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General E46 Forum
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Old 07-27-2015, 09:11 AM   #21
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There is a plastic water pipe under the intake that connects to a rubber hose which connects to the heater control valve.


Remove your under shield, warm your car up. Jack up your car and see where it may leaking.

There is also a temperature sensor under the intake at the back. Have not heard of any leaking.

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Old 07-27-2015, 09:13 AM   #22
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Is it hard to see the pipes under the intake?
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Old 07-27-2015, 09:16 AM   #23
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http://www.realoem.com/bmw/enUS/show...diagId=17_0215

That diagram might help. Could be #5, which is a rubber hose that connects to the side of your expansion tank or #6, which is an aluminum hose. #6 is back by the firewall, in the middle of the car. #5 connects to the firewall near the driver's side. Try taking both skid plates off, if you haven't, otherwise it could be pooling in one spot and leaking from another spot.
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Old 07-27-2015, 09:29 AM   #24
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Originally Posted by Thate46Life View Post
I'll replace the o ring but I do not think it is that as my heater and ac do not work now and my heater hasn't worked since I got this leak and I don't see the little o ring on my temp sensor doing all that.
Heater probably does not work because there is air in the cooling system.,

AC not working, probably not related unless low on Freon or an electrical problem.

O-ring in lower radiator hose connection usually only leaks when the engine is cool and sometimes will not even leave a puddle on the ground as it leaks on top of the lower engine cover, if it does leak on the ground, it can leak on the other side depending on how level the car is parked.

It could very well be the plastic coolant pipes under the intake, but the the O-ring is a 10 minute, $3 job and then refill and bleed coolant system and see what happens.

Or you can spend an hour or more tearing apart the car looking for a leak under the intake.
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Old 07-27-2015, 09:30 AM   #25
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On my car the return hose (#5) goes into some kind of valve if I remember correctly.
When I get home I'll take a photo of the valve.
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Old 07-27-2015, 09:34 AM   #26
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I'm going to replace the temp sensor o ring for good measure. But I highly dough it's the actual problem. My heater has a sweet smell like if your heater core is broken, but I don't have any leaks in the car.
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Old 07-27-2015, 01:23 PM   #27
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Is it hard to see the pipes under the intake?
Yes, but it ends near the firewall and connects to a rubber hose that turns to the front and connects to the HCV.

Just trying to give you some real life suggestions. Based on where you say the leak is, it could be coming from that area.


It certainly could be leaking there rather than the sensor o ring.

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Old 07-28-2015, 01:42 AM   #28
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Could it be the HCV? Tomorrow morning I'm gonna take off the intake box and have a look and go from there. I'll also take a photo of the plastic valve that I found under there. I found a video on YouTube of how to replace the part I think your talking about.
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Old 07-28-2015, 01:43 AM   #29
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Here's the video I found.

Last edited by Thate46Life; 07-28-2015 at 01:44 AM.
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