A thermostat replacement runs $150 to $400 at most shops. Easy access on some engines, deeply buried on others. The part is cheap; labor varies enormously. Here is the breakdown.
Most drivers pay $200 to $300 at an independent shop for a thermostat replacement with fresh coolant.
Some thermostats sit at the top of the engine and are 30 minutes; others (especially V6/V8) require intake or timing cover removal.
Plastic housings often crack and get replaced together.
Most jobs include coolant top-off; some require full flush.
Hard-to-bleed cooling systems take longer to do correctly.
Indie shops are routinely 40%+ cheaper than dealerships.
| Vehicle | Typical Range | Notes |
|---|---|---|
| Compact car (easy access) | $150 - $250 | most accessible |
| Midsize sedan | $200 - $300 | typical |
| SUV / pickup | $220 - $380 | larger engine |
| Buried (some V6/V8) | $350 - $600 | high labor |
| Luxury / European | $300 - $500 | often integrated |
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If your scan tool is showing one of these codes alongside symptoms that point to this repair, run a free AI diagnosis to confirm the root cause before paying for parts.
🔬 Run a free AI diagnosis →Slow warmup, never reaching operating temp, or running too hot. Code P0128 (coolant temp below thermostat regulating temp) is the smoking gun for a stuck-open thermostat.
Yes - the engine just runs cold and gets bad MPG. A stuck-CLOSED thermostat causes overheating and is dangerous for the engine.
Typically 100,000+ miles. Skipping coolant changes shortens life - acidic coolant fouls the spring mechanism.
Yes - cheap insurance while the system is open. The reverse is also true if the radiator is fairly new.
On many V6/V8 engines, the thermostat is buried under the intake manifold or behind the timing cover. That adds 1-3 hours of labor.