i have alto VXR 2006 about 65k driven.
problem is when i drive on motorway above 100km/h with AC on, car starts heating up and temperature needle goes to 3/4 of gauge. in city driving and less than 100km/h speed or AC off it remains normal(1/2) level.
i have experienced same problem about 5 months before.then i serviced the radiator, installed new genuine thermostat valve.it became normal.perhaps due to weather change it remains normal and same problem again when summer about to start.i have recently serviced my AC and my heater is bypassed from coolant path.I'm using "Payro" (maybe "piro") coolant and it was about 5 months old when i serviced radiator.
please help me.
thanx in advance
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