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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 07-15-2014, 02:43 PM   #1
fungunns
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Location: Charleston, Sc
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My Ride: 05 330I
Overheating 05 330i

The car has a 3month old water pump. I have never changed the expansion tank.

The car had the yellow coolant light on. I added distilled water to it and it would go off. I did this for a month or so. Just yesterday I parked the car at my job and when I got out I noticed ti just started oozing coolant underneath... Would the expansion tank give these symptoms? I filled it again with water and had to get it home. It would go a mile and then climb in temp. I'd pull over and let it sit and fill it up again. Any ideas?
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Old 07-15-2014, 03:05 PM   #2
daniel_f.
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search the leak?
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Old 07-15-2014, 03:09 PM   #3
fungunns
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I am not sure how that answers my question? I know they are prone to problems but can the expansion tank be my culprit
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Old 07-15-2014, 03:13 PM   #4
daniel_f.
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Well, it can crack as you may see in the photo i had attached and cracked tanks tend to leak...

Why donīt you just take a look?
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Old 07-15-2014, 03:18 PM   #5
Tangent_
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Quote:
Originally Posted by fungunns View Post
I am not sure how that answers my question? I know they are prone to problems but can the expansion tank be my culprit
The culprit could be absolutely any part that coolant flows through. So yes, it could be the expansion tank, but it could also be the radiator inlet hose, the radiator, the radiator outlet hose, a heater hose, the coolant pipe on the block, the thermostat, the o-ring around the coolant temperature sensor, the water pump, etc, etc... You need to actually search for where the leak is like daniel_f suggested.
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Old 07-15-2014, 03:20 PM   #6
fungunns
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when you had to change yours did your car attempt to overheat?
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Old 07-15-2014, 03:29 PM   #7
daniel_f.
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I was in a parking lot, the engine idled and i was opening the top when i heard a quiet "blop". thats when the tank cracked. i noticed to late that the coolant temp was ~130°C. i stopped the engine immediately, but it was to late and the engine lost all its coolant. after being towed back home i ripped the cooling circuit off to search the leak and i was lucky i found it directly.

i changed the tank, the sensor and the 2bar regulator to 1,4bar unit and payed 68€
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Old 07-21-2014, 07:44 PM   #8
fungunns
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Ok, I have searched the leak. I did find an issue with the expansion tank. I replaced the tank... Bled the system as a search result had stated. The car still wanted to get hot... Next I thought... it had to be a water pump issue... Thats the last thing that was a culprit. I bought and replaced it as well... Same result.. it overheated again... I bled and bled the system... Next I replaced the thermostat... I just did that and bled the system... same thing... overheating. Maybe I am missing something here... WTF.

I realize this is a dead horse here on the forum but it is alive and well in my household... If anyone has anything to add please do. I have used the "search" multiple times... Again, maybe there is something I am overlooking... Also, the electric fan is running great.. It is an automatic
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Old 07-22-2014, 12:49 PM   #9
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How are you bleeding the system? I've found that it's damn near impossible to bleed properly without elevating the front of the car at least a little bit. I use ramps for this. Don't forget to turn your climate control to full hot and the temp wheel between the vents to full hot as well.

If it really is bled correctly, and you find no leaks, check what kind of flow you're getting through the radiator, it's possible it's clogged with scale and gunk build-up.
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Old 07-27-2014, 10:25 PM   #10
mapster37
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Make sure u are bleeding it with the cap off. keep rpm's around 2500. Loosen the bleeder screw until only coolant emerges. Then tighten down....do not over tighten it's only plastic! adjust coolant level as necessary. If u see a guiser u know the head gasket is blown..

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Old 08-22-2014, 11:37 PM   #11
glhx
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I did one the other day.
I did a full flush.....radiator and the bottom side of the engine.

I also replaced the
Water pump.....beyond shot....he was lucky
Thermostat
Fan clutch......omg.....wanna talk about shot
Upper and lower hose.
All idler pulleys
But....not the radiator.....and he's at 170k on original stuff.

Anyway...

Bleeding it.
I opened the bleeder. When you do this the coolant you pour in, pushes air out of the bleeder
I poured coolant in the expansion tank
Turned car on and let it warm up......watching temp with inpa software.
Thermostat opened
Poured more coolant
Let car idle till it hit 96c

When temp shot beyond that I opened bleeder and released air.
When air came out I filled it back up with coolant.

Drove the car 10 miles.....coolant light came on.....went out and bled air out and filled it all the way back up.

Over filled the tank,,,,,used bleeder to get extra fluid out of the tank

Had heater on full to90° and fan on so the heater doors were open the whole time.

Used a motive pressure bleeder with coolant pressure checker adapter to check for leaks......no leaks
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Old 08-29-2014, 01:01 AM   #12
MrDrCr
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I had the same issue. Fan clutch went out and warped block and head. Time for a new engine.



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