Will doing a cooling system refresh this weekend, including the plastic pipes. I don't think those pipes have been touched in 273,000 miles. Not looking forward to pulling the intake manifold. Putting in a new Graf water pump with metal impeller. My hope is I never have to touch that again. Won't be changing the thermostat as I had to replace that recently. The expansion tank only has about 2 years on it as well. Same with the trans cooler thermostat. Radiator is still in good shape. I have one leaky hose.