Radiator Pressure Cap: Essential Cooling Component

Why This Part Is Needed

The radiator pressure cap is a small but crucial part in keeping your engine cool. It seals your cooling system and maintains the correct pressure, preventing coolant from boiling over or leaking. This helps your engine stay at the proper temperature, even on long drives or hot days.

How It Works

When your engine heats up, coolant expands and creates pressure. This cap holds that pressure to a safe level (usually 13-16 psi) before letting excess flow into the overflow tank. It ensures coolant is always available and keeps air out of the system, avoiding engine overheating.

What Happens If Broken

If the pressure cap fails, loss of pressure may occur. This causes coolant to boil and escape, leading to overheating, engine damage, or costly repairs. Symptoms include visible leaks, temperature spikes, and constant need to refill coolant.

Compatibility

• Qx70/Fx
• Qx50/Ex