It depends on the reason they are stating they need replaced. If your engine is overheating or has another issue, then yes, I would think they should be replaced pretty soon. If the engine overheats it can actually cause serious engine damage.
As for doing it yourself, I have attached the procedure for replacing both. They are pretty straight forward however, if you have never done it I would not do it alone. See if there is someone in your circle of friends that has ever replaced them. Maybe they haven't done it on this vehicle but the process is the same for each, the location of the sensor and thermostat is the only difference.
Please let me know how else I can assist and I will be happy to do it.
Images (Click to enlarge)
Sunday, May 19th, 2019 AT 10:44 AM