High coolant temp
I've had my 99 Bon ssei for about 5 years now. Every summer, when driving on interstates, in hot weather, the temperature gauge slowly creeps up over 200. I never let it get 230. I'm able to get it to go back down by turning off the AC but sometimes I have to reduce speed. This is most noticeable at interstate speed 70-80, but it was really bad when driving in the mountains at low speed/high rpm. The condensor fins are in pretty rough shape. I straightened them once, but after one winter they looked about the same. As far as I can tell, everything is working fine under all other conditions. I was contemplating replacing the condensor and or the radiator, ,maybe a high flow t-stat,or have others noticed this? My 93 never did this. LIM gaskets, Tstat, hoses, water pump (mostly NAPA components) have all been replaced, and I have no reason to suspect the gauge is bad.