Question about 2005 Nissan Altima

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No heat when engine is at low rpm or idle.

I have a 2005 Nissan Altima 4 cyl. I can only get heat when driving down the road or revving the engine greater than 2,000 rpm or so. The engine coolant gauge is in the normal range. I have replaced both thermostats with the exact same results. Please offer any advice.

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  • sashus Nov 23, 2008

    I have the same problem - 05 Altima 2.5- 47k miles

  • MrLogic Dec 08, 2008

    I too also have this problem. I also removed the radiator cap even though pressure was building up it did not appear fluid was being circulated.

  • jlp5656 Dec 17, 2008

    same thing 2005 Altima with 43K and future daughterinlaws mothers car 2003 altima same thing both are the 2.5 Ltr.

  • markthecat88 Jan 01, 2009

    i have a 2005 nissan with only 28k miles same problem i took it to a dealership they said it was an air pocket in the radiator they so called fixed it next day same problem



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Same problem with my 2005 Altima V6, with only 44k miles on it!!! and this is the second winter in the last 4 years that I have to pay for a coolant flush to fix the problem. This time the thermostat is getting replaced too. Time for a new car!

Posted on Dec 02, 2009

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If engine temp. is good. i would rec. good flush of the heater core disconnect both heater hoses and flush core in both directions. (pressure washer works good)

Posted on Nov 23, 2008

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The problem is traped air in your cooling system that wont let the heated coolant pass thru the heater core at idle it will bypass it. when you get in the gas going down the road it will go pass the air into the heater core when you let off the gas the air keeps it from passing through the core it will bypass the core and still cool engine so if no coolant going through the core no heat. the fix you can raise the front of the car on a set of car ramps remove coolant cap and try to let the air move out of the coolant this takes time. or your dealer can pull a vacum on your cooling system and remove the air . trust me this is your trouble . i hope this helps seems to be alot of people with the same trouble . remember remove the air

Posted on Jan 08, 2013

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These cars are very sensitive to incorrect antifreeze mixtures. If you have too much coolant and not enough water the heater performance will suffer. Make sure there is a least a 50/50 coolant water ratio.

Posted on Nov 26, 2008

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1 Answer

2005 nissan altima getting hot after new radiator

There could be a whole lot of reasons.
Here are some, not in order of "what is most likely".
1) Your electrical "cooling-fan" circuit could be at fault.
This is the circuit that includes the radiator cooling fan, the engine block sensor, the electrical relay, and the wiring.
Any fault here will cause overheating.
2) Your water pump or drive belt could be at fault.
3) Your engine could have an air bubble that need to be cleared.
4) Although quite rare, check to be sure the lower radiator hose in not collapsing when the engine is revved ( such as when going down the road at 40-70 MPH)
Test bt feeling of it to be sure it is not "soft".
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