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BMW 7-Series Maintenance and Repair

751 messages,  Last post on Dec 05, 2009 at 11:40 AM

You are in the BMW 7-Series Forum. Your Hosts are pat & karens

What is this discussion about? BMW 7 Series, Electrical, Engine, Sedan


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#646 of 751
98 Radiator Neck Leak by sysadb420
Feb 23, 2009 (2:40 pm)
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My apologies if my post comes across the 3rd time, but I just joined and there seems to be a problem posting. This neck is the plastic bend on the top on the driver side of the radiator. It's a small leak and I was wondering whether anyone has been able to stop the leak with a special glue or something.
#647 of 751
Re: 98 Radiator Neck Leak [sysadb420] by Mr_Shiftright HOST
Feb 23, 2009 (5:57 pm)
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Replying to: sysadb420 (Feb 23, 2009 2:40 pm)

That might be tough given the heat and pressure, but I have successfully mended a hole in the plastic intake of a BMW heater core with JB Weld, and lasted for a long long time. Worth a shot, that radiator can't be cheap...let's see....
 
Actually for a 745 model it's only $300...that's not bad at all. My Porsche 928 was $1200 bucks.
#648 of 751
Re: 98 Radiator Neck Leak [Mr_Shiftright] by sysadb420
Feb 24, 2009 (6:26 am)
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Replying to: Mr_Shiftright (Feb 23, 2009 5:57 pm)

Thanks, I had a shop try some glue but it didn't hold. He said it held and he pressure tested it and all was well, but I'm wondering if the plastic contracted when it cooled and cracked the glue. I notice it tends to leak more as it cools...
 
This 740i only has 70K miles and is otherwise in great shape. I might give the JB Weld a try. The independent shop also said the radiator was "a couple hundred bucks".
 
One thought for owners with power steering hose issues - while hoses may go bad, a leak might not necessarily be because the hose is bad. My BMW dealer said the hoses needed to be replaced, but I looked closer and one of the hoses was leaking from the top end (and running down the hose). Turns out the clamp was deteriorating. Thanks, BMW dealer.
 
Ironically, I also had a 928. Unlike the 7-series, nothing was reasonably priced, especially the torque tube. I got tired of the timing belt triggering the warning light and dumped it. Not knowing if it was really worn/loose was just too stressful.
#649 of 751
Re: 98 Radiator Neck Leak [sysadb420] by Mr_Shiftright HOST
Feb 24, 2009 (8:39 am)
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Replying to: sysadb420 (Feb 24, 2009 6:26 am)

JB Weld is pretty awesome stuff but you have to do very good prep work. It won't work on anything that moves or flexes however.
#650 of 751
Re: 98 Radiator Neck Leak [Mr_Shiftright] by sysadb420
Feb 24, 2009 (9:51 am)
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Replying to: Mr_Shiftright (Feb 24, 2009 8:39 am)

I'll find out which glue the shop tried. The plastic neck seems reasonably firm, but its subject to jarring, obviously. I also saw an amazing epoxy that sets up fast used by a body shop to reattach the flexible plastic trim under the driver door. I might ask them for it.
 
If not I guess it's a new radiator.
#651 of 751
Re: 98 Radiator Neck Leak [sysadb420] by Mr_Shiftright HOST
Feb 24, 2009 (10:04 am)
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Replying to: sysadb420 (Feb 24, 2009 9:51 am)

yeah well welcome to the BMW radiator club.
#652 of 751
Re: 98 Radiator Neck Leak [Mr_Shiftright] by blckislandguy
Mar 08, 2009 (5:55 pm)
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Replying to: Mr_Shiftright (Feb 24, 2009 10:04 am)

I find it truly amazing that the American consumer puts BMW, Range Rover, and other car lines into the SuperBrand category. The monthly maintenance bills on an out of waranty Bimmer or Rover have got to average $500 a month. For the Ultimate Drivers Machine to use plastic components such as plastic water pump impellers in the cooling systm is absoutely irresponsible. The typcial new GM car has zero, repeat zero maintenance out to 100,000 miles. Just change the oil, use synthetic if you are a keeper, and rotate the tires once in a while and you are free to travel about the country until 100,000 miles.
 
Oh, well this must be the reason that a flawless 06 750i is now worth less than 40K.
#653 of 751
Re: 98 Radiator Neck Leak [blckislandguy] by Mr_Shiftright HOST
Mar 08, 2009 (7:20 pm)
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Replying to: blckislandguy (Mar 08, 2009 5:55 pm)

They are wonderful cars to drive and you pay for the privilege of that experience, and for the prestige of ownership. You simply cannot compare apples and oranges. A bicycle would be even cheaper to maintain.
 
And it's not $500 a month. With the worst of luck, maybe $250 a month out of warranty. Still cheaper than buying a new Yaris.
#654 of 751
98 740i mysteriously died by dannyt740i
Mar 11, 2009 (4:23 pm)
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Hello all, I am brand new to this forum and a brand new BMW owner. I recently purchased a used 98 740i, have had it for 2 weeks and have fallen absolutely in love with it. That said, the car mysteriously and suddenly died while driving on the highway. It was as if it ran out of gas. I am trying to save some money on the mechanic and am going to try and diagnose the problem myself, and thus far am waiting on the repair manual cd's in the mail.
 
I wanted to pose to the community if there is a common problem with these symptons. It very well could be and probably is a fuel filter or pump or something of the sort, but was wondering if anyone had any info. I did not run out of gas, and all of the electrical components outside of the hood are working fine, but I have not tested anything under the hood yet.
 
Anything would be helpful,
 
Thanks
#655 of 751
Re: 98 Radiator Neck Leak [blckislandguy] by sysadb420
Mar 18, 2009 (2:18 pm)
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Replying to: blckislandguy (Mar 08, 2009 5:55 pm)

Bickisland - by maintenance I assume you mean repairs? My car is not the best example since I only just turned 70K miles on my 98, but I have spent $1200 on repairs since I bought the car in August 2000. I've spent another $1700 on service including F&R brakes and 2 batteries. To be fair, several items broke during the warranty 4-year period including the water pump and the CD changer. It also had electrical issues with most of the exterior lights. That problem seemed to be a design issue as a service bulletin repair straightened it out. But with my car the bottom line is that most problems were caught and fixed during the warranty period and have not re-occured.
 
I've had very few problems since the warranty ran out June 2002. This radiator leak is the first in awhile. I bought the two year old car for $41.5K in 2000 with 13.6K miles on it, and could easily sell it for $10K now. So from my perspective it's cost me about $31K in depreciation plus $3K in maintenance and repairs. Not bad, IMO, for 8.5 years of driving the best. I would admit that the equation is more expensive if you buy one new due to the rapid depreciation the first couple years. But the flip side is that you can buy a fabulous used car at a good price due to that depreciation.

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