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Recipe - 6.6L V8 Gasoline (GM HD, L8T 2020+)

Reliability build

Reliability tier: aggregated - verify before ordering, see /disclosure/

Cooling inspection and wear-item service for the 6.6L L8T on a towing HD truck: pressure-test, weep hole, hoses, thermostat (mode Cooling system wear: water pump, hoses, thermostat (towing duty)).

Parts

• 6.6L L8T Thermostat Kit (OEM) - thermostat kit (qty 1)
• 6.6L L8T Water Pump (OEM) - water pump (qty 1)
• gm-hd-gas-l8t: coolant (service item) - coolant refill with the specified coolant (qty 1)

Install order

1. pressure-test the cooling system at service intervals
2. inspect the water pump weep hole, hoses and thermostat
3. replace the worn item; refill with the specified coolant

Expected outcome

No seep, firm hoses, steady temperature on long tows.

Parts budget

About $40-$300 in parts, plus parts we have no price for. It depends on what the diagnosis finds; each option below is what you buy together. Prices marked "at Dave's" are Dave's Auto Center's, the same as in his store; the others are approximate prices from OEM and maker catalogs, rounded (a manufacturer's list price can run higher). Parts only, no labor.

• about $40: 6.6L L8T Thermostat Kit (OEM) (about $40)
• about $300 plus parts we have no price for: 6.6L L8T Water Pump (OEM) (about $300) + gm-hd-gas-l8t: coolant (service item) (no price yet)

DIY or shop: DIY or shop