BMW

BMW Questions? Ask a BMW Repair Expert for Answers.

Ask an Expert,
Get an Answer ASAP!

BMW

My 99 740 IL has a check coolant level error message coming

Customer Question
on. At first the...
My 99 740 IL has a check coolant level error message coming on. At first the message came on every 3 - 4 months and I topped off the tank. The message started occurring every month or so and the BMW dealership did a pressure test which they claimed showed a leak in a hose connection. Within a month the error message occurred again, the BMW dealer did another pressure test and stated the pressure test was normal but that I needed to replace my expansion tank. The dealership claimed the expansion tank was cracked internally and when I questioned them they stated that the expansion tank was cracked internally but it was not a through and through crack and that was why the pressure test was normal. I asked them why the system was slowly losing fluid and they made up some non-sensical reason. I went to an honest local mechanic and purchased an OEM expansion tank manufactured by Behr and had it replaced. The error message continued to come on every month or so along with the need to add about 4 - 6 ounces of fluid. The check coolant error message now goes off daily and within minutes of filling up the expansion tank and watching the plastic bobber go up. A repeat pressure test 4 times since it has gotten worse has been negative. I am going to ask the mechanic to fill the tank after it is cool and start the engine while the car is on the rack and see if he can determine where the fluid is going.
I have recently seen a bit of fluid on the garage floor but I can not be certain if the fluid is due to a leak or my poor aim in getting all of the fluid I add into the expansion tank.
Thanks,
Al
Submitted: 23 days ago.Category: BMW
Show More
Show Less
Ask Your Own BMW Question
Answered in 12 minutes by:
11/20/2017
BMW Mechanic: Steve, BMW Expert replied 23 days ago
Steve
Steve, BMW Expert
Category: BMW
Satisfied Customers: 24,415
Experience: BMW Expert
Verified
hi, how can I help you with this? what was your question specifically?
Ask Your Own BMW Question
Customer reply replied 23 days ago
As per my history above, the system is losing fluid somewhere but all pressure tests have been normal and no evidence of a cracked head. The expansion tnk has been replaced and the problem is getting worse.
BMW Mechanic: Steve, BMW Expert replied 23 days ago

Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you

if there was coolant on the garage floor and it wasn't from you refilling it, then there is definitely a leak. However, since we dont know if this was a spill, it isnt concrete.

the coolant can only be leaking or being consumed by the engine.

I would recommend the following:

pressure test with vehicle raised and underbody panels removed. increase pressure slightly higher than normal then yank on all hoses and connections. also check head gasket for any signs of coolant seepage after this test.

from there, a leakdown test and chemical cylinder head gasket test carried out.

this will reveal if the engine is consuming the coolant (bad head gasket, cracked head, cracked block) or if there is a very tricky leak

if you need a good non dealer option to cut down on costs, check out www.bimmershops.com or www.bimrs.org for options.

Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.

Ask Your Own BMW Question
Ask Steve Your Own Question
Steve
Steve
Steve, BMW Expert
Category: BMW
Satisfied Customers: 24,415
24,415 Satisfied Customers
Experience: BMW Expert

Steve is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

Roger

Roger

BMW Master Tech

3,050 satisfied customers

10 yrs. experience as BMW Master Technician, shop foreman and dealer.

Marty

Marty

ASE Certified Technician

509 satisfied customers

ASE & Bosch Certified Master Tech. Over 30 years experience.

bimmaster

bimmaster

BMW Technician

1,838 satisfied customers

3 years dealer experience, master bmw tech

Sam

Sam

BMW Master technician

1,043 satisfied customers

BMW S.T.E.P. graduate, 10 years BMW dealership experience

Thebmwbum

Thebmwbum

BMW Foreman

714 satisfied customers

31 years BMW Experience

mike

mike

BMW Technician

694 satisfied customers

bmw master tech ase certified

Matt

Matt

Engineer

419 satisfied customers

Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing

< Previous | Next >

Related BMW Questions
Engine light came on and fan won't shut off for 5-10
Engine light came on and fan won't shut off for 5-10 minutes. Code says misfire on cylinder 1. I replaced the plugs . Same problem … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
2008 bmw 335i engine fault light comes on without fault.
2008 bmw 335i engine fault light comes on without fault … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Ive got a 2011 335 xi coupe manual 6spd and the check engine
Ive got a 2011 335 xi coupe manual 6spd and the check engine light came on with a reduced power warning. ANy idea what this could be? … read more
internal88
internal88
Product Manger
Bachelor's Degree
623 satisfied customers
95 e34 my engine just running rough of acceleration, like a
95 e34 my engine just running rough of acceleration, like a cylinder is missing. Engine feels wobbly. I need to check my coils and plugs, but was seeing if anything else i need to test. … read more
Steve
Steve
BMW Expert
24,415 satisfied customers
E46 1999 318i 1895cc engine surge on tickover,failed mot
e46 1999 318i 1895cc engine surge on tickover,failed mot mixture too weak,suspect sucking air on inlet manifold.However i have replaced inlet manifold gaskets and injector O rings but engine still has… read more
GEORGEBMW1
GEORGEBMW1
Auto Repair Shop Owner
Virgina Automotive Technical Instit
61 satisfied customers
Often the half engine light comes on. When this occurs the
Often the half engine light comes on. When this occurs the engine runs badly and will barely pull the car.......2014 mini cooper convertable … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,108 satisfied customers
2003 745Li - Engine Malfunction, Reduced Power fault.
2003 745Li - Engine Malfunction, Reduced Power fault … read more
rpmdiag
rpmdiag
High school
7,169 satisfied customers
Service Engine Soon light on.Paid for Vanos solenoids
Service Engine Soon light on.Paid for Vanos solenoids replacement. … read more
Michael Solis
Michael Solis
307 satisfied customers
The mechanic asked for the engine seize and mileage covered
the mechanic asked for the engine seize and mileage covered which I have provided without a response. He said he tried calling me without going through. So he can reply by writing … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,108 satisfied customers
Engine oil doesnot come the the camshaft and case resulting
Engine oil doesnot come the the camshaft and case resulting to seizure of the camshaft. After replacing the case and camshaft, we started it and the engine seized and would not start again. Do I need … read more
Gunvir Singh
Gunvir Singh
1,799 satisfied customers
Engine cranks but no fire after changing spark pluugs.
Engine cranks but no fire after changing spark pluugs … read more
Steve
Steve
BMW Expert
24,415 satisfied customers
Service engine soon light is on. 2004 325ci. The mechanic
the mechanic previously said it might be the gas valve that he installed … read more
Steve
Steve
BMW Expert
24,415 satisfied customers
I just had a engin installed, but now the Windows will not
I just had a engin installed, but now the Windows will not go up or down. … read more
Steve
Steve
BMW Expert
24,415 satisfied customers
Engine Warning light,,,yellow engine outline...book says
Engine Warning light,,,yellow engine outline...book says "MIP"...runs rough on restart...Switched out gas filler cap...sometimes after fill up the light goes out....new cap not a fix...vacuum leak? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a check engine light on. They diagnosed it as Exhaust
Hello, i have a check engine light on. They diagnosed it as Exhaust Vanos Mechanism Fault 2A87 … read more
Gunvir Singh
Gunvir Singh
1,799 satisfied customers
Check engine light came on, when engine turned off
check engine light came on, when engine turned off "trans-fail safe" indicator...cleared same day... … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,108 satisfied customers
Engine starts but runs rough, engine starts but runs rough,
engine starts but runs rough JA: Will the headlights turn on? Is the battery fully charged? Customer: engine starts but runs rough JA: What is the model/year of your BMW? Customer: 535i 1985 JA: Are y… read more
Steve
Steve
BMW Expert
24,415 satisfied customers
Engine error: drive moderately engine overload. No tool or
Engine error: drive moderately engine overload JA: How many miles are on the car? Do you have scan tool or a code reader? Customer: No tool or code reader 230,00p JA: What is the model/year of your BM… read more
Steve
Steve
BMW Expert
24,415 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x