G35 overheating only with AC on

Yea only one of my fans come on the other one never comes on no matter what. Overheating, AC on, etc etc it never turn on.

does that mean the fan is shot? Should I order a new one
 
Weird. When I start the car, no fans turn on. Even after 2 minutes. When I turn the AC on, both fans come on.
 
Fire0nic3FX said:
Yea only one of my fans come on the other one never comes on no matter what. Overheating, AC on, etc etc it never turn on.

does that mean the fan is shot? Should I order a new one
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Stop trying to throw parts at it. Test the parts first. Its not very hard to do. Like I explained. Apply 12v to the fan plug to see if it works. (If u can't do this, it would be overall cheaper to pay a shop to fix your problem). If the fan turns on and spins nicely your fan is good and now look for what sends the signal, fan relay, fan control module or coolant temp sensors are simple items to test. Wiring diagrams help big time via the FSM.


You could replace the t-stat. If your that bothered about bleeding the coolant then let someone do it. I've done it once on a g coupé. It took a longer time then I'm used to but no air pockets with the rear bleeder screw loosened and careful pouring.
 
if you think the termostat is the problem, raise the temp no normal operating temp. then feel the radiator hose. lower should be colder than the top. then rev the engine up 3000rpm about 3 mins. then feel the lower hose if any changes in temp(if there is changes then you termostat is working properly). at this point your radiator fan should kick in. do this while the AC is OFF. you need to find this problem quickly, i've seem coolant mix-up with transmission fluid. hope this help
 
Ok I applied 12V (considering I did it right) to the fan plug and it still won't come on.

But here is the interesting thing. If the AC is running and the fan that does work comes on and I take a screwdriver and push the fan that doesn't work a little bit it starts working!!! But when it does work it's like struggling to stay on and acts like it wants to shut off. Here is what I'm talking about:

[video=youtube;axRurt-OylU]http://www.youtube.com/watch?v=axRurt-OylU&list=UUaPn3LGj7eU7oLOtdQSpgTA&index=1[/video]
 
fxlr8 said:
Looks like it's time for a replacement fan.

Sent from my SCH-I535 2
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Based off what he said, I would agree. The fan clutch has too much resistance that u need to give it a little push to start going. With the car off try spinning both fans by hand to see how much more resistance the non-working fan has BS working fan. least now u have more reason to replace rather then just guessing.
 
You said "considering i did it right", not sure how you did it but I strongly suggest to follow TurTLeG lead and perform the second step, which is to check the integrity of the voltage the fan is receiving via its dedicated terminals, so that you 100% isolate the problem, I would hook up a voltmeter in parallel with the fan terminals, start the car and then shortly start the AC, find out if the fan receives a voltage in due time and how much. If it gets the right voltage in the right time then definitely your fan is out.


Sent from my iPad
 
But would one bad fan cause the car to overheat? Turning the AC on will load the engine more, but is it enough to cause overheating? In a former car, I used much smaller fans than OEM for turbo clearance and the car never overheated. I've seen people use only one fan without any issue. I could see the temperature going up if one fan doesn't work, but would it go all the way up to high?
 
Ataher said:
You said "considering i did it right", not sure how you did it but I strongly suggest to follow TurTLeG lead and perform the second step, which is to check the integrity of the voltage the fan is receiving via its dedicated terminals, so that you 100% isolate the problem, I would hook up a voltmeter in parallel with the fan terminals, start the car and then shortly start the AC, find out if the fan receives a voltage in due time and how much. If it gets the right voltage in the right time then definitely your fan is out.


Sent from my iPad
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The right time being as soon as AC is on based on the feedback from members with the same ride.


Sent from my iPad
 
I noticed the condenser sits on the same side as the fan that's not working so maybe that's why? Maybe since the fan isn't blowing air on it
 
shadow191 said:
But would one bad fan cause the car to overheat? Turning the AC on will load the engine more, but is it enough to cause overheating? In a former car, I used much smaller fans than OEM for turbo clearance and the car never overheated. I've seen people use only one fan without any issue. I could see the temperature going up if one fan doesn't work, but would it go all the way up to high?
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For ur case/car. U most likely installed a high rating fan. I think fans are rated at cfm. Whatever is it, ur smaller fan was more efficient. I had to do the same thing when I upgraded to a thicker radiator and needed a smaller single fan for clearance. Its not always about the amount of fans, its about how much air is moved and the fan shroud also plays a bigger role then u expect.
 
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