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#1
06-10-2015, 06:19 PM
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Transmission Air Duct??
Hi Guys,
I am new to the forum and just picked up a 2001 x5 3.0. I am replacing the radiator/air ducts on my new project and was doing some research and came across a diagram showing the radiator and all the air ducts. My question is do the E53 3.0’s have a air duct to the transmission? I do not see it in my X5 and have searched and found very little information about it online. If mine is missing should I replace it? Thanks for the help. 
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#2
06-10-2015, 08:37 PM
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I believe the ducts you are speaking about are brake ducts on the left and right of the radiator. See Image Below
# Part Number Description Qty 01 51718264181 AIR DUCT FRONT LEFT (to 10/03)1 $32.18 01 51717123349 AIR DUCT FRONT LEFT (from 10/03) $32.18 02 51718264182 AIR DUCT FRONT RIGHT (to 10/03) $32.18 02 51717123350 AIR DUCT FRONT RIGHT (from 10/03) $32.18 03 51118174185 EXPANDING RIVET - SCHWARZ $0.50 04 51717028938 AIR DUCT,TRANSMISSION/BRAKE, FRONT LEFT (to 10/03) $32.18 04 51717123353 AIR DUCT, TRANSMISSION (from 10/03) $32.18 05 07119901311 SHEET METAL SCREW ST4,8X16-C-Z2-ZNFE 5 $0.50 06 51717121615 FRONT LEFT BRAKE AIR DUCT (from 10/03) $32.18 06 51717121616 FRONT RIGHT BRAKE AIR DUCT (from 10/03) $32.18 07 51718402426 FRONT RIGHT BRAKE AIR DUCT (to 10/03 $32.18 08 07119902267 HEX HEAD SCREW WITH WASHER - ST4,8X $2.64 09 63171367868 EXPANDING NUT - ST 4.8 $0.50 10 51471911992 FIXING PLUG - SCHWARZ / BLACK $0.69 11 51718402420 AIR DUCT, RADIATOR $32.18 12 51718402436 ENGINE COMPARTMENT SCREENING, FRONT $136.74 13 07119901369 SHEET METAL SCREW - 6,3X19MM $0.71 14 07129901666 BODY NUT $1.87 15 51717123351 AIR DUCT, ORNAMENTAL GRILLE LEFT (from 10/03) $12.84 15 51717123352 AIR DUCT, ORNAMENTAL GRILLE RIGHT (from 10/03) $12.84
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 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#4
06-11-2015, 04:54 AM
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It appears on the diagram that this tube runs near the front upper section of the wheel well and is aimed at the trans along the frame rails. I would check and see if this guy is mounted towards the side, in front of the wheel wells just behind the front bumper.
It appears to be a air tube to pull air from the high pressure area near the Radiator and move it through the engine compartment to allow cooler air to hit the trans for some reason. I am sure there are owners who can explain in more detail of the actual function of the ducts. HD towing? Over engineering? If you roll underneath the left front corner (driver side) you should see this plastic tube like duct. Based on the diagram it is round not square like the E53 brake ducts.
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2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green Last edited by StephenVA; 06-11-2015 at 05:03 AM.
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#5
06-11-2015, 06:34 AM
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Here are a few shots from ECS's site showing the part. I wasn't going to really believe there was a transmission air duct when I saw this thread, then I saw the diagram. Looked it up for mine and it's supposed to be there too. I'll see if I can find it on mine and take some pics.
Search 51717113545 - 51717113545 - AIR DUCT - ES#128833 I just went to look and if it's there, it isn't visible. I imagine it would have to be a long duct too to make it back to the transmission. The thought of a duct to cool it sounds like a good idea (I have a few long tows this year to make). If anyone can find pics of install/routing, please post.
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Daily Drivers: - 2008 535i, 320,000km - 2004 X5 4.4, 01/2004 production, 420,000km - 1997 328i, 350,000km Track: - 1996 328i, track/race car, ~300,000km Winter: - 2013 Ski-Doo MXZ X 800 E-TEC, trail can - 2007 Ski-Doo MXZ Blizzard 800 HO - 2001 Ski-Doo MXZ 600 w/800 engine, exhaust - 1978 Ski-Doo Olympique 340 (vintage race sled) - 1977 Ski-Doo Olympique 340E 
Last edited by LVP; 06-11-2015 at 06:41 AM.
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#6
06-11-2015, 06:56 AM
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Look here in post #6
http://www.xoutpost.com/bmw-sav-foru...on-cooler.html Is this the duct right under the frame rail on the right side? Looks like it. The cleaner/larger ducts are the brake ones.
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Daily Drivers: - 2008 535i, 320,000km - 2004 X5 4.4, 01/2004 production, 420,000km - 1997 328i, 350,000km Track: - 1996 328i, track/race car, ~300,000km Winter: - 2013 Ski-Doo MXZ X 800 E-TEC, trail can - 2007 Ski-Doo MXZ Blizzard 800 HO - 2001 Ski-Doo MXZ 600 w/800 engine, exhaust - 1978 Ski-Doo Olympique 340 (vintage race sled) - 1977 Ski-Doo Olympique 340E
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#7
06-11-2015, 07:23 AM
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Well, I found that one in the pics I posted above. Takes off from the centre air channel on the bumper. Mine has a rubber/plastic flange at the opening that isn't lined up properly. I have to pull the bumper to fix it. Awesome. Thank you thread....
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Daily Drivers: - 2008 535i, 320,000km - 2004 X5 4.4, 01/2004 production, 420,000km - 1997 328i, 350,000km Track: - 1996 328i, track/race car, ~300,000km Winter: - 2013 Ski-Doo MXZ X 800 E-TEC, trail can - 2007 Ski-Doo MXZ Blizzard 800 HO - 2001 Ski-Doo MXZ 600 w/800 engine, exhaust - 1978 Ski-Doo Olympique 340 (vintage race sled) - 1977 Ski-Doo Olympique 340E
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#8
06-11-2015, 08:07 AM
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image of front end with bumper removed. The duct is located on right side of the image below next to the square brake duct.
__________________
2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green Last edited by StephenVA; 06-11-2015 at 08:13 AM.
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