Check-Engine Diagnostics
We read the codes and diagnose the real cause, so you fix the actual problem instead of replacing parts by guesswork.
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Open 8:00 am until 5:30 pm today
Downtown Cleveland engine repair
A check-engine light, a rough idle, a knocking noise or a puddle under the car can all mean very different things, and guessing gets expensive fast. That is why our downtown shop starts every engine job with a genuine diagnosis instead of throwing parts at the problem. We read the codes, test the actual cause, and tell you in plain language what is going on and what it will take to fix. Our shop sits in the bottom of the Hamilton Garage at Hamilton and East 12th, close to work and easy to reach.
Our ASE-certified team handles the full range of engine work, from misfires, sensors and leaks to cooling-related problems and major repairs, and we back qualifying new parts with our Fixed for Life warranty. Drivers often come to us for a second opinion on a big engine estimate, and we would rather give you an honest answer than an expensive one. For related work, see our engine and transmission repair overview.
What we do
Everything your engine needs under one roof at the base of the Hamilton Garage, from a check-engine diagnosis to major repair, handled while you work downtown.
We read the codes and diagnose the real cause, so you fix the actual problem instead of replacing parts by guesswork.
Schedule online →Rough idle, hesitation or a misfire? We diagnose ignition and fuel issues and restore smooth, reliable running.
Schedule online →We diagnose and repair oxygen sensors, emissions faults and other causes behind a check-engine light or a failed e-check.
Schedule online →We find and repair engine oil and coolant leaks before they lead to overheating or serious engine damage.
Schedule online →We inspect and replace worn belts, hoses and timing components that can leave you stranded or damage the engine.
Schedule online →When bigger work is truly needed, we handle it with quality parts, and qualifying new parts are covered for life.
Schedule online →What Cleveland drivers say
I was having issues with my engine after entering downtown Cleveland. A coworker mentioned Rad Air, so I dropped it off. Within a few hours they provided a detailed update: the engine would need to be replaced. Not wanting to spend the money and wanting a second opinion, they made my car ready to drive home. I took it to my trusted mechanic, who diagnosed the exact same issues, and the estimate was almost dollar for dollar. Thank you Rad Air for the service and honesty.
I am happy to report that for the first time I was not wondering if I was treated fairly. I took my 2023 Kia Sportage in because the engine light came on. When I got the repair code from Rad Air, I ran it through AI to see what it should cost. Rad Air was right on the money. Paul, the manager, gave me additional advice about keeping the expense down. I will be back should other issues arise.
I am originally from Michigan and have family in Ohio. My vehicle was cutting off all the way driving to Ohio. The good people at Rad Air took good care of me, and I drove back to Michigan later that night and my vehicle worked great! Thanks again.
I went in for a smoke test, and they did a courtesy checkup highlighting the main concerns. Great service, thank you Paul.
Paul is absolutely amazing. Very responsive to any concerns and great about setting timely appointments. He explains repairs clearly, especially for someone like me who doesn't know a lot about cars, and he is honest about critical repair needs versus repairs that can wait.
Fast service and transparent pricing. Definitely going to be heading back there next time my car needs work!
Paul and team were amazing! Excellent customer service and professional work. I highly recommend them!
Reliable, friendly and honest! I tried other shops in the area before coming to Rad Air and I wish I had just started here first. I will keep coming back!
These guys have integrity. They let you know exactly what you need and don't try to upcharge unnecessarily. Would highly recommend.
They always get work done in a timely manner. Prices are reasonable as well. The manager is very helpful and makes the entire process very easy. Highly recommend coming here!
From the time I dropped my car off I felt I was in good hands. When it was explained what was needed and why, I was confident in what I was told. I have no complaints and will return if another concern arises.
Paul and his team are excellent to work with. They were clear with what they found, providing an estimate and completing the work quickly. Great job!
Meet your shop manager
Regulars ask for Paul by name, and you'll spot him again and again in our Google reviews. He and the ASE-certified team handle everything from a check-engine diagnosis to major engine repair, with straight answers, upfront pricing and no upsell. Stop by the Hamilton Garage and he'll get you taken care of.
Schedule with Paul's teamFind us
We're in the bottom of the Hamilton Garage at the corner of Hamilton and East 12th, with free loaner vehicles and shuttle rides so you're never stranded downtown.
Who we serve
From the Downtown, Ohio City and Tremont core out to Lakewood (44107), Cleveland Heights (44118) and East Cleveland, if you live, work or park anywhere in Cuyahoga County, an honest engine diagnosis is only minutes away.
Good to know
Every repair carries our 36-month/36,000-mile parts & labor guarantee, whichever comes first, and qualifying new parts are covered for as long as you own your vehicle. See what's covered →