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General E46 Forum
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Old 01-25-2012, 07:55 AM   #1
ryanmyo
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severe coolant leak after air con service

My e46 just had an air con service and brake booster replaced on monday and yesterday (tues) arvo my coolant light flashed on.

Put 700ml water in expansion tank before driving to work for a few hours and back today, checked it after and it needed another 800ml. Drove to a mates 1km away and check it a few hours later before starting it, and it needs fluid again! god dam it.

Any ideas about if the shop may have screwed with my system?
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Old 01-25-2012, 08:08 AM   #2
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They may have, but don't assume it was intentional. I'm not sure on your car, but depending on what all you had done, something may have been removed and either not replaced or not replaced properly.

I'm not sure what they might have touched on the cooling system...but it may be that in order to replace the compressor, the radiator needs to come out to get space to do that, but I'm not sure.

Clean things up and look for leaks...both when car is off and on. Fill only to max...safest to stay between min and max...when the car is cold and on level ground.

Many vids here about the cooling system! See Bimmersgarage...he's one of the best with cooling!
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Old 01-25-2012, 08:08 AM   #3
jasonbimmer
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ask the shop. we dont know what did the shop do. check your expansion tank if there's cracks also the coolant temp sensor since its on the driver side (australia).
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Old 01-25-2012, 08:12 AM   #4
ryanmyo
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thanks, i did notice some dried coolant sprayed around the areas near the expansion tank cap, havent delved any further though
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Old 01-25-2012, 08:16 AM   #5
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Delve further very soon!

If it gets worse when driving and you overheat...

Pull over right away no matter where you are.

Turn key to pos 2 (car off) and turn fan on high, heat on high, and 3 red dots. Open window if you get too warm.

Get the car towed...

Monitor temp gauge. Failure to do so can result in head gasket/head/engine failure...aka $$$$$$
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Old 01-25-2012, 05:55 PM   #6
ryanmyo
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Delved further and found the problem, the air bleeder screw broke in half! bloody plastic parts. Il try and follow the DIY fix on here, thanks for your help guys.
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