Hey guys I've been having some overheating issues lately and finally decided to ask on here before I do anything else.

Car is an 03 g35 sedan, 230k been running great. New hoses, thermostat, fluid etc

About a month ago I had the temp spike up while at idle, it never went past the top line. When I drive the temp is always perfect. As soon as I come to a stop within a few seconds the temp will start to climb. Every once in a while it wont get hot while at idle but more often than not.

I read the overheating sticky and it looked like it a fan clutch for sure. I could stop the fan with the engine on so I thought for sure it was the fan clutch. I replaced the clutch yesterday- wow, its moving way more air and it is really loud. Guess that was it. Wrong. Coming up to a light within a few seconds the damn thing started to do the same thing. As soon as I started driving it went back to normal. I pulled over and parked the car with ac at idle to see how fast it would climb and I was there 15 minutes and it never got hot. WTF?


So I guess my question is, why do I need to check next? Is my electric fan not pushing enough air? Air bubbles?


Any help appreciated

thanks

 

Bleed the system.



Then bleed it again.


Then bleed it five more times.

True Story.

 

Haha, alright. I search on how to bleed the system

 

You have air in your coolant system.

You can follow the bleeding procedure in the service manual, OR you can get a lisle funnel that will make bleeding your coolant system much easier. You can get the funnel online or at most auto parts stores:

Also, regardless of which method you use, its easier to get air out of your system if you park (or jack up) the car so that its at an incline. You want the radiator to be the highest point in the system so that air bubbles can escape easier.

 

BigC is right on the money. Its what I did

 

Appreciate the help. Got the car jacked up now.


On another note, is it normal for the fan to be loud? It sounds like a goddamn Mack truck now. Can't even hear the motor. Its not even fun to drive anymore.

There's no way it came from the factory like this

 

not only are they loud but it kicks on way too often. There has to be a sensor that regulates this but I never looked into it. Good luck.

 

They shouldn't be as loud as you describe. It may be time to replace them.

They're probably turning on so often because your car is running hot. Bleed the coolant system.

 

Looking at the reviews on the brand I bought seems like it stays on the whole time. I got a refund and gonna buy a different brand.

The whole idea of the fan clutch is that is disengages at a high rpm, if not it kills gas mileage , according to what I've researched on fan clutches, haha.