So my 09 Lancer GTS is starting to have problems occasionally with the CVT transmission slipping. I've owned it since new & have 160k miles on it now. I have replaced the fluid & changed the filter 4 times since I've had it. I have always used the genuine Mitsubishi CVT fluid.
I will be driving & occasionally the RPM's will rise without a corresponding increase in speed. It catches again and returns to normal a second or two later. It doesn't do it every time I drive. I notice it happens more when it's like 100⁰ outside, so probably has something to do with the heat. I have the GTS model so it has a trans cooler already.
Should I spend the money on a fluid flush & fill on this transmission or is the damage already done? I was thinking about getting a larger trans cooler & replacing it when I change the fluid, but just buying the fluid is about $200 already. I don't want to waste the money on the fluid if it's not going to help.
Anyone have a recommendation on where to get a replacement CVT? I can replace it myself. Or alternatively is a rebuild an option? I know very little about CVT transmissions.