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Discussion Starter · #1 ·
Hello everyone.

Recently I changed my radiator on my 05 Celica (140bhp) and did a complete coolant flush. New radiator is working great and my temperature is fine.

The issue is, when I start up the car from cold and start driving for a few minutes, a sudden loud banging noise will emanate from under the bonnet and remain loud until I pull over and stop. I cannot replicate this noise when idle and it only happens when the engine is cold. What could this be? Part of me thought that there might be air in the system, but surely I'd be able to emulate that when idling? It ONLY happens when driving with a cold engine.
The noise seems relative to the speed as well, being quite loud at 40mph and getting quieter as I slow down to a stop.
Any help please :)
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