Overheating, low coolant, or a gauge that climbs at every red light. We pressure test the system and find the actual cause instead of topping it off.
A cooling system has one job: move heat out of the engine faster than the engine makes it. In Central Florida, the hardest part of that job isn't the highway. It's sitting still. At speed, air moves through the radiator on its own. In stop-and-go traffic on a 95 degree afternoon, with the AC compressor adding its own load, the system is leaning entirely on the fans and on coolant that's already close to its working limit. That's why a lot of cars here run fine on the interstate and creep up the gauge waiting at a light.
The system is a loop, and the parts in it fail independently. Coolant carries the heat. The water pump moves it. The thermostat decides when it circulates. Hoses and the radiator cap hold pressure so the coolant can get hotter without boiling. The radiator and the fans dump the heat into the air. Any one of those failing looks about the same from the driver's seat, which is why guessing gets expensive fast.
So we test instead of guessing. A cold pressure test holds the system at operating pressure long enough for a seep to show itself, which beats topping off the reservoir and sending you out the door. We watch the thermostat as the engine comes up to temperature, verify both fan speeds, check what the cap is actually holding, and squeeze every hose. Whatever we find gets photographed and sent to your phone, so you're looking at the same stain or split we are before you decide anything.
This page is the starting point, not the whole story. When the problem turns out to be the radiator core or the water pump specifically, those repairs have their own pages and their own decisions to make. What happens here is figuring out which part of the loop is actually the problem, so you only pay to fix that one.
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Usually a cooling fan that isn't coming on when it should, or a system low enough on coolant that it can't move heat efficiently. Highway airflow covers for both problems, which is why the gauge behaves until you stop.
Small leaks often evaporate off a hot engine before they ever reach the driveway. A pressure test holds the system under load long enough to show where it's escaping.
That's coolant landing on something hot. Common sources are a seeping hose connection, the radiator cap, or the heater core, and each one gets confirmed a different way.
Often a low coolant level or a thermostat stuck open, so the engine never reaches the temperature the heater depends on. It's an early warning that costs nothing to check.
That's a pressure problem. A cap that won't hold, a thermostat stuck closed, or combustion gases getting into the coolant will all do it, and they get tested separately.
Shut it down and call. Continuing to drive an overheating engine turns a hose or thermostat repair into a head gasket repair, and that is a very different bill.
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Learn moreCommon questions about our cooling system repair services.
You can get home that way. But coolant doesn't get used up the way oil does, so if the level dropped, it went somewhere. Topping off without finding the leak means you'll be doing it again, usually at a worse time and in a worse place.
It can. The AC condenser sits right in front of the radiator and adds heat exactly where the radiator is trying to shed it, and the compressor puts extra load on the engine. If your car only runs hot with the AC on in traffic, that's a real clue, and the fans are the first thing we test.
Sometimes, if the coolant is old and contaminated and heat transfer has fallen off. More often overheating is a failed part, and a flush just delays finding it. We'd rather test first and tell you which situation you're in.
It depends on the manufacturer, and the types aren't interchangeable. Mixing them can cause gelling and corrosion inside the system. We look up the specification for your vehicle rather than pouring in whatever says universal on the jug.
There's a test for it. We check the coolant for combustion gases and watch how the system behaves under pressure. That gives a specific answer rather than a guess, and we'd rather rule it out early than have you find it after paying for other parts.
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