Radiator replacement
Cracked tanks, clogged cores, and corroded radiators replaced with OEM-spec or premium aftermarket units that fit and flow correctly.
Cooling System
Radiator Repair and Replacement in Boulder, CO
Overheating at altitude is hard on an engine. We find the leak, fix the cause, and get your cooling system back to spec before it cooks something expensive.
Radiator repair, radiator replacement, coolant leak diagnosis, and full cooling system service for Boulder County drivers. We pressure test, find the real source of the leak, and repair it with quality parts and a three-year warranty.
Cooling system and radiator work done right.
An overheating engine rarely has one simple cause. We test the whole system so the fix actually holds, instead of chasing the same leak twice.
Coolant leak diagnosis
Full pressure test of the system to pinpoint the leak, whether it is the radiator, a hose, the water pump, or a gasket.
Water pump replacement
Failing or weeping water pumps replaced before they leave you stranded on a mountain pass.
Thermostat service
Stuck-open thermostats kill your heat in winter; stuck-closed ones overheat your engine. We replace and verify operation.
Coolant flush and fill
Old, acidic coolant replaced with the correct specification fluid to protect the radiator, water pump, and heater core.
Hoses, caps, and fans
Radiator hoses, pressure caps, fan clutches, and electric cooling fans inspected and replaced when worn.
Heater core diagnosis
No heat or a sweet smell inside the cabin usually points to a heater core. We diagnose it the right way.
Signs your cooling system needs attention.
If you notice any of the following, do not wait. Small issues become expensive ones quickly.
- Temperature gauge climbing into the red or fluctuating
- Green, orange, or pink coolant puddles under the vehicle
- Steam or a sweet smell from under the hood
- Low coolant warning or having to top off coolant often
- Heater blowing cold air when set to hot
- Overheating on climbs up Boulder Canyon, the Peak to Peak, or I-70
How we handle a cooling system repair.
Verify the complaint
We confirm the symptom, whether it is overheating, a visible leak, or coolant loss with no obvious puddle.
Pressure test the system
A cold pressure test shows exactly where coolant escapes before we replace a single part.
Diagnose the root cause
Radiator, water pump, thermostat, hoses, or gaskets. We identify the actual failure, not just the symptom.
Review the estimate with you
You get a clear, itemized estimate and a plain explanation before any work begins.
Repair with quality parts
Repairs done with OEM-spec or premium parts and the correct coolant specification for your vehicle.
Bleed, test, and road test
System bled of air, brought to full operating temperature, and road tested under load to confirm the fix.
Why bring cooling system work here.
We find the real leak
Pressure testing first means we fix the actual source, not whatever part is easiest to sell.
Built for Colorado conditions
Altitude and steep grades stress cooling systems hard. We service for the driving you actually do here.
Correct coolant, every time
Mixing the wrong coolant ruins radiators and water pumps. We use the exact specification your vehicle requires.
Three-year warranty
NAPA Peace of Mind warranty covers qualifying cooling system repairs for three years or thirty-six thousand miles.
Mile-high roads ask more of every vehicle.
Boulder vehicles work harder. Thinner air, hard freezes, dust, sun, and steep grades all wear parts faster than the manufacturer schedules assume. We tune our service intervals to how your vehicle actually lives at altitude.
Altitude
Lean-running engines, harder-working turbos, and drivetrains that climb every commute.
Freeze cycles
Repeated thaw and refreeze chews through seals, hoses, batteries, and brake hardware.
UV and dust
High-altitude sun and grit accelerate paint, plastics, glass, and intake fouling.
Frequently Asked Questions
It depends on whether you need a hose, a thermostat, a water pump, or a full radiator replacement, and on your specific vehicle. We pressure test the system first, then give you an itemized estimate before any work starts so there are no surprises.
You may also need
Boulder talks. We listen.
“These guys are honest, transparent, and clearly know what they are doing. They walked me through everything with photos before doing the work.”
Sarah K.
2019 Subaru Outback
“Best shop in Boulder. Free loaner, fair pricing, and they actually care about doing the job right. Will not take my truck anywhere else.”
Marcus T.
2017 Toyota 4Runner
“I am picky about who touches my EV. Legacy was the only shop locally that I trusted with the work, and they delivered.”
Priya N.
2022 Tesla Model Y
“These guys are honest, transparent, and clearly know what they are doing. They walked me through everything with photos before doing the work.”
Sarah K.
2019 Subaru Outback
“Best shop in Boulder. Free loaner, fair pricing, and they actually care about doing the job right. Will not take my truck anywhere else.”
Marcus T.
2017 Toyota 4Runner
“I am picky about who touches my EV. Legacy was the only shop locally that I trusted with the work, and they delivered.”
Priya N.
2022 Tesla Model Y
Ready to Book?
Schedule your radiator repair in boulder today.
Free loaner vehicles for qualifying repairs. Photo and video documentation on every job. Three-year, 36,000-mile NAPA warranty.