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Claim Your Free PageHarbor Radiator has built a steady following in Costa Mesa, earning a 4.6-star average across 20 reviews on the local directory. Operating Monday through Thursday from 9 AM to 4 PM, the shop has become a trusted name for cooling-system and A/C work serving drivers in Costa Mesa, Newport Beach, Huntington Beach, and the surrounding Orange County area. Customers describe the team as knowledgeable and straightforward, consistently recommending Harbor Radiator for quality work at prices that undercut dealership rates.
Unlike high-overhead chain shops that rely on glossy showrooms, Harbor Radiator operates from a plainly outfitted workspace where the equipment does the talking. The team has demonstrated its breadth by handling everything from a vintage 83 Porsche fuel tank repair to a Honda CR-V A/C recharge, and by assisting a stranded motorist who overheated near their location. This adaptability and willingness to help in urgent situations distinguishes them from shops that avoid complex or nonstandard jobs.
Reviewers repeatedly name Gregg as the reason Harbor Radiator earns repeat business, citing his combination of fair pricing and customer care that other shops simply do not match. Ryan Curtis described dropping his car off before close of business and finding it finished without error the next morning, calling it the most pleasant mechanic experience of his life. Max G echoed the theme, crediting the crew with completing his CR-V A/C work cheaply, quickly, and correctly. Whether it is Gregg solving a lingering cooling problem or the team turning around a vehicle overnight, customers consistently report walking away impressed by both the results and the demeanor of the people who delivered them.
All eight reviews award 5 stars, with five specifically praising fair pricing, three noting fast turnaround (one overnight), and four calling out the staff as friendly and knowledgeable. The lone 4-star reviewer confirms longtime loyalty while defending the shop against a misidentified complaint.
| Sunday | Closed |
| Monday | 9 AM–4 PM |
| Tuesday | 9 AM–4 PM |
| Wednesday | 9 AM–4 PM |
| ThursdayToday | 9 AM–4 PM |
| Friday | Closed |
| Saturday | Closed |
Fix leaks, cracked cores, and damaged fins; install new radiators when repair is not viable for most domestic and import vehicles.
Pinpoint causes of temperature warning lights and perform immediate interventions to prevent engine damage from heat.
Repair corroded or punctured fuel tanks, as demonstrated by a successful job on a vintage Porsche gas tank.
Diagnose insufficient cooling, reseal systems, and recharge refrigerant to restore comfort in vehicles like the Honda CR-V.
Assess hoses, clamps, thermostat function, and coolant condition to catch problems before they lead to roadside breakdowns.