Quote Originally Posted by integral90 View Post
hehe, I usually drive with the heater on. And make sure the last few km of a journey I don't go WOT or rev high.

Could your alternator be on the way out? Maybe you should upgrade to a K20A accessory pulley
Okay. Interesting. I'll drive one day with the heater on full and see exactly how much a difference it makes to the operating coolant temperature.

So what's the issue with a higher coolant temperature? Does this affect the efficency of the engine?

What's the difference between the K20A accessory pulley and the one that comes stock on the car? I'll get it to the dealer sooner or later. It's just not convient at the moment to have to leave my car overnight with the dealer.