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On the T1 Silverado the water pump is a belt-driven bolt-on part, not a timing-cover job, so it is well within DIY range. The 5.3L and 6.2L are the easiest: drop the belt, pull eight bolts with a 15 mm socket, and the pump comes off the front of the block. The 2.7L turbo and 3.0L Duramax are the same idea but with less room, a separate pulley to remove, and more plastic coolant fittings to unclip without breaking.
The mistake people make is the refill, not the removal. This system holds around 12-14 quarts and traps air in the heater core and rear of the block, so a truck that seems fine in the driveway will spike the temp gauge on the first hill. Use a vacuum filler or a spill-free funnel with the heater on full and keep topping off through two full cool-down cycles before you call it done.
| Item | Type | Product search |
|---|---|---|
| Floor jack 2-ton minimum Lift the front end to reach the radiator drain and lower belt area. | Required | search retailer |
| Jack stands 3-ton pair Support the truck while draining coolant and working under the front. | Safety | search retailer |
| Drain pan 8-10 quart low profile Catch the coolant from the radiator drain and block. | Required | search retailer |
| Socket set 3/8 in drive, 8-19 mm 6-point Covers shroud, belt, bracket and pump fasteners across all engines. | Required | search retailer |
| Ratchet 3/8 in drive, plus 1/4 in drive for tight spots Main driver for nearly every fastener on this job. | Required | search retailer |
| Extension set 3/8 in drive, 3 in / 6 in / 10 in, plus wobble extension Reaches the upper and lower pump bolts past the pulleys and brackets. | Required | search retailer |
| Serpentine belt tool Long-handle belt tool with 15 mm, 16 mm, 18 mm sockets and 3/8 in square drive Releases the spring-loaded belt tensioner on all four engines. | Required | search retailer |
| Socket 10 mm, 1/4 in and 3/8 in drive Battery negative terminal, air intake duct clamps, fan shroud and small brackets. | Required | search retailer |
| Socket 13 mm, 3/8 in drive Fan shroud bolts, upper radiator support, coolant pipe brackets; some pumps use 13 mm M8 bolts. | Required | search retailer |
| Socket 15 mm 6-point, 3/8 in drive Water pump attaching bolts on the 5.3L L84 and 6.2L L87. | Required | search retailer |
| Torx bit sockets T20, T25, T30, T40, 1/4 in and 3/8 in drive Engine cover, air box and some accessory bracket fasteners, common on the 2.7L and Duramax. | Required | search retailer |
| Torque wrench 3/8 in drive, 10-80 ft-lb (15-100 Nm) Pump bolts thread into aluminum and must be torqued evenly in sequence. | Required | search retailer |
| Hose clamp pliers Flat-band / spring clamp pliers with cable The factory spring clamps on the radiator and heater hoses will not move with hand pressure. | Required | search retailer |
| Coolant funnel kit Universal spill-free funnel with GM/Chevy adapter Fills and burps the system without air pockets at the surge tank. | Required | search retailer |
| Vacuum coolant filler Air-powered venturi type, needs compressor Fastest way to avoid trapped air in the heater core and rear of the block. | Recommended | search retailer |
| Pick and hook set Assorted, right-angle Frees stuck O-rings, plastic coolant fitting locks and shroud clips. | Recommended | search retailer |
| Trim removal tools Nylon pry set Pops the plastic air dam, engine cover and shroud retainers without breaking tabs. | Recommended | search retailer |
| Breaker bar 1/2 in drive, 18-24 in Extra leverage on a seized tensioner or on the accessory pulley bolt. | Recommended | search retailer |
| Adapter 3/8 in female to 1/2 in male Lets you use the breaker bar on 3/8 in belt tool sockets. | Recommended | search retailer |
| Scraper and gasket surface pad Plastic scraper, non-metallic abrasive pad Cleans the aluminum sealing face without gouging it. | Consumables | search retailer |
| Brake or parts cleaner Aerosol, non-chlorinated Removes coolant residue from the block face and bolt holes. | Consumables | search retailer |
| Shop towels Heavy duty roll Coolant cleanup around the alternator and belt path. | Consumables | search retailer |
| Thread locker Medium strength blue, if the service procedure calls for it Some GM pump bolts are supplied pre-coated; replacements may need blue locker. | Consumables | search retailer |
| Water pump Engine-specific GM/ACDelco or equivalent, includes gasket/O-ring The seal is integral to the new pump; do not reuse the old gasket. | Parts | search retailer |
| Coolant Dex-Cool / GM orange HOAT, 50/50 premix, 2-3 gallons Refill after draining; the T1 system holds roughly 12-14 quarts total. | Parts | search retailer |
| Serpentine belt Engine-specific accessory drive belt Cheap insurance while the belt is already off, especially over 60k miles. | Parts | search retailer |
| Spring hose clamps or worm clamps As needed for hoses disturbed Weak or corroded factory clamps often leak after being reopened. | Parts | search retailer |
| Safety glasses ANSI Z87 Coolant splash and debris when releasing hoses and cleaning the block face. | Safety | search retailer |
| Nitrile gloves Chemical resistant Dex-Cool is toxic and irritating to skin. | Safety | search retailer |
5.3L L84 and 6.2L L87 pumps use 15 mm heads on most applications (some pumps are 13 mm M8 — check yours before you buy a single socket). The 2.7L L3B and 3.0L LM2 use mostly 13 mm and 10 mm fasteners plus Torx on brackets and covers, and both require removing the water pump pulley first. Duramax trucks also add plastic quick-connect coolant fittings that need a pick to release, which the V8s do not have.
| Water pump bolts, 5.3L L84 / 6.2L L87 | 22 ft-lb (30 Nm) in sequence — verify in the service manual |
| Water pump bolts, 2.7L L3B | verify in the service manual |
| Water pump bolts, 3.0L LM2 Duramax | verify in the service manual |
| Water pump pulley bolts (where separate) | verify in the service manual |
| Drive belt tensioner bolt | verify in the service manual |
| Radiator drain cock | Hand tight only, quarter-turn plastic — do not wrench |
| Fan shroud / upper radiator support bolts | about 7 ft-lb (10 Nm) — verify in the service manual |
For the V8s, draining the radiator is usually enough to get the level below the pump, though you will still spill a quart or two when the pump comes off. Have a pan and towels under the front of the engine and expect to add back close to the full 12-14 quart capacity if you drained heavily.
No. The 2.7L L3B has a conventional belt-driven mechanical water pump, though it also uses an auxiliary electric coolant pump for the turbo circuit on some builds. Replacing the main pump still means pulling the accessory belt and pulley.
GM Dex-Cool orange extended-life coolant, 50/50 premix with deionized water. Do not mix it with green IAT or universal yellow coolant, and do not top off a Dex-Cool system with tap water.
Look for crusty orange residue or a wet trail directly below the pump weep hole, a whine or growl that changes with engine speed, and side-to-side play at the pulley. If coolant loss shows up with no visible leak at the pump face, check the surge tank, radiator seams, and heater hose connections before replacing the pump.