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E63 / E64 6 Series (2004 - 2010)
The E63/E64 BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #1  
Old 06-10-2010, 11:13 PM
rentsr rentsr is offline
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645ci problems

Hi,
Recently I noticed my coolant level was low so i opened my hood to refill it, and i noticed that there was coolant that was all over the engine bay and sprayed on the underside of my hood. This was quite shocking, but my coolant cap was still on and under pressure so i was somewhat confused. I refilled it, and then the next morning while commuting it was making a high pitch whistling noice for a few minutes, but then died out on the freeway. The next day, it did this as well, and also when i popped my hood the coolant was everywhere once again, and also low. My car is now garaged and im not driving until this issue is resolved. I hypothysize that it is an issue with my head gaskets, but am not 100% sure. I am posting to see if anyone has ever had any similar problems or insight on my dilemma. Thanks!
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  #2  
Old 06-11-2010, 06:01 AM
Dlanoz Dlanoz is offline
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Interesting. I don't think it would be a head gasket right off the bat. Did you notice any cracks in the expansion tank? Also, there is a bleed screw, make sure that's not missing. I've seen them pop off and spray coolant everywhere once the vehicle warms up. Also, check the upper and lower radiator hoses, I know the 7 series have a problem with them. It might be happening just under load though, so it may be difficult to diagnose. Do you see dried coolant anywhere else on the engine, or is it all crusted up everywhere?

Make sure you get it fixed asap and don't drive it until you do. I would hate to see how much a head job costs on this car.
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  #3  
Old 06-11-2010, 06:59 AM
docpaulo docpaulo is offline
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you have a worn hose with a pinhole/crack somewhere... under normal pressure the hole does not leak... but at engine temps with pressure, the hose expands and the leak shows up...

take it to a mechanic...
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  #4  
Old 06-11-2010, 07:35 AM
tuckmt tuckmt is offline
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Check coolant resevoir...famous for cracking...$85 part easy to replace.
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  #5  
Old 06-11-2010, 09:24 AM
djmatrix djmatrix is offline
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If its your headgasket the engine would overheat quickly
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  #6  
Old 06-11-2010, 09:28 AM
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Hossy Hossy is offline
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Quote:
Originally Posted by docpaulo View Post
you have a worn hose with a pinhole/crack somewhere... under normal pressure the hole does not leak... but at engine temps with pressure, the hose expands and the leak shows up...

take it to a mechanic...
I had a similar experience two months ago. It actually ended up being a pinhole in the small line that runs right over the top of the radiator (some really thin, small line) right at the point where it connects to a small attachement towards the right side. Anyway, got mine fixed for $35 and not a probelm afterwards.

Definitely take it to any decent mechanic and have it pressure tested first to see if there is a crack in the reservoir or a hole in one of your lines.
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  #7  
Old 06-11-2010, 03:28 PM
rentsr rentsr is offline
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Thank you all for your feedback. In response to Dlanoz, the coolant that i noticed in my engine bay is not on around any specific area of the engine, it was everywhere on both sides of the block, and sprayed under the hood. Today i did an exhaust gas analyzer in the coolant resevoir, and it showed no exhaust gas there so i personally have ruled out the head gaskets. The only reason i suspected this is because i had it happen to a 3 series i had without ever overheating. Execpt on that car the coolant resevoir exploded due to a cracked gasket. I am happy with all your replies as my car is out of warranty, and i was dreading an expsensive repair. From what it seems i agree with you guys and do believe/hope that it is something small like a pinhole/crack/leak in a line, cracked coolant resevoir etc. Im not driving her over the weekend and come monday i will have her pressure tested to determine where/what my issue is. I will post once i find out whats going on.
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Old 06-11-2010, 07:49 PM
rentsr rentsr is offline
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I inspected the hoses while the engine was idling and I found a pinhole as you guys described. Easy fix ( i haven't done it yet but will asap & before driving). Thank you for the insight/guidance with my issue, much appreciated!
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Old 06-11-2010, 09:10 PM
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legend legend is offline
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here is what happened to me and im pretty sure you have the same problem.
the same thing exactly was going on with my 645 then one day i stopped the car while this high pitch sound was going on and when i opened my hood i discovered a small tiny hole on the side of this black collant box(expansion tank ??). the collant was spraying out of it.
so although the cap was sealed there was this small hole on the side. i dont know ow it happened but it did.
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  #10  
Old 06-12-2010, 02:31 AM
rentsr rentsr is offline
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Quote:
Originally Posted by legend View Post
here is what happened to me and im pretty sure you have the same problem.
the same thing exactly was going on with my 645 then one day i stopped the car while this high pitch sound was going on and when i opened my hood i discovered a small tiny hole on the side of this black collant box(expansion tank ??). the collant was spraying out of it.
so although the cap was sealed there was this small hole on the side. i dont know ow it happened but it did.
When you got that replaced did the whistling noise immediately go away?
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  #11  
Old 06-12-2010, 09:27 AM
jluu6r jluu6r is offline
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sounds like a similar problem i had. a low coolant alert popped up and i could smell radiator fluid. i poped open the hood and found a long straight hard hose on top of the radiator broke where it connected to the rubber hose that goes to the radiator fluid resivor. hard part was removing the clamp, which looks like it needs a special tool to put on and off.
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  #12  
Old 06-12-2010, 10:51 AM
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legend legend is offline
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Quote:
Originally Posted by rentsr View Post
When you got that replaced did the whistling noise immediately go away?
Yes, I think that noise was a result of this little hole and the steam and fluid gushing out of it.
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  #13  
Old 06-13-2010, 06:52 PM
washougal6 washougal6 is offline
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For what it's worth, I recently had the "low coolant" light pop up on my dash. I had to take it my car in for an oil change at my local shop anyway and had them check it out last Thursday.
Turns out there is a leak WAY in the back of the engine compartment on the passenger side. My car is a CPO,,, so I'm taking it to the dealership to have them check it out. I found out that CPO cars aren't covered for "hoses".. Something bigger, it's covered... I have an appt. at Rasmussen BMW this Tuesday to have them check it out and do the software update. I'll report back to this thread on Tuesday.
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  #14  
Old 06-14-2010, 03:09 PM
rentsr rentsr is offline
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I ended up replacing the hose myself, it no longer leaks and all of the unwanted noises disappeared. YAY!!!
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  #15  
Old 06-14-2010, 11:44 PM
rentsr rentsr is offline
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Uh oh a little too early for me too speak, a few noises have returned yet disappear after a few minutes of driving. ERRRGGHHH, i will investigate, any insights welcome.Thanks!
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  #16  
Old 06-15-2010, 07:08 AM
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Hossy Hossy is offline
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might be in multiple areas. pressure test is the best way to find out! at the same time, plug the hole you see is leaking, pressure test again - see if anything else is cracked or has a hole.
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  #17  
Old 06-15-2010, 07:26 AM
docpaulo docpaulo is offline
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rule of thumb in this situation is when one hose starts to leak, the rest should be replaced... the hoses were all placed under the same service conditions and were manufactured the same way... so if it's time for one to be replaced, the rest won't be far away....
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  #18  
Old 06-15-2010, 09:32 AM
dcabot dcabot is offline
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Take it in for service. You don't want to overheat the motor.
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  #19  
Old 06-15-2010, 11:05 AM
washougal6 washougal6 is offline
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Quote:
Originally Posted by docpaulo View Post
rule of thumb in this situation is when one hose starts to leak, the rest should be replaced... the hoses were all placed under the same service conditions and were manufactured the same way... so if it's time for one to be replaced, the rest won't be far away....
My car is down at the dealership as I type. I'm really curious to hear what is causing my coolant leak. It seems crazy that hoses aren't covered under my Certified Pre-Owned Status...
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Old 06-15-2010, 11:17 AM
washougal6 washougal6 is offline
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CRAP........... Just got a call from the dealership. There are 2 hoses in the back of the engine compartment (heater hoses?) that are leaking. NOT covered under the CPO.. $510. Uggggg....
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  #21  
Old 06-15-2010, 11:49 AM
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pablo645 pablo645 is offline
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Quote:
Originally Posted by washougal6 View Post
CRAP........... Just got a call from the dealership. There are 2 hoses in the back of the engine compartment (heater hoses?) that are leaking. NOT covered under the CPO.. $510. Uggggg....
Yep. Unfortunately CPO do not cover hoses except for the ones that are associated to the AC and Power steering. All others you will have to replace. If you have a good relationship with your service guys, they will usually try and make the cost less painful.
BMW used these high temp plastic pipes that I do not really believe in. Believe it or not, on my 540 I actaully replace a lot fo these plastic pipes with copper tubing and never ever had to worry about pipes and hoses getting busted. For guys with their cars out of warranty, you may want to look at outfitting some of these tubes and hoses with something a bit more rugged, especially if you are replacing one in an area that require a lot of work to get to.
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  #22  
Old 06-15-2010, 01:30 PM
rentsr rentsr is offline
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I checked everything over with the engine idling and i couldn't find any more leaks. Today i also refilled my coolant tank and the noises went away so i guess the noises were somehow related to running low on coolant. I plan on replacing the rest of my hoses this weekend as a precaution, i am also considering replacing the coolant tank as well just to be safe. It is an easy diy project (hoses to and from coolant reservoir) that i recommend if you haven't ever had them replaced just to avoid future headaches. Cost of coolant, clamps and hoses was under $25 and it takes just a few minutes.
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  #23  
Old 07-20-2010, 03:15 PM
Spot0814 Spot0814 is offline
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I had a similar problem and I'm not sure whether the Expansion Tank had a small crack or the Fan failed but both have been replaced along with a probable working thermostat. Car is still overheating after 20 to 30 mins and now I'm understanding from the forum that I probably have air bubbles in the coolant/engine. So from looking at other BMWs, they have bleed nuts, I can't find one on my 2005 645ci conv. So I'm guessing this is my process for bleeding the air bubbles out? Put car on incline to make radiator high as possible, turn car on, set temp to max hot, set fan to low, make sure A/C is off, remove expansion tank cap, fill to max, leave cap off, turn engine on, close cap if level doesn't decrease, refill and repeat? Let me know if anyone knows where I have a bleed nut or an official process how to bleed a 645Ci conv 2005 coolant system.
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  #24  
Old 07-29-2010, 12:56 PM
raydl12 raydl12 is offline
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Hi Rentsr, I am doing my research on 645i before buying one. Here is one of the Coolant Leakage on N62 engine. http://www.allgermanauto.com/product/index.html
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  #25  
Old 07-30-2010, 06:36 AM
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Giantsfan82 Giantsfan82 is offline
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I had the same EXACT problem. My coolant level low light came on, I filled it with coolant, three weeks later it came on again, I filled it again, then a week later the light came on again... But this time it was followed by the smell of coolant. Shortly after I heard the whistling noise, so I popped the hood and there was coolant just sprayed all over the place in the engine and on top of the inside of the hood. So I brought it to BMW, they said I had a bad hose. A day later and 160 bucks lighter I had my car back. The good thing about it was that they also found out that my radiator needed to be replaced. Now my AC is super cold. They also figured out why my key-less entry was so unreliable and they ordered a part for me that was covered under warranty. So if I were you I would bring it to them and have it looked at. Sometimes they find things that you didn't even know about and if you have a CPO warranty, all you have to do is pay the deductible and you're good to go.
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