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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 04-17-2007, 11:09 AM   #1 (permalink)
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air induction cone install

hey, just installed an air induction cone to my bmw 325i and everything fine. problem is though i took 2 hoses off the previous stock air filter unit, which i'm assuming is connected to the water cooling system. bit baffled to why the water cooling would be connected to the air filter, but my car has now overheated twice, so hopefully someone who has done this to a 325i or knows about this can help.

many thanks for any advice
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Old 04-17-2007, 08:39 PM   #2 (permalink)
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When you say "air induction cone", you mean you eliminated the old paper air filter box and replaced it with a cold air induction system with a cone filter on the end of it, right?....I'll assume that's the case...

Same thing happened to me. When I disconnected the hoses from the stock air filter unit I too was surprised to find coolant pouring out and also wondered what the coolant system has to do with the air induction system. After I hooked everything back up I also had an overheating episode. Disconnecting and reconnecting the coolant hoses from this sensor in the air intake path placed a sizable "air pocket" in my coolant system. Air pockets don't allow the cooling system to keep the engine cool.

Bleed the air from your cooling system using the bleeder screw on the top of your overflow tank (just to the right of the cap). Keep bleeding til there's no bubbles coming out, just coolant. Then shut the screw and you should be fine.
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Old 04-17-2007, 08:42 PM   #3 (permalink)
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pics plz
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Old 04-17-2007, 10:41 PM   #4 (permalink)
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there is a sensor attatched to your airbox, it's called the intake air temperature sensor, those two hoses you pulled off attatch to that sensor, the sensor is there to see if the throttle body should be heated during cold starts, you don't need it, find a place to zip tie the sensor and hoses out of the way, you're going to want to attatch the hoses back to the sensor first though, once you do that bleed the system and you should be good to go
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Old 04-18-2007, 12:39 AM   #5 (permalink)
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Originally Posted by SHAHAB323IS
there is a sensor attatched to your airbox, it's called the intake air temperature sensor, those two hoses you pulled off attatch to that sensor, the sensor is there to see if the throttle body should be heated during cold starts, you don't need it, find a place to zip tie the sensor and hoses out of the way, you're going to want to attatch the hoses back to the sensor first though, once you do that bleed the system and you should be good to go
That's a useless system in california. I ditched mine entirely.
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Old 04-18-2007, 05:19 AM   #6 (permalink)
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Thanks for the quick response guys. problem is solved now, it seems i had broke the water cooling circuit by removing the stock paper ait fliter unit. so just attached the 2 hoses i took off it together and now the cooling is flowing properly again.

cheers again
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