pls i just got a fairly used toyota pick-up manual with auxiliary gear and my mechanic told me that the fan ought not to oscillate immediately the engine starts so he wants do something to it so that it stops but i dont know jack abt automobile so i will like some inputs from the professionals before ignorance spoils show. the mechanic also mentioned thermostat and regulation on the issue pls help me because the vehicle is essential for my operations. thanks

I think what your mechanic is trying to say is that the vehicle's fan has been connected directly to the battery and the thermostat has been removed . I think it's a wise decesion to have me restore it to the original configuration ,if that's what you are trying to say ...
Cons of driving without fixing it
-engine does not reach optimum operating temperature hence, sludge build up ,loss of power ,excessive load on engine ...

KayB: pls i just got a fairly used toyota pick-up manual with auxiliary gear and my mechanic told me that the fan ought not to oscillate immediately the engine starts so he wants do something to it so that it stops but i dont know jack abt automobile so i will like some inputs from the professionals before ignorance spoils show. the mechanic also mentioned thermostat and regulation on the issue pls help me because the vehicle is essential for my operations. thanks

it depends big 4x4, vans and tracks etc the fan runs with the engine, as the fan is connected to the engine

you should have gave us the full description of the pick up as for thermo he should remove it, its meant to regulate engine temperature to run recommended operating temperature to that you get best perfomance from the engine and better mileage