Quote Originally Posted by CivicVTi View Post
*Polista

Have the radiator cap checked or replaced if it is more than 4 years old. The spring underneath may not be doing its job to release internal pressure when needed. Make sure the replacement is of the same spec as the original.
I also have a 97 Accord with the same problem. City driving is fine, but long drives at ~100Kph along SLEX/NLEX with the aircon on caused it to overheat.

Turns out it was the radiator cap. Bought a 1.1 bar rated cap from speedyfix and all was fixed.