The typical cost to replace a Cummins 6.7 thermostat ranges from $300 to $950, depending on parts, labor, and region. Key cost drivers include thermostat quality, coolant flushing, timing cover access, and whether an auxiliary sensor or gasket is required.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Thermostat (OEM) | $40 | $90 | $160 | Higher for electronic or heavy-duty variants |
| Labor | $120 | $360 | $600 | Typically 2–6 hours depending on access |
| Coolant & Materials | $25 | $60 | $120 | Includes replacement coolant and seals |
| Additional Parts | $0 | $40 | $150 | Gaskets, O-rings, additives |
| Diagnostics / Labor Time | $15 | $60 | $150 | Initial diagnostic + testing |
Assumptions: region, vehicle model, labor rates, and whether a coolant flush is performed.
Overview Of Costs
Replacing a Cummins 6.7 thermostat typically costs between $300 and $950, with most jobs landing in the $450–$750 range in common market conditions. The exact price hinges on whether the mechanic can access the thermostat without disassembly, the need for a coolant flush, and the quality of parts chosen.
Cost Breakdown
| Component | Low | Average | High | Notes |
|---|---|---|---|---|
| Thermostat (OEM or equivalent) | $40 | $90 | $160 | Electronic variants cost more |
| Labor | $120 | $360 | $600 | 2–6 hours depending on access |
| Coolant & Seals | $25 | $60 | $120 | Includes disposal |
| Gaskets / Add-ons | $0 | $40 | $150 | Potential hose clamps or sensors |
| Diagnostics | $15 | $60 | $150 | Test drive and temperature checks |
| Taxes | $0 | $0 | $0–$50 | Regional varying |
What Drives Price
Access to the thermostat is a primary driver, with diesel engines often requiring under-hood clearance and coolant drain. Labor time increases with engine placement, whether the thermostat is mounted on the engine block or a timing cover module. A higher-quality thermostat, extended warranties, or additional sensors add to the total.
Ways To Save
Shop for an exact OEM part or reputable aftermarket equivalent to avoid returns or failures. Scheduling maintenance during off-peak periods can reduce hourly labor costs, and some shops offer bundled coolant flushes at a fixed price. If the truck is under warranty or a service contract, confirm coverage for thermostat and cooling system work.
Regional Price Differences
Prices vary by region: Urban areas tend to be higher than Rural markets. The following ranges illustrate typical deltas:
- West Coast: +5% to +15% vs national average
- Midwest: near national average
- Southeast: -5% to +5% vs national average
Local shop availability and shop rates influence final quotes, with some shops charging flat diagnostics instead of hourly rates.
Labor, Hours & Rates
Labor typically runs 2–6 hours for a thermostat replacement on a Cummins 6.7, influenced by hose access, fan shrouds, and whether a coolant flush accompanies the service. Regional labor rates commonly range from $90 to $180 per hour.
Additional & Hidden Costs
Hidden costs can include coolant disposal, recycled part fees, and disposal of old components. Some shops may bill for vehicle re-fluids after a flush, or for sensor re-calibration if applicable. Always request a written estimate with itemized line items before work begins.
Real-World Pricing Examples
Assumptions: 6.7L Cummins, coolant flush included in some quotes, standard OEM thermostat.
Basic: Thermostat only, no flush; 2 hours labor; Parts $60; Total $300–$450.
Mid-Range: Thermostat + coolant flush; 3.5 hours; Parts $90; Labor $270; Total $450–$650.
Premium: Thermostat with sensor upgrade and extended warranty; 4.5 hours; Parts $150; Labor $360; Total $700–$950.
Sample Quotes Snapshot
- Basic—Thermostat, standard coolant, no sensor work: $320; 2 hours; $40 part + $160 labor + $60 coolant
- Mid-Range—Thermostat, coolant flush, new gasket: $520; 3 hours; $90 part + $270 labor + $60 coolant + $100 misc
- Premium—Thermostat with sensor, coolant flush, disposal, warranty: $930; 5 hours; $160 part + $350 labor + $120 coolant + $300 extras
Assumptions: region, specs, labor hours.