This is the plastic heater pipe mounted on the side of the engine block under the intake manifold. It carries hot coolant from the engine block to the heater core inlet on the firewall and is prone to cracking and leaking over time. When removing your intake manifold (such as for crankcase vent replacement) it's the perfect time to replace this pipe.
This is a Genuine BMW heater pipe with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.
BimmerWorld Tip: If you are replacing this inlet pipe on an E46, E39, E85, Z3, or Z4 chassis, it's not uncommon for the return line to break off, often right at the block. If yours hasn't broken yet, now is a great time to prevent it down the road. For this reason we recommend picking up the heater return pipe as well, part # 11537502525.Rein, listed in the related items below. We also have an upgraded metal version, part # 11537502525.URO also listed below.
BMW Fitments: 3 SeriesE46 (99-05) > 320i
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 325xi
E46 (99-05) > 328Ci
E46 (99-05) > 328i
E46 (99-05) > 330Ci
E46 (99-05) > 330i
E46 (99-05) > 330xi
5 SeriesE39 (97-03) > 525i
E39 (97-03) > 528i 99-00
E39 (97-03) > 530i
X3 SeriesE83 X3 (04-10) > X3 2.5i M54 (2004-2005)
E83 X3 (04-10) > X3 3.0i M54 (2004-2006)
X5 SeriesE53 X5 (00-06) > X5 3.0i M54
Z SeriesE36/7 / E36/8 Z3 (96-02) > Z3 2.5
E36/7 / E36/8 Z3 (96-02) > Z3 2.8 99-00
E36/7 / E36/8 Z3 (96-02) > Z3 3.0
Z SeriesE85 / E86 Z4 (03-08) > Z4 2.5i M54
E85 / E86 Z4 (03-08) > Z4 3.0i M54