My A/T montero GLS has problems with overheating. Pabalik balik na sya sa casa. Initially tinanggal/condemned thermostat and cleaned the radiator fins. Pero after 1 week or so, bumalik ang problema. When the new thermostat became available, pinakabit ko. Tumaas pa rin. Next, pinalitan nila ang water pump, after a week or so, tumaas ulit. The problem does not come out right away. Casa also checked it with their computers, tried replacing the sensors but says there is nothing wrong with the sensors. Eventually, may GLX Montero A/T pumasok sa casa while waiting for insurance claim for total loss but the radiator was not affected. Kinabit nil yung radiator sa unit ko. It ran for a week but last night, going uphill for 500 meters at 50kph and 2,500 rpm, then 200-300 meters at 40kph and 2,800rpm before mag level off ang road, by the time we level off, the temp starts to creep up to the next line, and slowly goes up to almost red, then I would pop the hood to improve the ventilation.

There is no bubbles on the coolant reservoir, nor is there oil/water mix to say there is a head gasket problem. Naubos na kasi ang ano pa pwedeng masabi na yun ang cause ng overheat. An outside shop said na baka may leak ang head gasket that when going uphill, causes pressure buildup but not noticeable in terms of bubbles or oil/water mix.

Unit is at 77K mileage.