How much coolant does a Hummer H3 hold?

The Hummer H3 cooling system holds 6-10 quarts total depending on the engine. A drain-and-fill replaces about 50-60% of the coolant. For a complete flush, you'll need the full capacity amount.

What type of transmission fluid does a Hummer H3 use?

The Hummer H3 transmission fluid type depends on whether it's an automatic or manual transmission and the model year. Always use the manufacturer-specified fluid — check your owner's manual for the exact ATF or manual transmission fluid required.

Does a Hummer H3 have power steering fluid?

2015+ Hummer H3 models with electric power steering don't use power steering fluid. Older models with hydraulic power steering use ATF or manufacturer-specific fluid — check your owner's manual.

What brake fluid does a Hummer H3 use?

Most Hummer H3 models use DOT 3 or DOT 4 brake fluid. DOT 4 has a higher boiling point and is preferred for performance driving. Never use DOT 5 (silicone-based) in a system designed for DOT 3/4.

🧪Fluid Capacities

Hummer H3 Fluid Capacities

All fluid capacities for your Hummer H3: engine oil, coolant, transmission fluid, brake fluid, power steering, and more.

Quick Answer

The Hummer H3 requires multiple fluids maintained at specific levels. Engine oil, coolant, transmission fluid, brake fluid, and power steering fluid all have different capacities depending on your engine and model year.

2006-2010

Engine OilVaries by engine — check owner's manual (typically 4-8+ quarts)

Coolant (total system)6.0 - 10.0 quarts

Transmission Fluid3.5 - 4.0 quarts (drain & fill) / 7-9 quarts (total)

Brake FluidDOT 3 or DOT 4 — ~1 quart for full flush

Power Steering FluidATF or manufacturer-specific — ~1 quart

Windshield Washer~1 gallon

Notes

→Never mix different types of coolant — flush completely when changing brands
→Transmission fluid should be checked with the engine running and at operating temperature
→Brake fluid absorbs moisture over time — replace every 2-3 years regardless of mileage

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Frequently Asked Questions

How much coolant does a Hummer H3 hold?: The Hummer H3 cooling system holds 6-10 quarts total depending on the engine. A drain-and-fill replaces about 50-60% of the coolant. For a complete flush, you'll need the full capacity amount.
What type of transmission fluid does a Hummer H3 use?: The Hummer H3 transmission fluid type depends on whether it's an automatic or manual transmission and the model year. Always use the manufacturer-specified fluid — check your owner's manual for the exact ATF or manual transmission fluid required.
Does a Hummer H3 have power steering fluid?: 2015+ Hummer H3 models with electric power steering don't use power steering fluid. Older models with hydraulic power steering use ATF or manufacturer-specific fluid — check your owner's manual.
What brake fluid does a Hummer H3 use?: Most Hummer H3 models use DOT 3 or DOT 4 brake fluid. DOT 4 has a higher boiling point and is preferred for performance driving. Never use DOT 5 (silicone-based) in a system designed for DOT 3/4.

Hummer H3 Repair Guides

→Hummer H3 Coolant Flush →Hummer H3 Transmission Fluid Change →Hummer H3 Brake Fluid Flush

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