- Buick Ownership
I have a 2010 Buick enclave cxl and the temp raises to 230-240 degrees when I go uphill. Transmission starts to stick and will not shift property when it starts to overheat. I've personally changed the water pump, radiator, radiator cap, cooling fan, thermostat, coolant temp sensor, and radiator hoses. I've done a block test and refilled radiator with vacuum system. Dealership can't figure it out. Could it be a transmission problem causing the engine to overheat?