How to replace the water pump on 4.8L, 5.3L, and 6.0L engines on 2003 Chevrolet Express 3500?

To change the water pump on 4.8L, 5.3L and 6.0L engines drain the cooling system, remove air cleaner assembly, fan blade and hoses. Disassemble tensioner and water pump bolts, replace water pump with a new one with gaskets and attach all the parts. Lastly, fill up the cooling system.

OEM 2003 Chevrolet Express 3500 Water Pump

H2O Pump

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2003 Chevrolet Express 3500 Water Pump Part Number: 12703898
$187.62 MSRP: $364.18
You Save: $176.56 (49%)
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Product Specifications
- Other Name: Pump Kit-Water *Use Together With Gask; Pump Kit, Engine Coolant
- Replaces: 12681184, 12686763, 19256261
- Item Weight: 11.50 Pounds
- Item Dimensions: 21.5 x 16.1 x 9.4 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 12703898
- Warranty: This genuine part is guaranteed by GM's factory warranty.
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Fits the following 2003 Chevrolet Express 3500 Submodels:
- Base, LS, LT | 8 Cyl 4.8 L GAS, 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
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2003 Chevrolet Express 3500 Water Pump Part Number: 89018166
Product Specifications
- Other Name: Pump Kit, Water; Water Pump Assembly
- Replaces: 12458935, 12456113, 88894290, 89017439, 89018040
- Item Weight: 14.60 Pounds
- Item Dimensions: 20.8 x 13.6 x 8.7 inches
- Condition: New
- SKU: 89018166
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Chevrolet Express 3500 Submodels:
- Base, LS, LT | 8 Cyl 4.8 L GAS, 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS

2003 Chevrolet Express 3500 Water Pump

With a comprehensive array of OEM 2003 Chevrolet Express 3500 Water Pump, from fuel pumps to door handles, our website is a one-stop-shop for your needs. All our genuine 2003 Chevrolet Express 3500 Water Pump are backed by the manufacturer's warranty and are offered at competitive prices in the market. Rest assured, you can shop with complete confidence.

2003 Chevrolet Express 3500 Water Pump Parts and Q&A

Q: How to replace the water pump on 4.8L, 5.3L, and 6.0L engines on 2003 Chevrolet Express 3500?
A: To change the water pump on 4.8L, 5.3L and 6.0L engines drain the cooling system, remove air cleaner assembly, fan blade and hoses. Disassemble tensioner and water pump bolts, replace water pump with a new one with gaskets and attach all the parts. Lastly, fill up the cooling system.