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Old 01-06-2016, 12:02 PM
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Join Date: Nov 2015
Location: denver
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deuchant420 is on a distinguished road
Heater Return Pipe N62 Anyone done it?

I just found a leak coming from my heater return pipe where it goes into the back of the water pump. This is the small pipe which appears to be going under the manifold. The end of it has rotted away enough that it's leaking out from where it connects to the water pump. I'm wondering if there is a way of replacing it without removing the manifold. The diagrams I have looked at show it has a quick connect fitting at the back of the engine and a bolt holding it in place near the back of the engine which appears to be under the manifold. I think it may be possible to splice in a new piece into the water pump and connect it to the existing pipe where there is access at the front of the engine. Has anyone tried this repair or replacement?
Any info would be appreciated! thanks
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Old 05-16-2016, 11:18 AM
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Join Date: Nov 2015
Location: denver
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deuchant420 is on a distinguished road
Repaired

Well, since no one replied to this thread I'll update it for those that need this repair. Turns out you do need to remove the manifold to replace the pipe.
Parts needed:
manifold gaskets
heater return pipe with O ring
Optional parts:
throttle body gasket
new valley pan cover with integrated gasket(or re use and make your own gasket)
pipe that goes from the valley pan to the water pump

1 dis connect battery
2 remove the air intake parts
3 unplug, label and move all wiring in the way
4 remove positive battery cable attached to the fire wall
5 remove the cabin air filter and covers
6 remove the lower cabin air filter housing 6 bolts(this will allow a lot of access to the manifold and wiring.
7 dis connect the fuel line from the fuel rail
8 remove the throttle body and then the manifold(should just pull up and be able to squeeze it through the wiring without removing the connection to the alternator)
9 drain the coolant
10 remove 1 bolt holding the pipe and release the quick connect fitting to remove the pipe.
At this point
I decided to change the valley pan cover and pipe. Remove all the bolts, siphon or vacuum out all the coolant and inspect the coolant transfer pipe to see if you have the leaking gasket problem. I didn't.
Clean off the old gasket residue and install in reverse order.
11 Install everything in reverse order with new manifold gaskets and refill the coolant.
Fire it up and check for leaks.
Good luck
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Old 07-19-2017, 01:37 PM
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Join Date: Oct 2010
Location: WI
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hpy540 is on a distinguished road
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01Evolve M5 86k silver over black, 02 M5 indi, Dinan, white over caramel 106k. 1991 850i with 66k ttint 72 TA # matching 455HO, with a few tweaks, 06 CCSB 2500 Duramax LBZ with 120 hp efilive tune, 03 CCDRW,LB7 with a 120hp efi live tune 140k. 99 FLHT. 03 FXDWG with 103 in it. 1981 yamaha 850 3cyl. Piped and carbed, cafe in progress. 1997 26' Eliminator eagle, 548 cid BBC built by me. 93mph. Lastly the reason why i am here, 05 x5 4.4. Purchased for pocket change and trailered home.
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