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7 Series - E38 (1995 - 2001)

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  #1  
Old 10-09-2012, 03:34 PM
BEACH130 BEACH130 is offline
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Location: Connecticut
 
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Mein Auto: 740IL
740IL 1998 Overheating STILL

I brought my car to a mechanic because my check engine light was on and the car would not pass emissions. I had new oxygen sensors put on and then he had to do something with the intake valve or something and he reset the computer. Went to drive the 100 or so miles and on 97 miles the stupid light came on. Brought it back and he reset it and I drove 2 miles and it came back on. This time it showed the thermostat and sensor needed to be replaced. He replaced that last October and now it is not working again. I brought it back in so he could change that out AGAIN and he reset computer. Drove about 97 miles again in 2 days so I can get it to emissions. Got up in the morning and drove about 10 miles to a Dr. appt and on my way back decided to stop somewhere to see about doing emissions. They told me I should wait until I hit 120-150 miles to be sure. Great! Go about 2 miles down the road and my CHECK COOLANT TEMPERATURE is blinking red. I pulled in to a gas station about 200 feet away and coolant and steam was coming out everywhere. Needless to say, I had the car put on a flatbed and brought back to the mechanic to find out what happened. He called a day later and said I have a small hole in my radiator, which was only 2 yrs old.. Then when he went to take out the radiator he noticed the elbow or arm thing to radiator was cracked so he replaced that instead. Filled up the radiator and took it for a ride. When he got back he had it outside the shop idoling and big explosion came from the car. It was my expansion tank. Now all I wanted was the check engine light off. LOL!! It blew off wires and a few odds and ends but he put the new expansion tank on and put everything back together and now after 30 minutes of running the engine, it has too much pressure and he is afraid it will explode again. Now this mechanic has no clue what to do now. He said he did a gas test or something like that to see if it was the head gaskets but it was negative. Does anyone have a clue what is making all this pressure or what this guy is not doing. My car has been sitting there for almost 2 months and no car.. I can't drive my car out of there. He is a transmission specialist but he has always done odds and ends with no issues. I had no idea this was going to turn into this or I would have just bought a new car. The car was great before I brought it in to have the check engine light off. It has 214,000 miles on it and no problems. HELP..
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  #2  
Old 10-11-2012, 08:52 PM
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TerryY TerryY is offline
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Location: Woodland Washington
 
Join Date: Jul 2003
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Mein Auto: BMW '95 840
BMW's V8 expansion tanks blow up virtually by themselves after proper aging. The version of tank used in your car is very good at it. It has been used since the 1991 8 series.

If it had a black top and yellow bottom they were a time bomb waiting to happen. The all black tanks last longer but some of those have popped their sides as well.

If it isn't leaking anymore and passes the head gasket test it should be good to go once all of the air is bled from the system.
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  #3  
Old 10-12-2012, 04:01 AM
BEACH130 BEACH130 is offline
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Location: Connecticut
 
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Mein Auto: 740IL
Thanks. This guy will try anything but he didn't know where to start. I dropped off some instructions for bleeding this car. First I knew he did not put my car up at an angle to do it, so figured it wouldn't hurt to print out the instructions I found off this start. It sounds like this car needs to be done in a certain way. I'm hoping this will be it. I went back and thought of the last thing done to the car before the overheating began. He replaced the Thermostat and sensor. He recently checked the Thermostat and that is working. I was worried after everything else overheated that it could be almost anything. The car was driving perfect until I brought it in to get the check engine light off for emissions. I only want to get another 6 mos. and I'll be happy. Thanks again. I'll let you know how it goes.
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  #4  
Old 10-12-2012, 09:35 PM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,144
Mein Auto: E23;E30;E38;E32;E34 +
Hate to be a ratbag but maybe he should stick to transmissions. Sounds like he is out of his depth. Get it to a good local indy (or stealer if you would prefer) and let a specialist go over it.
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E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #5  
Old 10-13-2012, 04:49 AM
BEACH130 BEACH130 is offline
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Location: Connecticut
 
Join Date: Oct 2012
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If I knew I had more than check engine light to come off, I would have brought it elsewhere. It was one thing that broke something else and then something else goes. I can't drive it at the moment because it overheats within 15 minutes. He was going to try to follow bleeding instructions and see what happens. If that doesn't work, I will drive it to a few foreign car mechanics down the street. It was just a check engine light and thought it should have been an easy fix. Ha-Ha!! Love the car and never had any issues with it until someone replaced my radiator a couple of years ago. Always lost a little coolant.Thanks for your thoughts.
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  #6  
Old 10-20-2012, 09:28 PM
technoben.1 technoben.1 is offline
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Location: **********,In
 
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Mein Auto: bmw 323i
I'm not for sure if your expansion tank is like the one I have but I do know allot of people have had problems with coolant leaks and intermittent leaks due to the temp of the car. I just replaced my whole cooling system at 150,000 miles because of over heating and leaking. What i found was a very complicated and intertwined system for engine cooling, steering cooling and transmission cooling. BMW has a series of thermostats on their system and the one I think your problem is...... in the expansion tank. Besides the thermostat on the block that has a sensor in it the on in the expansion tank allows the coolant to warm up before sending it to your heater core. Sometimes this one gets jarred in the tank and due to plastic fatigues and heat it gets stuck closed. Removal of this tank is very easy and can be out to inspect with the removal of two hoses that have the BMW quick connect adapters. It is in the bottom of the tank and can be replaced. What I can caution you is that I have never seen a system that relies so much on o-rings and the tapering of the connections, so be very clean and attentive to the seals. Like I had mentioned I replaced everything from the radiator, hoses, belts, radiator cap, thermostat, and the water pump with all new o-rings and gaskets. All and all I had a whole new system for 800.00 dollars. Hope this helps and I have had no problems at all, runs brand new.
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  #7  
Old 10-21-2012, 11:32 AM
BEACH130 BEACH130 is offline
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Location: Connecticut
 
Join Date: Oct 2012
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Mein Auto: 740IL
Thanks for the info. He just decided that the clutch fan was not working and found some switch and said the electric fan isn't work. Something about it will work on high but not on low so he is throwing it together good enough so I can drive to dealership and trade in for a new car. Makes me mad that I spent over $800 for something in the intake that came up for emissions, then thermostat shows up so he replaces that and some other sensors too. NOW I drive and my car overheats and blows out coolant everywhere. First thought it was radiator but then says elbow to radiator cracked. Fixed that and took for test drive and then the expansion tanks exploded so I bought a new expansion tank, some wiring, pigtails and still overheating. Gave him directions because it stated it could be that he wasn't bleeding it correctly and to check clutch fan. He said clutch fan was fine but when I gave him list and told him to check with piece of paper. It didn't cut the paper, so he puts in a new clutch fan. Now he tells me after he put in the new clutch fan, he said the electric fan was not working but he is doing something so I can drive to dealership without overheating. I'm so mad because I have not put in $2000 into the car. Just put on new brake pads, rotors, 4 new oxygen sensors, radiator only 2 years all, new hoses and all these new parts and I could have gotten $2000 for trade in without doing any of this crap. It is still overheating but he insisted that the head gaskets are not shot. I love this car and it drove great 214,000 miles. I even changed the fluid in the rear end of the car last year and bearings aroung the u joint. Dealership said they will give me $2000 for trade in. It is sick to pay all this money down the drain. Car is in excellent condition other than that. Thanks again, but I'm done...
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  #8  
Old 10-21-2012, 04:34 PM
chrisn7 chrisn7 is offline
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Location: Huddersfield, West Yorks
 
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I think your problems now are due to your mechanic not understanding the bleed procedure. Even if you think you have done it right, you have to check the coolant level every day for 3/4 days after-its atonishing how much air gets trapped in the system. The auxilliary fan could be faulty, but may be ok: its primary function is to cool the air con refridgerant, and its secondary function is to provide additional cooling to that provided by the clutch controlled fan, dependant on coolant temperature. It is not tested just by applying 12v to it, which is probably what your man did...Change mechanic not the car!
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  #9  
Old 10-21-2012, 05:00 PM
BEACH130 BEACH130 is offline
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Location: Connecticut
 
Join Date: Oct 2012
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Mein Auto: 740IL
Thanks for the information. I agree about the mechanic but I had no way to get the car out of there because it would overheat too quickly. I just don't want to put another $500 into it and then find out it is something else. The car was working well until the Thermostat change. Then all hell broke loose. He did say the electric fan was not working but more $$$. I need something reliable, so time to get something that gets MUCH better gas mileage. LOL! I wish I had it towed to another shop after it overheated the first time but I figured it was something he did and wanted him to fix it. Can't prove anything at this point.
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  #10  
Old 10-22-2012, 07:02 PM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,144
Mein Auto: E23;E30;E38;E32;E34 +
Car change over won't be cheap. $2k trade? I'd buy it and ship out here at that sort of money! Keep car; find GOOD mechanic.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #11  
Old 10-23-2012, 03:33 AM
BEACH130 BEACH130 is offline
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Location: Connecticut
 
Join Date: Oct 2012
Posts: 6
Mein Auto: 740IL
I'm on the road all day for my work. The mileage kills me at this point and not being reliable is not good. I'm actually picking it up today and tomorrow to pay this mechanic the last bill of about $500-$700 and driving it over to the dealer. They will give me a $2000 trade it. Hell, they can sell all the new parts I just put in. Hope I make it without it overheating. No fancy cars this time, just an everyday higher mileage work car for now.
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