Your car’s cooling and heating systems don’t just keep you comfortable—they also keep your engine healthy. These two systems work together to regulate temperature inside the cabin and under the hood. Here’s a quick breakdown of how they work, the parts involved, and when to consider a replacement.

How the Cooling System Works

The cooling system keeps your engine from overheating. It circulates coolant (antifreeze) through the engine and radiator to absorb and release heat. Its key parts are:

• Radiator
• Water pump
• Thermostat
• Radiator fan
• Coolant / antifreeze
• Hoses & clamps

How the Heating System Works

Your heater pulls warmth from the hot engine coolant and blows it into the cabin through the heater core. Its key parts are:

• Heater core
• Blower motor
• Temperature control valve
• Cabin air filter

When to Replace Parts

• Frequent overheating
• Inconsistent cabin temperature
• Coolant puddles under the car
• Unusual noises from the fan or heater
• Heater not blowing warm air (can also be a cooling system issue)

Keep Your Car at the Right Temperature

At Car parts for Uk, we carry everything you need to repair or upgrade your vehicle’s heating and cooling system—from radiators and thermostats to heater cores and blower motors.