[e90will]

Hi, I'm planning to replace my waterpump + ts as part of preventative maintanance. Do I need to replace the expansion tank too? I'm at 134K.

Thanks

[mike3000fl]

You don't have to. You could replace that shitty little plastic vent screw on it though, mine cracked and leaked.

If the tank failed later, it would only leak and go into limp mode.

If your waterpump had failed catastrophically, I suppose we could argue that the tank may have been stressed by overheating pressure as a result and could be weakened prematurely. But you are talking about doing preventative maintenance so I am assuming your pump and stat are both working still (just changing them for peace of mind and to save a hassle later).

[e90will]

Originally Posted by mike3000fl

You don't have to. You could replace that shitty little plastic vent screw on it though, mine cracked and leaked.

If the tank failed later, it would only leak and go into limp mode.

If your waterpump had failed catastrophically, I suppose we could argue that the tank may have been stressed by overheating pressure as a result and could be weakened prematurely. But you are talking about doing preventative maintenance so I am assuming your pump and stat are both working still (just changing them for peace of mind and to save a hassle later).

Thank you! Yes, I plan on changing them for peace of mind and not have to worry about being stuck on the road if they fail.

I figure it makes sense based on the mileage of the car and also my upcoming roadtrip to Vegas..(hot weather & desert heat)