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F20 / F21 1 Series (2012 - Current)
The second generation of the BMW 1 Series range of hatchback cars. Not available in the USA the F20/F21 was released in 2011 as the successor to the E81/E87. The body styles of the F20/F21 range are a 3-door hatchback (F21) and 5-door hatchback (F20).

The coupe and convertible models were spun off to create the BMW 2 Series.

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Old 08-06-2019, 05:57 AM
Fersyboy Fersyboy is offline
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1series coolant loss

I have a 2015 116i 1 series diesel my problems with this car started with a swirl flaps issue had to get a new inlet manifold about 3 month ago everything was okay till about 3 weeks ago I got a warning about low coolant ? Iíve had the car over 2 years and never had to top it up Iíve now topped it up 3 times in the last 3 weeks any ideas ? Is this a known issue.

Thx in advance
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Old 08-06-2019, 06:03 AM
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Doug Huffman Doug Huffman is online now
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A known issue to the extent that provision is made to add coolant.

If you have a mechanical water pump, its gland seal packing is cooled and lubricated by a weeping leak of coolant. Third generation BMW mechanical water pumps should not have visible liquid leakage as they have a collection chamber for the weepage to steam it away with a hot engine. Visible liquid is evidence of a failing BMW THIRD GENERATION mechanical water pump.
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Old 08-06-2019, 06:30 AM
Fersyboy Fersyboy is offline
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Originally Posted by Doug Huffman View Post
A known issue to the extent that provision is made to add coolant.

If you have a mechanical water pump, its gland seal packing is cooled and lubricated by a weeping leak of coolant. Third generation BMW mechanical water pumps should not have visible liquid leakage as they have a collection chamber for the weepage to steam it away with a hot engine. Visible liquid is evidence of a failing BMW THIRD GENERATION mechanical water pump.
Thx for reply there is no evidence of leak and Iíve checked under oil cap and no emulsification canít locate a leak anywhere do you think it could have been anything to do with the inlet manifold being changed? The cars only done 63000 miles had nothing but bother this year with it any guidance appreciated.
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