How to Replace a Water Pump?

To remove the water pump, drain the cooling system, disconnect the radiator, and bypass hose. Remove the cooling fans, drivebelt cover, drive belts, timing belt, tensioner, idler pulley, and left camshaft sprocket. Remove the rear timing belt cover, tensioner bracket, and camshaft sensor. Loosen the water pump bolts, remove the pump and gasket, and clean the engine surface. Compare the new and old pumps, apply sealant to the new gasket and pump, and install. Apply RTV sealant to bolt threads, position the pump and gasket, and tighten bolts.

What Are the Signs of Water Pump Failure?

Water pump failure, causing engine damage due to overheating, is indicated by coolant leakage and a howling sound. This shouldn't be confused with drivebelt slippage, which squeals. The pump is at the engine's front, and a coolant puddle under the vehicle likely means a failed pump seal. Noise from the pump suggests a worn impeller shaft bearing, possibly confirmed by wiggling the drive pulley.

Genuine Subaru Legacy Water Pump

H2O Pump

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18 Water Pumps found

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Subaru Legacy Water Pump Assembly
Part Number: 21110AA690
$148.87 MSRP: $208.50
You Save: $59.63 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
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Fits the following Vehicles:
- 2013-2019 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.5L H4, 2.5L H4 DOHC
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Subaru Legacy Water Pump Complete
Part Number: 21111AA240
$107.41 MSRP: $149.18
You Save: $41.77 (28%)

Add to Cart
Product Specifications
- Other Name: Water Pump
- Manufacturer Note: OIL COOLER O
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
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Fits the following Vehicles:
- 2004-2009 Subaru Legacy | Baja-B, GT, GT Limited, XT Limited | 2.5L H4 Turbo
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Subaru Legacy Water Pump Complete
Part Number: 21111AA280
$129.60 MSRP: $180.00
You Save: $50.40 (28%)

Add to Cart
Product Specifications
- Other Name: Water Pump
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
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Fits the following Vehicles:
- 2006-2009 Subaru Legacy | 2.5i, 2.5i Base, 2.5i Limited, Base | 2.5L H4
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Subaru Legacy Water Pump Assembly
Part Number: 21110AA360
$118.50 MSRP: $164.58
You Save: $46.08 (28%)

Add to Cart
Product Specifications
- Other Name: Water Pump
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
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Fits the following Vehicles:
- 2001-2009 Subaru Legacy | 3.0R, 3.0R Limited, 3.0R LL-Bean, Flat6, Flat6 L.L.Bean, Flat6-S, SUS Flat6 | 3.0L H6
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Subaru Legacy Water Pump Complete
Part Number: 21111AA320
$110.12 MSRP: $152.95
You Save: $42.83 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
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Fits the following Vehicles:
- 2010-2012 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium | 2.5L H4 SOHC
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Subaru Legacy Water Pump Assembly
Part Number: 21110AA510
$157.08 MSRP: $220.00
You Save: $62.92 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump
- Replaced by: 21110AA511
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
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Fits the following Vehicles:
- 2010-2019 Subaru Legacy | 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring | 3.6L H6
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Subaru Legacy Water Pump
Part Number: 21111AA110
$111.78 MSRP: $155.25
You Save: $43.47 (28%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
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Fits the following Vehicles:
- 1997-2005 Subaru Legacy | 2.5i, 2.5i Limited, Baja, Baja-S, Base, Brighton, Cold Weather, GT, L, Limited, LS, L-S, LS-I, Out Back, Post, SUS, SUS Limited | 2.2L H4 , 2.2L H4 (New EVAPO), 2.2L H4 Series, 2.5L H4
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Subaru Legacy Water Pump Complete
Part Number: 21111AA380
$130.46 MSRP: $181.20
You Save: $50.74 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
View More
Fits the following Vehicles:
- 2010-2012 Subaru Legacy | 2.5GT Limited, 2.5GT Premium | 2.5L H4 Turbo
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Subaru Legacy Water Pump
Part Number: 21111AA003
$85.58 MSRP: $118.87
You Save: $33.29 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Replaced by: 21111AA007
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
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Fits the following Vehicles:
- 1996-1997 Subaru Legacy | Brighton, GT, L, LS, LS-I, Out Back, Post, SUS | 2.2L H4 , 2.2L H4 (New EVAPO), 2.5L H4
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Subaru Legacy Water Pump
Part Number: 21111AA002
$85.58 MSRP: $118.87
You Save: $33.29 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Replaced by: 21111AA007
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
View More
Fits the following Vehicles:
- 1992-1996 Subaru Legacy | Base, Brighton, GT, L, LS, LS-I, Out Back, Post | 2.2L H4 , 2.2L H4 (New EVAPO), 2.5L H4
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Subaru Legacy Water Pump
Part Number: 21111AA004
$85.58 MSRP: $118.87
You Save: $33.29 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Replaced by: 21111AA007
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
View More
Fits the following Vehicles:
- 1997 Subaru Legacy | Brighton, GT, L, LS, LS-I, Out Back, Post, SUS | 2.2L H4 , 2.2L H4 (New EVAPO), 2.5L H4
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Subaru Legacy Water Pump
Part Number: 21111AA021
$130.14 MSRP: $180.75
You Save: $50.61 (28%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Replaced by: 21111AA026
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
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Fits the following Vehicles:
- 1991 Subaru Legacy | Turbo
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Subaru Legacy Water Pump
Part Number: 21111AA000
$85.58 MSRP: $118.87
You Save: $33.29 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Replaced by: 21111AA007
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
View More
Fits the following Vehicles:
- 1990 Subaru Legacy | Base, L, LS, LS-D
View related parts
Subaru Legacy Water Pump
Part Number: 21111AA001
$85.58 MSRP: $118.87
You Save: $33.29 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Replaced by: 21111AA007
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
View More
Fits the following Vehicles:
- 1990-1992 Subaru Legacy | Base, L, LS, LS-D
View related parts
Subaru Legacy Water Pump
Part Number: 21111AA005
$85.58 MSRP: $118.87
You Save: $33.29 (29%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Replaced by: 21111AA007
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
View More
Fits the following Vehicles:
- 1997 Subaru Legacy | Brighton, GT, L, LS, LS-I, Out Back, Post, SUS | 2.2L H4 , 2.2L H4 (New EVAPO), 2.5L H4
View related parts
Subaru Legacy Water Pump
Part Number: 21111AA060
$116.75 MSRP: $162.15
You Save: $45.40 (28%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Replaced by: 21111AA065
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
View More
Fits the following Vehicles:
- 1992 Subaru Legacy | Turbo
View related parts
Subaru Legacy Water Pump
Part Number: 21111AA061
$116.75 MSRP: $162.15
You Save: $45.40 (28%)

Add to Cart
Product Specifications
- Other Name: Water Pump Complete
- Replaced by: 21111AA065
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
View More
Fits the following Vehicles:
- 1992-1994 Subaru Legacy | Turbo
View related parts
Subaru Legacy Pump Assembly Water
Part Number: 21110AA770
$118.06 MSRP: $163.97
You Save: $45.91 (28%)

Add to Cart
Product Specifications
- Other Name: Pump Ay Water
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
View More
Fits the following Vehicles:
- 2020-2021 Subaru Legacy | 2.4R F/R-O, 2.4R Limited, 2.4R Touring, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.4L H4 DIT, 2.5L H4 DI

Subaru Legacy Water Pump Parts Questions & Answers

Water Pump Assembly
21110AA360
Q: How to Replace a Water Pump?
A: To remove the water pump, drain the cooling system, disconnect the radiator, and bypass hose. Remove the cooling fans, drivebelt cover, drive belts, timing belt, tensioner, idler pulley, and left camshaft sprocket. Remove the rear timing belt cover, tensioner bracket, and camshaft sensor. Loosen the water pump bolts, remove the pump and gasket, and clean the engine surface. Compare the new and old pumps, apply sealant to the new gasket and pump, and install. Apply RTV sealant to bolt threads, position the pump and gasket, and tighten bolts.
Water Pump Complete
21111AA240
Q: What Are the Signs of Water Pump Failure?
A: Water pump failure, causing engine damage due to overheating, is indicated by coolant leakage and a howling sound. This shouldn't be confused with drivebelt slippage, which squeals. The pump is at the engine's front, and a coolant puddle under the vehicle likely means a failed pump seal. Noise from the pump suggests a worn impeller shaft bearing, possibly confirmed by wiggling the drive pulley.

Related Subaru Legacy Parts

About Subaru Legacy Water Pump

The Subaru Legacy water pump is the heart of a car's cooling system as it transports water cooled by the radiator to the engine block. After the cooled water goes through the engine block, it is sent back through the pump to the radiator, creating a constant, ever-flowing supply of needed cool water. If the Subaru Legacy water pump stops functioning, the coolant temperature remains stagnant and the engine will over-heat, majorly damaging its components.