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Discussion Starter #1
Ok. What is the deal with the coolant leak at the thermostat housing? I have replaced the housing, thermostat and the gasket plus put a screw clamp on the inlet hose and it still leaks. It is not wet but has the trail of residue on it and droplets on the front cross member. I really do not know what else to do. Any suggestions?
 

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Comfortably Numb
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Have you checked the hose? If you're still running the same hose on an 07 there's a chance there is a pinhole leak in the bend area. Pics would be helpful.
 

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Random Dude
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^^^ what he said, plus:

Maybe this is a dumb question, but are you sure it's coming from the thermostat housing?
Have you traced it up the block all the way to that point?
Could be coming from the weep hole in a water pump that's starting to shit the bed.

X2 on RubiCajun's request for pics - we jump on pics like a crackhead on a spilled bottle of Vicodin. :bounce:
 

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Discussion Starter #4
The residue is at the thermostat housing on top down the side of the intake and over the head. Not a bunch but enough to create the residue and a small wet line over the left head. I will try to get a picture tomorrow.
 

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Comfortably Numb
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I may be wrong but I seem to remember something about the 07's having a poor casting problem with pinholes/porosity and coolant leaking through the metal due to pressure/high temperature. Clean off completely all of the residue you see, sand the area down to shiny metal and check again in about a week. Of course I do have Stage 4 SleauxHeimers.:gluging:
 

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Discussion Starter #6 (Edited)
here are some pics. Do they help any? See anything?
 

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If the thermostat housing is plastic head to the dealer and get anew one. I know BMW had a lot of issues with thermostat housings in the early 2k's they switched to plastic and you could never get them to properly reseal. Toying around we figured out the housing was the exact same as the metal one previously used just made out of plastic. we offered the customers the choice of getting a metal one installed or by a new plastic one every time it had anything done with the cooling system.

I am thinking BMW caught on to what we were doing as they installed an electrical switch in to later models forcing us to use plastic ones all of the time.
 

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Discussion Starter #8 (Edited)
No special reason I took that 2nd shot but in the picture it looks like it is leaking from them 2 holes, I dont think it is but? Thats why I replaced the housing in the first place because I thought maybe it had a small pinhole in it but this one is still leaking somewhere. They are still plastic though right?
 

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It appears it uses an O-ring. Are you putting sealant on that oring? If so get a new one clean up the housing and put a thin smear of bearing grease around the oring and walk the housing down slowly and evenly.
 
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