Hi, people, i have the 2004 g35 with 100000 miles. Recently it gets overheat whenever i turn on the a/c no matter i drive in traffic, local or highway.

I get confused if the car in traffic or local and it gets overheat when the a/c is on, that would be caused by the fan. but my car get overheat in highway( i drove 60mph) when the ac is on. when the a/c is off, the needle in tempe gauge goes back to the midd-line. the temperature here in new york is 83F

the two fans seem run very normally

any idea? thermostat ? or the water pump ?

 

When was the last time you flushed the coolant? Also, do you know the condition of your radiator?

 

radiator seems ok, the last time i flushed the coolant is 3 yrs ago

 

^^ Time for another flush.

Does the car overheat when just sitting? I would let the car sit in the driveway and run it until the fans come on. Obvious places to look you already stated but your radiator could be going.

 

Does the electric fan kick in at all?

 

It could be your thermostat or the fans for the radiator. I would make sure both fans turn on when the AC is on and both of them are free and not binding or have any heavy resistance. The warranty was extended for Coupes but it could also be something that affects you.

https://g35driver.com/forums/5867679-post18.html

https://g35driver.com/forums/engine-...g-issue-2.html

 

i turned on the a/c and let the car stop at my driveway, both fans run very strongly. my car get overheat again even in highway when the ac is on, i am going to replace the themostart, should i use the oem or other party , thank you

 

You will be fine with a Nissan thermostat.

 

i just flush the coolant and replace the thermostart, but the problem is still there. when the tempe goes up i mean the needle at "H", the engine has a higher rpm, then i heard a "click" sound from the hood, and then the tempe dropes back to the normal, just wonder is it something wrong with ECT sensor or other senosr? or even the water pump

thank you

 

Did you burp the coolant?