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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Wed, Dec-19-2018, 03:14:07 PM   #1
SQ13
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Default Coolant Leak Behind Motor. Need Advice.

My E36 has experienced a major coolant leak thatís coming from behind the motor. Initially I thought that one of the three lines that attach to the heater core was loose, but I got a chance to get in there and tighten the hose clamps. I see that two of those lines go to the heater control valve; those are fine. But the third line Iím guessing goes to the motor? Now, after letting the car idle for about 10 mins (I guess when the fluid is warmed up and system is pressurized), hissing and coolant vapors originate from the third line, under the intake.

I was wondering if there is easy access to this hose with the intake removed. Removing the E46 M3 intake is a PITA...how bad is removal of the E36 M3 intake? If it turns out to be that hose, should I go ahead and replace it as well as all of the other coolant lines back there? They all look original.





So far, Iíve removed this part, so I have a good visual on all of the lines except the other end of the third hose.


I think itís this line?
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Old Wed, Dec-19-2018, 03:18:21 PM   #2
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Default Re: Coolant Leak Behind Motor. Need Advice.

Intake manifold removal isn't too difficult but it is time consuming. You'll definitely need to remove it to fix the issue you're having.
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Old Wed, Dec-19-2018, 03:27:48 PM   #3
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Default Re: Coolant Leak Behind Motor. Need Advice.

If you think removing the E46 M3 plenum is hard (it is not at ALL), you'll hate doing the E36. It is by far harder to remove.
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Old Wed, Dec-19-2018, 03:28:48 PM   #4
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Default Re: Coolant Leak Behind Motor. Need Advice.

I'd replace all the water hoses back there while you are in there. You don't want to have to go back in. I replaced all mine and the clamps (BMW OEM clamps) as well. Once the manifold is out everything is pretty accessible.
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Old Wed, Dec-19-2018, 04:08:07 PM   #5
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Default Re: Coolant Leak Behind Motor. Need Advice.

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Originally Posted by JitteryJoe View Post
I'd replace all the water hoses back there while you are in there. You don't want to have to go back in. I replaced all mine and the clamps (BMW OEM clamps) as well. Once the manifold is out everything is pretty accessible.
Include throttle body coolant hoses and the dual orings on the hardline that is under there.
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Old Wed, Dec-19-2018, 04:25:44 PM   #6
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Default Re: Coolant Leak Behind Motor. Need Advice.

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Originally Posted by Braymond141 View Post
If you think removing the E46 M3 plenum is hard (it is not at ALL), you'll hate doing the E36. It is by far harder to remove.
Not hard, just literally a pain in the ass trying to shove hand into tight spaces and leaning over engine bay for a long time especially when trying to loosen a couple of hard to access throttle body clamps. My hand is still bruised from cleaning ICV three weeks ago. Canít wait to remove the E36ís...

Quote:
Originally Posted by JitteryJoe View Post
I'd replace all the water hoses back there while you are in there. You don't want to have to go back in. I replaced all mine and the clamps (BMW OEM clamps) as well. Once the manifold is out everything is pretty accessible.
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Originally Posted by Braymond141 View Post
Include throttle body coolant hoses and the dual orings on the hardline that is under there.
Cool. Iíll take a look at whatís back there once the manifold is out. Iíll follow up in this thread if I canít figure out PNs for specific parts.
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Old Wed, Dec-19-2018, 11:54:42 PM   #7
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Default Re: Coolant Leak Behind Motor. Need Advice.

I would not take the manifold off for that personally. I would get it from underneath.
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Old Thu, Dec-20-2018, 02:54:29 AM   #8
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Default Re: Coolant Leak Behind Motor. Need Advice.

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I would not take the manifold off for that personally. I would get it from underneath.
Are the lines easily accessible from below? Iíd be working with the car on jack stands
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Old Thu, Dec-20-2018, 04:06:40 AM   #9
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Default Re: Coolant Leak Behind Motor. Need Advice.

The factory clocking of the block side hose clamp is up. You will need to access it from above. I can’t picture how easy the job as whole will be from underneath.
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Old Thu, Dec-20-2018, 02:41:07 PM   #10
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Default Re: Coolant Leak Behind Motor. Need Advice.

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Originally Posted by Braymond141 View Post
The factory clocking of the block side hose clamp is up. You will need to access it from above. I can’t picture how easy the job as whole will be from underneath.
i agree it won't be easy and will result in scraped arms but i'd do that over pulling the intake, replacing gaskets and praying for no vacuum leaks at the end of it.

Another idea is to get an M50 manifold and swap it in at the same time. Upgrade and maintenance at the same time!
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Discussing Coolant Leak Behind Motor. Need Advice. in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)