Good day mga sirs,

First post po at newbie dito sa Tsikot. Just wanna clear something. i am in the elimination process of the factors affecting the problem of my car. i have a Proton Wira 96 A/T. My problem is, when the engine temp goes up (a little more than the half on my guage) the cars goes jerking and seems like downshifting and upshifting on and on. I really don't know what seem to be the problem. But if i turn off the engine for a few seconds and start the engine again, the problem's gone until it reaches the same temp when the first problem occured. Do you think it has to do with the engine temp? or on the ATF temp. i am reading a lot of threads suggesting A/Ts here in the Philippines needs transmission coolers. Sirs, do you thing this is my problem? Am i over heating my ATF? I am traveling every day from bulacan to makati (back and forth approx 70 km). Do I need to install transmission cooler? how much does it cost? sorry po, daming questions. will wait for your replies mga sirs.