PLEASE help locate antifreeze leak..

[beamerrules]

Hi, I'm new to this board and to the 740il. I just got this car and love it so far. Today after installing some denso plugs I took it for a FAST test drive which the car performed very very well. But afterwards I turnred off the car and noticed some antifreeze leaking from the bottom of the car. I had lifted the hood and heard a "hizzing" noise (like when there is a hole on a hose) and aferward is when I looked down and so the leak comming down.

The leak is near the back of the engine which to me is weird since most of the leaks from other cars I have had always were in the front. Any idea where this leak is comming from? What I need to replace?

Thanks for any help you guys can give. I hope it's nothing big.

[beamerrules]

Come on people I know you guys must have some clue,please.

[BAVARIANM]

It's not that nobody wants to help you, but there are quite a few possibilities for leakage from the rear of the engine. The coolant hoses that run to the housing on the rear of block, the auxillary water pump/heater valve assy, the plate on the top of the block under the intake etc..... Some information from you is required. We don't have a crystal ball.

[beamerrules]

Thx for your reply which was very helpful. At least now I have an idea as to what it may be. The crystal ball comment was not really necessary, I was not trying to be rude. I tried to give all the information I had. If more info is needed all you guys need to do is ask and I will do whatever it takes to get that info.

Thanks for posting.

[Bear]

What year 740. I woiuld start by looking at the expansion tank (the plastic coolant holding tank on firewall at rear of engine). There is probably (based on year) a large hose coming off of the bottom of this tank on drivers side, and the hose clamp my be loose or the hose split or the tank split at the hose attachme4nt (on my 1988 750 there was a metal sleeve in the tank outlet and the outlet had a crack and allowed the sleeve to slip toward outlet and I could not tighten hose clamp on the sleeve. I took tank off and tapped the sleeve back upstream and was able to reconnect and tighten the hose clamp). New tank is about $40.00. The outlet hose is "T" shaped and goes down behind the engine block and then tees off to the pasenger side and to the auxilary heater valve (the plastic cover next to the B+ jumper post on drivers side). Lift the cover off and look for a leak on hoses off of the aux heater valve and to the firewall to heater core, I had several leaks on thes hoses and ended up replacing all of the heater hoses which is a beach on the V12.

[Grettahouse]

Get yourself a small inspection mirror and a flashlight and start probing around the back of the engine, check all connections.
Let us know what you see.

[beamerrules]

Thx bear and grettahouse! The year is 1995,I will try the mirror idea in the morning and let you guys know what I find. It will be great if it's just a craked hose!

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[beamerrules]

Ok, I found the hose that is leaking. It's the rear top left hose that is mounted to the block. It seems to go to the driver (right side as you stand in front of car) and down. I need to lift the car to be able to see the other end of the hose. But for now I need to get a part number so I can order it from the net.

Does anyone know where i can see a picture of the back of the engine with the hoses hooked up. Or does anyone know what hose this would be? I cannot go to the dealer as it's to far away and the leak has gotten very bad.

Any help is GREATLY APPRICIATED.

[Bear]

OK, go to www.realoem.com/bmw
Then go to parts lookup and select your series and build date, after that go to lookup parts and select engine, in the pull down menu select engine cooling, find the picture with your hoses and click on it to expand it, and see if your hose is there (the menu will also have the part number for the hose).

Good luck.

[beamerrules]

Thx Bear!

[beamerrules]

Finally fixed the water house and no more leaks. I did it myself and saved $109.00 that pep boys wanted to charge me. Thanks everyone!

I have one last question for this thread. Where is my cooling sensor and air sensor in this 95 740iL?

[Bear]

Great news. Now, if you used the realoemparts website, go back to that and engine cooling and hose and pipes, you will see the two sensors that you mentioned, both are in the back of the engine at firewall and on passenger side. OBC temp sensor is in the front lower fascia either on drivers or passenger side and next to the fog light.

[beamerrules]

Many thanks Bear! I have to ask you guys what MPG are you getting? When I first bought the car the computer told me 7.3 MPG. I changed the plugs to denso's and now it say 9.3. This is the only thing I'm not liking about this car.

I filled the tanm up with premium gas and now it's close to half tank with only 69 miles! I drive this car pretty slow so it's not the way I drive. Is this normal for a 1995 mbw 740iL with 123,000 miles? Please say no.

Btw, the previous owner put in a K&N filter, does this waste gas more than the regular air filters?

Thx.

[Bear]

The only experience I have is with a 1988 750 and that MPG was 14.0 city and 20.5 highway (at 75 MPH). K&N should not affect MPG, how are the 02 sensors?

[beamerrules]

"how are the 02 sensors"

I have no idea, how can I trest them? Also, does short distance driving affect fule economy? I hardly drive long distances, short stop and go I do alot of.

Thanks for the help!