Radiator Repair at Johnny's Automotive
Coolant puddle up front, crusty seams, or an engine that stays hot with the coolant full. We check the radiator itself and give you a straight repair or replace answer.
How do I know it's the radiator and not something else?
The radiator is the part of the cooling system that actually gets rid of heat. Hot coolant comes in at the top, spreads across a core of thin tubes and fins, and the air moving through those fins carries the heat away. It's a heat exchanger, and when it stops exchanging heat, everything upstream of it looks like it's failing too.
Radiators fail in a few predictable ways. Most modern radiators use plastic end tanks crimped to an aluminum core with a gasket in between, and enough heat cycles will eventually make that seam weep or crack the tank outright. The core gets restricted from the inside when old coolant breaks down and leaves deposits, so coolant still flows but heat transfer drops off. And the face of the radiator gets wrecked from the outside by road debris, bugs, and packed mud, which is easy to confirm with a light through the grille.
A few symptoms point at the radiator specifically rather than somewhere else in the loop. A puddle near the front center of the vehicle. Dried coolant crust along the top or bottom seam. Overheating that's steady rather than intermittent. And a radiator that stays hot at the top while the bottom hose barely warms, which suggests flow is being choked inside the core. The opposite pattern, an engine that's hot while the whole radiator stays cool, usually means coolant isn't being circulated at all, and that's a water pump conversation instead.
On repair versus replacement, you'll get the honest answer for your vehicle. A cracked plastic end tank isn't a repair, it's a replacement. Light fin damage often isn't worth touching at all. Some older all-metal radiators can still be cleaned out or repaired by a shop that does that work. We'll show you photos of what we found, tell you which category you're in, and let you decide, rather than defaulting to the biggest ticket. Radiator work is backed by our 36 month, 36,000 mile nationwide warranty.
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Problems we fix
Our experts diagnose and resolve any issue.
Colored puddle under the front of the vehicle
Radiator leaks tend to drip near the front center, ahead of the engine. The color depends on the coolant your vehicle uses, and where it lands tells us where to start looking.
White or crusty residue along the top or bottom seam
That's dried coolant left behind by a slow seep, most often where a plastic end tank meets the aluminum core. It means the leak has been working on that seam for a while.
Engine overheats with full coolant and working fans
A restricted core lets coolant through but can't shed the heat. Old or contaminated coolant leaves deposits inside the tubes, and once enough of them are plugged the radiator falls behind.
Bent, packed, or missing fins visible through the grille
Bugs, mud, and road grit block the air the radiator needs, and debris strikes flatten the fins outright. Sometimes a careful cleaning solves it, sometimes the damage has gone too far.
Overheating that started right after hitting road debris
A rock or a piece of tire tread can puncture a tube or crush a section of core without leaving a mark anywhere else on the car. This one is usually obvious once we get a light behind the grille.
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Learn moreRadiator Repair questions, answered
Common questions about our radiator repair services.
Can a radiator be repaired instead of replaced?
Sometimes. Older all-metal radiators can occasionally be cleaned out or repaired. Most radiators on newer vehicles use plastic end tanks, and once one of those cracks or the seam lets go, replacement is the only fix that holds. We'll tell you which kind is in your car before you spend anything.
Is a bottle of stop-leak worth trying first?
We don't recommend it. Those products work by clogging things, and they can't tell the difference between the pinhole you want plugged and the heater core or thermostat you don't. It can turn a radiator job into a much bigger one.
Why is my radiator leaking when the car isn't that old?
Heat cycles wear a radiator out, not miles. Central Florida heat plus a lot of idling puts the plastic and the gaskets through more cycles at higher temperatures than the same car would see somewhere cooler. Age in years often matters more here than the odometer.
Do the hoses and cap have to be replaced at the same time?
Not automatically. We check them while everything is open, because a swollen hose or a cap that won't hold pressure will undo a new radiator quickly. If they test fine, we leave them alone and tell you so.
How do you make sure the air is out after a replacement?
We refill with the coolant your vehicle specifies and bleed the system through its designated points, then run it up to temperature and verify the fans and the cap. Air pockets left in a fresh system cause overheating that looks exactly like a bad repair, so that step isn't optional.
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