at all, I can tell you what I did to clean core out a few times that worked pretty well for me, and only cost me about $20-$30, and a little time. Let me know if your up to it, but I'd gamble the cost of a flush, and my method, before I'd pay $100's of dollars for new core.
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Dec 22, 2009 • 2002 Nissan Altima
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2002 Nissan Altima blowing cold air,coolant level was low, but coolant was added and it's still blowing cold. A compression check done two weeks ago and shop found no leaks, but the coolant in resourvior...
You could possibly have air trapped in the heater core. The easiest way to bleed it out is to jack up the front of the car till the radiator fill cap is higher than the upper heater hose using a funnel that fits snuggly in the filler neck of the radiator, fill till you have about three inches of coolant/antifreeze above the filler neckthen run the car at about 1500rpms until no more bubbles are evident. Also turn the heater onto face on low speed and feel if heat starts comming out.
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Dec 06, 2009 • Nissan Altima Cars & Trucks
19helpful
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Nissan Altima no cool air blowing or hot air blowing
Hi!
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.

Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K
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Feb 24, 2009 • 2002 Nissan Altima
1helpful
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2003 nissan altima heater blowing cold air
Replace your thermostat
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Jan 23, 2009 • 1995 Nissan Altima
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Heater bows cold when idling
Hya!
You need to bleed the cooling system.
To do this park on level ground, when cold remove coolant filler cap, start engine and leave to idle.
Have plenty of warm/hot water available, when engine reaches operating temp it may appear to boil over so keep away from coolant filler, top up with warm/hot water and wait as it may bubble over a few times before settling.
Replace cap and hopefully back to normal, Remember your Anti Freeze?
Good luck,
Paul 'W'
Oner~EDson(:0) {#><U.K.
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Jan 16, 2009 • 1995 Nissan Altima
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