I have a 2000 workhorse (chevy) 454cu in. Does anyone know what the coolant capacity is? If I just drain the radiator can I refill and get the proper 50/50 mix?
Yes, if you use 50/50 mix when refilling. Just make sure that the anti-freeze that you are using is compatible with what was in previously. Also make sure that all air is out of the system, which may mean that you have to burp the radiator a couple of times to expel all air bubbles.