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021942TMS14 - Turner Motorsport Aluminum Coolant Expansion Tank Relocation Kit - E82 E88 135i (N54)

Turner Motorsport Aluminum Coolant Expansion Tank Relocation Kit - E82 E88 135i (N54)

Hotside intakes are a very common modification for N54 powered BMWs. Here at Turner Motorsport, we found ourselves unsatisfied with all existing solutions to relocate the coolant expansion tank to the cold side of your engine bay, freeing up real estate on the hot side. We decided to make an end all be all solution for people looking to relocate your expansion tank. All CAD designed in-house, our N54 aluminum expansion tank relocation kit allows you to seamlessly mount our new aluminum expansion tank on the cold side of your engine bay, featuring an integrated power steering pump reservoir mount. During the design process, we did everything possible to ensure no air pockets could develop in the cooling system even during spirited drives. The baffled tank is all TIG welded 5052 aluminum construction, featuring a carefully designed bleed passage. We also machined all of our bungs to accept OEM hose ends, to keep the fit and finish as OE+ as possible. Keeping with this same mindset, we made sure that coolant elevation matches OE exactly, and integrated a power steering pump reservoir mount. Our aluminum expansion tank accepts the OE coolant level sensor, bleeder screw, and coolant cap, but we include new ones with this kit, as we thought you should replace them during installation. See more about these features in the list below, and if you have any additional questions please feel free to call into our staff of skilled BMW enthusiasts at 1-800-280-6966. Find our Installation Guide HERE Features and benefits: TIG welded 5052 aluminum construction, wrinkle black powder coated Utilizes factory coolant capacity and expansion volume CAD designed to retain OE coolant elevation, which prevents air pockets Baffled tank ensures that air pockets will not be created under spirited driving conditions, and ensures accurate coolant level reading Meticulously designed bleed passage prevents air pockets while the engine cools All bungs machined for factory hose end compatibility (no barb fittings!) Integrated power steering reservoir mount Kit includes Turner Motorsport aluminum expansion tank, Turner Motorsport wiring harness, all necessary hoses, hardware, OE level sensor, bleeder screw, and coolant cap This product fits the following BMWs: 2008-2013 E82 135i 2007-2013 E88 135i

Turner Motorsport

T#: 568368 | Part#: 021942TMS14

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Compatible with hotside and coldside (OE location) intakes

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SALE: $693.59 (15% OFF)

WAS: $815.99 on 05-03-2026

This product was last offered at the strikethrough price on
05-03-2026

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Est. Ship Date:

on Aug 10, 2026

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Product Details

During the design process, we did everything possible to ensure no air pockets could develop in the cooling system even during spirited drives. The baffled tank is all TIG welded 5052 aluminum construction, featuring a carefully designed bleed passage. We also machined all of our bungs to accept OEM hose ends, to keep the fit and finish as OE+ as possible. Keeping with this same mindset, we made sure that coolant elevation matches OE exactly, and integrated a power steering pump reservoir mount. Our aluminum expansion tank accepts the OE coolant level sensor, bleeder screw, and coolant cap, but we include new ones with this kit, as we thought you should replace them during installation. See more about these features in the list below, and if you have any additional questions please feel free to call into our staff of skilled BMW enthusiasts at 1-800-280-6966.

Find our Turner Aluminum Expansion Tank Installation Guide HERE

Features and benefits:

TIG welded 5052 aluminum construction, wrinkle black powder coated
Utilizes factory coolant capacity and expansion volume
CAD designed to retain OE coolant elevation, which prevents air pockets
Baffled tank ensures that air pockets will not be created under spirited driving conditions, and ensures accurate coolant level reading
Meticulously designed bleed passage prevents air pockets while the engine cools
All bungs machined for factory hose end compatibility (no barb fittings!)
Integrated power steering reservoir mount
Kit includes Turner Motorsport aluminum expansion tank, Turner Motorsport wiring harness, all necessary hoses, hardware, OE level sensor, bleeder screw, and coolant cap

This product fits the following BMWs:

2008-2013 E82 135i
2007-2013 E88 135i

*NOTE: This product is only for N54 powered 135i vehicles. If you are looking for our aluminum expansion tank relocation kit for 335i, see T#568369

Prop 65 Warning

Cross Reference

17137640514
17137567462
17137519368
17137543026
17137607482
17117639020
17117521071

Kit Contents

Qty	Description	T#	Part#	Lifetime
1	Turner Aluminum Expansion Tank	T#568365	021942TMS01~A	YES
1	Turner Expansion Tank Wire Harness - E9X/ E8X N54	T#568366	021942TMS05~A	YES
1	N54 Aluminum Coolant Expansion Tank Relocation Kit - 135i	T#568344	021942TMS12~A	YES
1	Flared Coolant Connection Line	T#577607	013178ECS03~A	YES
1	Bav Auto Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4	T#640208	17117639022~BAV	YES
1	Bav Auto Coolant Level Sensor - BMW E36 E39 M50/52 S50/52	T#639793	61318360855~BAV	YES
1	Silicone Expansion Tank Relocation Heater Hose	T#21735881	053082LA01~A	YES
1	Expansion Tank To Upper Radiator Hose	T#33879981	17127803838~BRP	YES

Product Q&A

Lifetime Replacement

This Product Is Covered By Our Lifetime Replacement Program

Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.

If you have any questions, would like to learn more or are ready to place a replacement claim, click here!

Fits These Cars

MAKE	MODEL	SUBMODEL	ENGINE	Special Fitment Notes
BMW	E82	135i	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E88	135i	N54 3.0L	Use vehicle selector to confirm fitment

*The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.