Coolant Leak from Radiator After Long Drives

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Coolant Leak from Radiator After Long Drives

I noticed coolant under my Proton X70 after long highway drives, especially in hot weather. The leak appears to be coming from the radiator area near the bottom/front. There’s no overheating message yet, but the coolant level s quickly. Could this be a crack in the radiator core, damaged lower hose, o r weak radiator seam? Has anyone in Pakistan experienced this issue in high-temperature driving conditions?

Talha Kyanii asked on 19 Dec 2025 17:08:06 pm

1 Answer

8 views |

Gari Master - on 19 Dec 2025 17:10:35 pm

A coolant leak after long drives — especially in hot weather — can come from several common sources:

Likely Causes:

Cracked Radiator Core o r Seam: The radiator can develop tiny cracks o r weak seams that leak under pressure when the engine gets hot.

Lower Radiator Hose o r Joint: Heat and vibration can weaken the lower hose o r its connection, causing slow leaks.

Radiator Cap Seal Failure: A worn cap can’t hold pressure, letting coolant escape at higher temperatures.

What to Check:
✔ Look for wet spots around the radiator core and seams.
✔ Inspect lower radiator hose and clamps for signs of coolant residue.
✔ Check coolant reservoir and cap for proper sealing.

Tip: In Pakistani conditions high temperatures on highways, a worn radiator o r old hoses are more likely to fail under heat stress. If the coolant level keeps ping and you see drips under the front of the car after long runs, prioritize a radiator pressure test at a workshop.