Well my thermostat is shot I need to put in a new one. I bought it 6 bucks. Do I need to drain all of my fluid to change it.

 

You'll need to drain about a gallon to keep from making a mess and killing the neighborhood cats. Just drain it in a clean bucket and you can pour it back in. Might be a good time to flush it though.

 

Thanks I guess that will be my plan. As for the flush I don't want to do that since the color is near perfect it looks like it was prolly done before I bought it. The truck was given a tune up before I bought it which included antifreeze I am guessing.