The needle should remain in the middle though the needle could be the culprit then if tstat is present in the system.
Is there auto fan switch present in your car or has been removed by some mechanic..
The temperature of coolant should be maintained by tstat at about 80-85 degree centigrade. And the radiator fan auto switch is present there to turn the fan onn at about some 88-92 degree centigrade..
Usually 99% mechanics in Pakistan are against tstat valve according to them this is for use in colder areas not in hotter areas.
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