Quote Originally Posted by typhoon
Nangyari na sakin yan last January lang. EG naman. Coming from Laguna sa SLEX at about 140 km/hr. Pansin ko na lang nasa 3/4 na temp ko. Pinatay ko aircon ayun bumalik sa normal. Since then I replaced the following: water pump, aircon aux fan motor and radiator. Before I replaced the radiator, nung papunta Tagaytay, direcho naman andar, lumalagpas ng kalahati temp ko kapag paahon ung daan pero bumabalik din normal pag patag na. But after replacing radiator, hi speed man o paahon ung daan, my temp has always been at the normal level.
Temp indicator should go up when your AC is ON. If you check, your AC condenser is located in front of your engine cooling radiator, so it not getting the full effect of cooling when your AC is ON. Actually, your condenser also act as barrier for any foreign object that might puncture your engine radiator, which still keep your running and getting you wherever your going. But as you said, your indicator is not reacting when the AC is engage, you might have to check if that thermometer sensor is properly installed by your mechanic, if its installed make sure that it has lithuim grease on it.