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F30 Coolant Expansion Tank & Coolant Lines cost
Cracked expansion tank, coolant flange, turbo coolant line leaks. Real prices reported by owners on Reddit and BMW forums, with a link to every one.
Limited data: Better, but still no dealer price for the tank alone. The tank prices below are mostly N55 (F10, E82) tanks, which fail the same way as F30 tanks.
Typical cost
Ranges are the lowest and highest prices in the table below. They are not estimates. Shop prices include parts and labor unless noted.
Every price we found
| Price | Where | Details | Source |
|---|---|---|---|
| $2,500 | Dealer | Dealer quote, turbo coolant return line, 2017 330i xDrive (said turbo must come out) | [1] |
| $1,400 | Indy | Local BMW shop quote, same turbo line, no turbo removal | [1] |
| $1,500 | Indy | Paid to replace coolant flange, 2017 330i | [2] |
| $100 | DIY | Expansion tank part is "like a $100 part and an hour work" | [4] |
| $400 | Indy | Expansion tank incl. labor, indy quote in NE New Jersey, F10 N55 (2023) | [6] |
| $115 | DIY | New N55 expansion tank at ECS Tuning ($115.33, 2018) | [5] |
| $50 | DIY | Tank vent hose (17 12 8 570 061) from the dealer, "less than 50 USD", F30 335i | [7] |
- A cracked tank vent hose causes the same sudden leak. A dealer asked $75 for that hose, and one owner says the fix takes minutes (source 7).
- Early F30 N20/N26 cars built to 8/2012: BMW bulletin SI B17 02 12 says a corroded level-sensor connector can trigger a false low-coolant warning. Rule that out before buying a tank (source 8).
- One N55 owner went through 3 tanks in 8 years, all failing at the bonded seam (source 5).
- An independent shop in Sydney quoted A$520 for tank, coolant and labor (source 3). Not converted or included in the USD ranges.
- One owner reports replacing the turbo coolant line in under an hour in a home garage with no turbo removal.
How long it takes
Tank: about an hour with basic tools, per an owner (source 4). Turbo coolant line: under an hour DIY with no turbo removal, per an owner (source 1).
Which cars are affected
2012–2019 3 Series / 4 Series (F3x). Includes the expansion tank, coolant flange and the turbo coolant return line.
Symptoms
- Low coolant warning
- Sweet coolant smell, pink/blue crust around the tank seams or hoses
- Coolant drips under the front of the car
- Overheating in severe cases
Parts list
| F30 coolant expansion tank | ECS TuningPelican PartsAmazon |
| Expansion tank cap | ECS TuningPelican PartsAmazon |
| Turbo coolant return line (N20/B48) | ECS TuningPelican PartsAmazon |
| BMW coolant (blue) | ECS TuningPelican PartsAmazon |
Check fitment for your exact car (VIN) before ordering. Links may become affiliate links in the future.
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Common questions
How much does F30 Coolant Expansion Tank & Coolant Lines cost at a BMW dealer?
Real dealer prices we found ranged $2,500 (1 data point, median $2,500).
How much does an independent shop charge for F30 Coolant Expansion Tank & Coolant Lines?
Independent shop prices ranged $400 to $1,500 (3 data points, median $1,400).
Can I do F30 Coolant Expansion Tank & Coolant Lines myself?
Owners who did it themselves reported $50 to $115 in parts and tools.
How long does F30 Coolant Expansion Tank & Coolant Lines take?
Tank: about an hour with basic tools, per an owner (source 4). Turbo coolant line: under an hour DIY with no turbo removal, per an owner (source 1).
Which BMWs are affected?
2012–2019 3 Series / 4 Series (F3x). Includes the expansion tank, coolant flange and the turbo coolant return line.
Related repairs
Sources
- Turbo Coolant Line Leak (Reddit r/F30)
- Quoted ~$4k to Fix Turbo Coolant Line and Oil Filter Housing? (Reddit r/BmwTech)
- Cost for replacing coolant expansion tank - BMW (F30, Sydney) (Whirlpool Forums)
- N55 Maintenance Prices (Reddit r/F30)
- N55 coolant expansion tank leak (1Addicts)
- N55 COOLANT LEAK DRIVER SIDE (BimmerFest)
- Coolant Vent hose crack (F30 Bimmerpost)
- SI B17 02 12: Low Coolant Warning Is Displayed (F30 N20/N26) (BMW service bulletin via NHTSA)
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