2000 Grand AM water vs coolant

I believe the optimal mix is 50/50 water/coolant. The water dilutes the antifreeze so it flows better through the radiator and water is a better 'coolant,' but antifreeze has properties needed that water alone can't provide - it is a rust inhibitor, and it doesn't freeze and has a much higher boiling point. Too much water, and it has the potential to boil away, lowering coolant levels, and causing the engine to overheat. Too little water, and the coolant mix is thicker and doesn't achieve as low an operating temperature. However that is not really an issue, so long as the engine stays withing operating ranges. With water alone, you also have the potential to never achieve optimal operating temperature, especially if you live in a cold/cool environment. I won't mention what a bad idea it is to just have water in the radiator if you live in a cold area as I think everyone knows about that. Your owner's manual will list the optimal temp for your engine.

The 2000 grand am takes a certain DEXcool coolant only. My question is can you use a different brand coolant? I bought a travellers brand that is 50/50 mix and am wondering if I should use it or not. I’ve been seeing mixed answers on this.

Do NOT use any coolant other than Dexcool, Havoline, or all makes/all models coolant! If the coolant doesn't clearly say all makes/all models on the bottle, don't use it!! Mixing any coolant will Dexcool will cause a chemical reaction that will create a sludge like substance that will clog your cooling system. All makes/all models coolant can be safely mixed with any type of coolant! Hope that helps! Jim