2002 Nissan Altima Logo
Posted on Feb 24, 2009
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Nissan Altima no cool air blowing or hot air blowing

The fan blows fine on heater/air conditioner. The problem is that its only blowing lukewarm air not hot and not cold. Its a Nissan Altima 96.

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  • Anonymous Mar 20, 2014

    When car is cranked

  • Anonymous Mar 20, 2014

    When car cranks

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2 Answers

Paul W

Paul W

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  • Posted on Feb 24, 2009
Paul W
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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.

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Paul 'W' U.K

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  • Posted on Apr 01, 2013
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My 2007 nissan altima was cooling fine until i switch for the winter to use the heaterand when i switch its not cooling

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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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