We're in the process of replacing the radiator preemptively before something fails. Turns out, the transmission cooler was installed aftermarket, is not heavy duty and not routed through both the cooler and the old radiator. I just had a discussion with our mechanic. His suggestion was to go ahead and route it through the radiator now for maximum cooling since we've moved to the desert where the average temperature exceeds 110*F (120-125*F some days) for multiple months in the summer. If it was an ideal world I'd switch to a heavy duty cooler and still bypass the radiator but it's not in the budget right now. His suggestion makes sense to me. Any thoughts?