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View Full Version : There's an E-box fan?


Jon K
07-09-2006, 09:59 AM
Where? Bentley says there is an E-Box fan, 2", but I don't see one...
winfred
07-09-2006, 10:20 AM
only some cars have the fan, theres a place for it in all of them it's just not installed
shogun
07-09-2006, 10:48 AM
I have one in the E32 750, sits behind the glovebox compartment. If you follow the plastic chute from the IHKA to the e-box, you'll find it. Sits behind the carpet in a black plastic box. Can be disassembled from the cabin when it starts singing/chirping like a bird.
Costs around 50 $ and looks like a fan for a PC.
Russell
07-09-2006, 11:55 AM
Which cars?
Not sure mine has one. If so where is it located?
Martin in Bellevue
07-09-2006, 11:58 AM
My 535, build Nov '88 has the fan.
Jon K
07-09-2006, 12:22 PM
Is the fan an inlet or exhaust - does it suck into the ebox or exhaust out of the ebox?
Martin in Bellevue
07-09-2006, 12:31 PM
Is the fan an inlet or exhaust - does it suck into the ebox or exhaust out of the ebox?
I think it blows cabin air into the ebox.
Jeff's 90? 535 doesn't have the fan.
shogun
07-09-2006, 12:53 PM
Is the fan an inlet or exhaust - does it suck into the ebox or exhaust out of the ebox?

That is clear, it blows cold air from the aircon into the box. Has 2 speeds and in the e-box is a temperature feeler. Always blows, 2nd stage at 44 degree celsius.
http://www.realoem.com/bmw/showparts.do?model=GC81&mospid=47354&btnr=12_0351&hg=12&fg=35

Part 12901720343 (BLOWER UNIT) was found on the following vehicles:


E31: Details on E31
E31 840Ci COUPE
E31 840i COUPE
E31 850Ci COUPE
E31 850CSi COUPE


E32: Details on E32
E32 735i SEDAN
E32 735iL SEDAN
E32 750iL SEDAN
E32 740i SEDAN
E32 740iL SEDAN


E34: Details on E34
E34 525i SEDAN
E34 535i SEDAN
E34 525i TOURING
E34 530i TOURING
E34 530i SEDAN
E34 540i SEDAN
E34 M5 3.6 SEDAN
Jon K
07-09-2006, 02:11 PM
Wow that is interesting Shogun - they are airconditioning the ECU box? That's going to introduce moisture without a doubt. I saw that there are "blanks" in the rubber sealing around my ECU box but I didn't know what would go there. Looks like I may throw a little 60mm fan in there for some added cooling.
Bill R.
07-09-2006, 02:20 PM
air thats cooling the box. Unless you have a humidity controlled prius.:)




Wow that is interesting Shogun - they are airconditioning the ECU box? That's going to introduce moisture without a doubt. I saw that there are "blanks" in the rubber sealing around my ECU box but I didn't know what would go there. Looks like I may throw a little 60mm fan in there for some added cooling.
Jon K
07-09-2006, 02:26 PM
air thats cooling the box. Unless you have a humidity controlled prius.:)


Heh yeah but sometimes when I'd use the AC in the hot muggy summer days, when the cold ac air met the hot sticky cabin air it'd blow fog out of th events.
Alexlind123
07-09-2006, 02:54 PM
air thats cooling the box. Unless you have a humidity controlled prius.:)

If the air is really cold, moisture could condense on the electronics.
Bill R.
07-09-2006, 03:01 PM
drains out through the drain hole. Air after passing through the evaporator is dehumidified and chilled. The cold dry air then gets pulled into the ebox by the fan where it can absorb some of the moisture already present in the ebox if there is any. That air then goes back into the cabin and if the air is on recirculate gets pulled through the evaporator again, chilling down and depositing its moisture that it picked up on the evaporator starting the cycle over and over.


If the air is really cold, moisture could condense on the electronics.