E39 Aux fan (electric fan)

[seewai]

Bros,

Edit: Just realised this topic is AUX FAN and not A/C fan, my bad!

Just to update y'all on a/c fan running at max speed for couple of weeks on my ride. After releasing the a/c coolant pressure of about 30 ( IIRC from 350 to 320 or something like that), the a/c fan "loud noise" has since gone. Thanks to Naidu.

According to Naidu, if the a/c compressor is "new", pressure of 250-280 is optimal. As the one found in my ride could have already been 8 years old, it's preferable to have slightly on the high side, eg 300 or more.

Not sure if this has already been posted somewhere else by other bros here but I'm more than glad to share it again here for the benefit of all.

New a/c compressor unit could cost RM1500, not sure if it's genuine or not.

Cheers.
seewai

 

[Herbert]

The new compressor is Nippon Denso. Naidu changed mine 2 years ago.

 

[haywire]

Guys, my aux fan just ran very noisy today after a car wash. Temp was right at the middle. No overheating. Popped the hood, cool down a little, checked the water level. Floater came up. So I assume no water loss. Started the car again, with AC on, clutch fan was moving slowly, Aux fan wasn't moving. Temp gauge still in middle. Rev up abit, clutch fan ran faster, aux fan wasn't moving. Rev more, clutch fan was very fast and aux fan kicks in with SUPER noise ! Never had that before the car wash...

Any idea if this was normal ?

Bro, before the car wash your car was sufficiently cooled because it was moving and probably the fans were working so that the engine is at an optimum temperature.

When your car was stopped and turned off for the wash, temperature rises because the fan was not working but the engine is still hot. So say when you stopped the car, the temp was 85, by the time the car was washed the temp has climbed to 95 (as an example) so the aux fan kicks in at max speed and noise to bring it back down to 85.

 

[bimmerholic]

Bro, before the car wash your car was sufficiently cooled because it was moving and probably the fans were working so that the engine is at an optimum temperature.

When your car was stopped and turned off for the wash, temperature rises because the fan was not working but the engine is still hot. So say when you stopped the car, the temp was 85, by the time the car was washed the temp has climbed to 95 (as an example) so the aux fan kicks in at max speed and noise to bring it back down to 85.

Very well said :top:

 

[lwloh]

As i had water temp problem recently, (which was traced out due to burned head gasket) and based on my experience on seeing the coolant temp on board while running, the aux fan will start to run at a higher speed once coolant temp (under test 7 on OBD) reaches 100C. Once it reaches 110, it will run at the highest speed. Once it touch 115C for about 5 secs or more, the water temp gauge will start to move higher to the right.

 

[Herbert]

Loh,

So what is the status of your engine? You managed to get top engine block?

 

[lwloh]

Loh,

So what is the status of your engine? You managed to get top engine block?

Yes, Albert, WP Auto managed to get a 528 top block. He told me susah to find 530 top block. I do not want to change engine by the way. He told me the top block for 528 is same as 530. Use back all my camshaft, valve,valve spring, etc. Now the engine is running so far so good for a week. Coolant normal operating temp about 88-90C. Power is also much better than before with the blown gasket. Cost i do not know yet. he have not bill me. maybe he calculating how to chop me nicely. haha. kidding guys.. but i am told to expect about rm 5K. dang.. dang.. dang...

 

[Herbert]

Plenty of 528 top block around chop shops so I am surprise the figure of RM5k was mentioned.

 

[Creazee]

Hi guys, just like to check with all sifus here whether anyone had faced the problem that i'm facing now.... My temp guage will fluctuate once in a while (radiator and water pump changed recently)... according to mech its the aux fan not kicking-in at times.

From the little research that i've done, it could also be the compressor (mech rule it out cos air-cond still cold), the temp switch (which i don really know how to verify this).

Is there any other possiblity to the problem??? Don want to jump to change the aux fan before fulling out all possibility.

Cyne... sorry ah ... pinjam your threat for this don want to start a new threat for the same thing

Hope bros here could enlighten me on such issue... thanks in advance

 

[tweiboon]

Bro, your fan is not driven by the belt. The fan that you see attached to the front end of your engine is your clutch fan. It is driven by a fluid coupling device that allows the fan to rotate at low or high speed depending on the temperature. The expansion of the bimetallic strip attached to the fan clutch is what engages the speed of the rotation of the fan.

The other fan is known as the AUX fan fitted just behind the grills. This is electrically driven.

Conclusion: No fans in E39 runs on belt. BUT the E39 fans run on RACUN!!!

Today i send my e39 to BM World. And i replaced adjusting and deflection pulley. So they removed the belt from my fan. And what i saw is my fan is not running after remove the belt. My e39 fan is attached to a belt which drive my the bottom big pulley which directly drive my crankshalf. They has started the car when the belt is removed to prove the fan is pull by the belt. The speed of the fan is determine by the fan clutch. Meaning if the belt is break off then the fan will not turn anymore.

My previous e36 fan is also same as my e39. My e36 belt was broken off until i am not able to drive to BM World and the temp guage showing the red light and been force to stop beside the roadside after the Sungai Besi Toll. After that i call the tow service to carry my car to BM World to change the alternator and belt. The belt broken off due the alternator jammed at that moment.

 

[tweiboon]

Bro, your fan is not driven by the belt. The fan that you see attached to the front end of your engine is your clutch fan. It is driven by a fluid coupling device that allows the fan to rotate at low or high speed depending on the temperature. The expansion of the bimetallic strip attached to the fan clutch is what engages the speed of the rotation of the fan.

The other fan is known as the AUX fan fitted just behind the grills. This is electrically driven.

Conclusion: No fans in E39 runs on belt. BUT the E39 fans run on RACUN!!!

The pulley itself is attached to pull the water pump and the clutch fan at the sametime. Without the belt driven by crank pulley how the clutch fan can be running ? Fan clutch is just control the speed while the pulley is rotating pulled by the belt.

 

[siva@e60]

hi guys but mine the aux fan very noisy after 3,000rpm it stops rite.