Question about 2004 Infiniti G35 Sport Coupe

3 Answers

No heat when idle

My g35 2004 has progressively gotten colder and colder. Last winter it seemed that the heat hardly came on when idling in the driveway and it took forever to defrost the windsheild. This year the heat will not come on when idling at all. No defrost, can't drive in the morning with frosty windsheild. Some one said it might be the water pump, changing out the water pump is a big job for just a guess....any ideas?

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  • travellynne Dec 05, 2008

    The heater box was flushed.

  • lotuni Dec 21, 2008

    Same problem for me. at idle it blows cold air but if you even rev it to 1500 rpm then you can feel the heat start to blow. As the original poster states this takes forever to defrost and is almost unbearable in stop and go traffic. The car never heats up.


    I've taken it to infiniti and they claimed it was the radiator cap that did not have a proper seal.....  yea whatever...


    Anyone know what the real issue is?

  • Anonymous Jan 14, 2009

    I have an m35 X 2006, at first I had no heat at idle. Dealer added antifreeze and bleed air from system. Heat at idle improved but still warmed up considerably when rpms were brought up to around 2500. Took car back under warranty still, Dealer replaced radiator, flushed system and bleed air from system. Car still has problem of much less heat at idle, especially at driver's feet, when rpms are brought up heat increases, however the only way to get decent heat at driver's feet is to set dual control to low temperature on passenger's side and at 90 on driver's side feet only. Am taking car in tomorrow for another attempt to fix problem.

  • greaserack Mar 01, 2009

    No heat, no defrost until maybe an hour after starting the car. Is there a flapper valve that opens to allow heat form the heater core? Is it vacuum operated?

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Might be an airlock in the heater box. joe

Posted on Dec 05, 2008

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Im having the same dam problem its tooo cold for this as much as this dam car cost you shouldnt have no problems

Posted on Dec 30, 2009

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Yes but it coild be still be airlocked. and probably even more so that it was flushed

Posted on Dec 06, 2008

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