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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 04-28-2015, 08:14 PM
cn90 cn90 is offline
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Heater Hoses maintenance at 150K

Hi guys,

Just wondering what you guys think re Heater Hoses maintenance at 150K. Having owned many cars over the years, I understand that the heater hoses are unreliable after some 17y/150K miles.

In May 2006, at 90K, I overhauled the cooling system (rad, 2 rad hoses, WP, fan clutch, reservoir, belts, tensioners etc.). I did NOT touch the heater hoses.

There are about 7 hoses I want to replace (at the rear of engine, at heater valves, throttle body and the long hose from reservoir). The cost is about $100 or so. But I wonder what you guys think...





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  #2  
Old 04-28-2015, 08:55 PM
edjack edjack is offline
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Sounds like a good idea. I did mine just recently at 148k. Weren't hard, but one less thing about which to worry.
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  #3  
Old 04-28-2015, 09:53 PM
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TheHockeytowner TheHockeytowner is offline
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214k here, I've never touched them. Winter is effectively over in MI, so if they're waiting to break, now is as good a time as any.
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Old 04-29-2015, 12:12 AM
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Zerodynamic Zerodynamic is offline
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Quote:
Originally Posted by edjack View Post
Sounds like a good idea. I did mine just recently at 148k. Weren't hard, but one less thing about which to worry.
What condition were your hoses in?
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Old 04-29-2015, 04:56 AM
nedmon nedmon is offline
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Just do it. I replaced mine last year and found one weeping pinhole. I didn't replace that plastic pipe part 5 and am now wondering if I should at 180k miles
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Old 04-29-2015, 05:29 AM
cn90 cn90 is offline
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Originally Posted by nedmon View Post
Just do it. I replaced mine last year and found one weeping pinhole. I didn't replace that plastic pipe part 5 and am now wondering if I should at 180k miles
For 1996-1998 M52 engines, I think #5 is metal.
Later years: plastic.
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Old 04-29-2015, 09:36 AM
Max_VQ Max_VQ is offline
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2001 530 with 271,000 miles and I have no plans to replace them. With the milage on the car, I don't replace any more parts that "might" fail.
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Old 04-29-2015, 10:11 AM
Chisum Chisum is offline
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Mine are weaping now at 132K it's on my list of things to replace.

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Old 04-29-2015, 10:46 AM
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TheHockeytowner TheHockeytowner is offline
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Originally Posted by Max_VQ View Post
2001 530 with 271,000 miles and I have no plans to replace them. With the milage on the car, I don't replace any more parts that "might" fail.
Amen!
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Old 04-29-2015, 12:02 PM
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This is great information for the heater-hose thread, so I'll cross reference.
- How to locate all the cooling system hoses in the BMW E39 (1)

I think, at this point in the E39 life, that all the rubber is likely due for replacement.
- What is the recommended parts list for a complete cooling system overhaul (1)

What we need is a comprehensive list of all the hoses, if that doesn't already exist in the two combined threads above...

See also:
- What is the recommended parts list for a complete cooling system overhaul (1) quickie telephone verbal instructions for unlocking the high instrument cluster on the E39 to test the koolant KTMP (1) & how to tell whether you have the high or low on board computer cluster (1) & a video showing how to unlock the low OBC (1) or the high OBC cluster for diagnostics (1) & how to change the OBC MID IHKA KTMP temperature from degrees Celcius to Fahrenheit (1) & how to locate all the cooling system hoses in the BMW E39 (1) & how to non-destructively remove the heater hoses (1) or radiator nipple (1) or expansion tank nipple (1) or overflow hose Oetiker clamp (1) & how not to misplace the thermostat wiring loom (1) & how not to twist a plastic bleeder screw (1) & the cn90 trick to get the fan clutch nut back on (1) & bluebee tricks to get the radiator back on in the I6 automatic (1) & the teklord69 trick to cutting the fan shroud so that the viscous van clutch nut can be removed easily (1) & what is the proper coolant level bobber stick height (1) & what to do when your expansion tank coolant level sensor float measuring stick is MIA missing in action (1) & a mechanical fan clutch delete to switch to an electrical fan (1) & where to find leaks when the CHECK COOLANT LEVEL is lit on the instrument cluster (1) & a pictorial saga of all the ways the cooling system can fail (1) & how to diagnose lack of HVAC/IHKA heater core heat with cooling system (auxiliary pump) at idle (1) & where the coolant level sensor cable goes (1) & what is the o-ring size for the coolant temperature aux fan thermoswitch (1) & how the thermostat works, including what the normal temperature of the coolant is when the thermostat opens under normal conditions (1) & how to remove just the expansion tank to repair a leak during your cooling system overhaul (1) & how the expansion tank works (1) & users' behr/hella cooling system autopsy photos (1) & what to check on your new Behr/Hella expansion tanks to ensure it's not DOA (1) & how to test the cooling system auxiliary electrical fan (1) & a how to replace the aux fan (1) & where is the auxiliary fan fuse F75 (1) & where is the aux fan relay (1) & how to make your own BMW special cooling & belt drive system counterhold tools (1) & how to retrofit brass bleeder screws (1) & how to modify the cooling system expansion tank 2 bar cap to 1.2 bar to vent at a lower pressure (1) & how to modify the cooling system pressure with zero psi coolant (1) & how to eliminate weak recycled plastic with Zionsville aluminum (1) & how not to (JB Weld) fix a cracked radiator or other cooling system overhaul leaks (1) & how to tell the age of your cooling system by its date date codes, stickers, and plastic molded markings (1) & how to retrofit a coolant level sensor to an E39 that doesn't have it (1) & how to test the cooling system auxiliary electrical fan (1) (2) & a DIY for how to replace the aux fan (1) (2) (3) & where is the infamous auxilliary fan Fuse F75 (1) & where is the auxiliary fan relay (1) & summary advice to provide users who suspect a major engine repair due to overheating (1) & how to test an overheated engine for a blown head gasket, cracked heads, a warped block, stripped head bolt threads, cam seizures, contaminated bearings, coolant hydrolock, or piston, ring, or valve damage (1) & what are the major factors in deciding whether to rebuild the engine, replace the engine, or sell the car (1) & a DIY for replacing the I6 M54 head gasket (1) & a DIY for replacing the V8 M62TU head gasket (1) & why these engines are so prone to heat-related damage in the first place (1) & welding the crack between cylinder #3 and the water jacket on the exhaust side (1) & what engine swaps are most recommended (1) & where to obtain a new or rebuilt head (1) or a replacement short block or long block (1) & how to lift & remove the engine (1) & how long can you drive your BMW E39 with the viscous fan clutch removed (1) & what is the most often recommended coolant (1) & tricks for efficient flushing (1) draining (1) bleeding (1) and coolant refilling DIYs (1)
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Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #11  
Old 04-29-2015, 12:53 PM
lesguy lesguy is offline
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Quote:
Originally Posted by Max_VQ View Post
2001 530 with 271,000 miles and I have no plans to replace them. With the milage on the car, I don't replace any more parts that "might" fail.
Agreed. Im not sure Ive actually ever had one of those hoses fail on me..ever. Perhaps Ive just been fortunate.
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Old 04-29-2015, 01:16 PM
cn90 cn90 is offline
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I normally don't replace parts that "might" fail.
However, cooling system is the exception, when you lose coolant, the engine may go with it (blown head gasket), so when it comes to cooling system, I try to be "proactive".
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Old 04-29-2015, 03:07 PM
nedmon nedmon is offline
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Thanks CN90 re that Part 5 heater pipe maybe being metal, not plastic. I will give it the scratch test to find out what it is.
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Old 04-29-2015, 03:18 PM
poolman poolman is offline
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Probably need to do mine, pushing 310,000 on the car now
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Old 07-13-2015, 09:25 AM
Agimat Agimat is offline
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I just found out today that one of these hoses (4,5 and 8) need to be replaced so I'm having my indy replace them all. For months, the car had rough idle during cold start, and had a cooling system overhaul over the last 6 months (meaning pretty much all components have been replaced after two overheats). The leaks in these hoses were undetected until it got big enough to have coolant leaking under the water pump. It is a 16-year old car and nothing was replaced under the intake manifold as shown by the car's service record in the last 5 years. Since this will be opened up during the hose R&R, what other things should I ask my indy to have replaced?
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Old 07-13-2015, 09:33 AM
Agimat Agimat is offline
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Here is the attachment I forgot for my post above:
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  #17  
Old 07-13-2015, 10:22 AM
WaveSurfin3100 WaveSurfin3100 is offline
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If you have the funds, replace the knock sensors and hoses the from the heater control valve that run to the firewall...Any other vacuum hoses and rubber caps under and behind the Intake Manifold. Lately I've seen more and more starter issues, so maybe replacing the starter wouldn't be a bad idea!?
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Old 07-13-2015, 11:06 AM
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Wgosma Wgosma is offline
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Quote:
Originally Posted by TheHockeytowner View Post
214k here, I've never touched them. Winter is effectively over in MI, so if they're waiting to break, now is as good a time as any.
199K here, same status as your car. Original hoses.

Bill
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Old 07-13-2015, 01:42 PM
194449 194449 is offline
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Quote:
Originally Posted by Agimat View Post
I just found out today that one of these hoses (4,5 and 8) need to be replaced so I'm having my indy replace them all. For months, the car had rough idle during cold start, and had a cooling system overhaul over the last 6 months (meaning pretty much all components have been replaced after two overheats). The leaks in these hoses were undetected until it got big enough to have coolant leaking under the water pump. It is a 16-year old car and nothing was replaced under the intake manifold as shown by the car's service record in the last 5 years. Since this will be opened up during the hose R&R, what other things should I ask my indy to have replaced?
Knock sensors
Dual-temp sensor between cyls 5 & 6

Like the two fiberglass heater pipes, these are virtually impossible to reach, let alone replace unless the intake manifold is off. I don't read much about anyone having trouble with the knock sensors, but the cheap dual-temp sensor has been known to go bad.

When you have the manifold off, it's also much easier to replace the entire CCV system, or the starter if it's a suspect, but these are things that many people still manage to replace even with the manifold in place.
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Old 07-13-2015, 03:09 PM
edjack edjack is offline
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Originally Posted by Zerodynamic View Post
What condition were your hoses in?
Still soft and pliable.
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  #21  
Old 08-24-2015, 02:50 PM
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energizedmortal energizedmortal is offline
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Quote:
Originally Posted by cn90 View Post
Hi guys,

Just wondering what you guys think re Heater Hoses maintenance at 150K. Having owned many cars over the years, I understand that the heater hoses are unreliable after some 17y/150K miles.

In May 2006, at 90K, I overhauled the cooling system (rad, 2 rad hoses, WP, fan clutch, reservoir, belts, tensioners etc.). I did NOT touch the heater hoses.

There are about 7 hoses I want to replace (at the rear of engine, at heater valves, throttle body and the long hose from reservoir). The cost is about $100 or so. But I wonder what you guys think...






Hello CN90,

In your first illustration hose #12 on my 2003 does not go into the engine, it connects to the hose that is coming from the aux water pump. Do you know the correct part number for the hose I am referring to?

Update: found it part number is # 64218378369

Last edited by energizedmortal; 08-27-2015 at 01:14 PM.
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  #22  
Old 04-13-2017, 08:57 PM
cn90 cn90 is offline
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Hi guys,

I started this thread in 2015 (2 years ago), now I need to revisit this issue as the car is 20 years old (build date was Sept. 1997) and with 165K miles.

If any of you ever had a busted heater hose(s), when did that happen (year/mileage)?
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  #23  
Old 04-14-2017, 05:50 AM
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energizedmortal energizedmortal is offline
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Originally Posted by cn90 View Post
Hi guys,

I started this thread in 2015 (2 years ago), now I need to revisit this issue as the car is 20 years old (build date was Sept. 1997) and with 165K miles.

If any of you ever had a busted heater hose(s), when did that happen (year/mileage)?
192,000 miles/15 years and none have busted or leaked. At 190,000 miles none of them were leaking but I changed all except heater hose part# 64218378369. Going to use it as a test subject and let you know if and when it fails.
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  #24  
Old 04-14-2017, 04:40 PM
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Originally Posted by TheHockeytowner View Post
214k here, I've never touched them. Winter is effectively over in MI, so if they're waiting to break, now is as good a time as any.
216k


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thats how i roll.. when she bleeds coolant I run red lights
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Old 04-14-2017, 04:46 PM
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CN90, I just do all the hoses, including the heater hoses as part of your proscribed 100k mile cooling system overhaul.
So they've been replaced twice on my car now. They are cheap, and when everything else is being done, only adds an extra hour of work. Parts are cheap.

Even Mike Miller the tech from Roundel recommends 150k hose replacements (all of them). He says oem BMW hoses are some of the best quality around.
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