Apple took a while to adjust to the Intel chips’ heat production compared to the PowerPC chips they had been using. Windows laptops with the early C2 Duos makers generally had massive vents and big noisy fans, but that didn’t suit Apple’s aesthetic. I had the first-gen C2D MacBook, but after they issued a firmware update to cope with the heat problem (I believe it just kicked the fan up at lower temperatures). No problems after that.
