What is an Intercooler?
A radiator-like cooler that reduces the temperature of compressed air before it enters the engine.
Simplified animation — not to scale.
In plain English
An intercooler is a heat exchanger that sits between the turbocharger (or supercharger) and the engine's intake manifold. Its job is to cool down the hot, compressed air before it enters the cylinders, making the air denser and allowing more oxygen to be packed into each combustion cycle.
"Like blowing on hot soup before eating it — the intercooler cools down the air so the engine can 'drink' more of it safely."
How it works
Hot air from the turbocharger is forced through a network of thin fins and tubes inside the intercooler. Ambient air (on an air-to-air intercooler) or coolant (on an air-to-water intercooler) draws heat away from the compressed air. Cooler air is denser, meaning more oxygen molecules fit into each cylinder — that improves power, efficiency, and reduces the risk of engine knock.
Signs of trouble
- ⚠Loss of power, especially at higher speeds
- ⚠Engine feels hotter than usual
- ⚠Whistling or hissing from turbo hoses
- ⚠Black smoke from the exhaust under load
- ⚠Oil or coolant leaking from the intercooler
£140 – £500 fitted
Always get a written quote. Prices vary by car, region, and parts brand.