You have a 1994 ford escort lx 19 liter w ac changed thermstat and flushed cooling system the engine never gets to operating temp is this a radiator issue or water pump?

Since you mention flushing the system, you could have big air pocket in the cooling system. Each time you run it, let it cool down then check the level in the radiator, not just the overflow tank. Also the thermostat could be in backward, or a faulty one (even though it's new) Never open a radiator cap if it is HOT! Those would be the first two places to look.