Car radiator maintenance cost?

I own a 2000 Ford Explorer with a 5.0L V8 and I recently had to add water to my coolant reservoir (i was in a pinch). I now have coolant but I'm unable to find the drain valve. If i were to take it to a repair shop, how much would it cost for them to flush the water out so I can put the new coolant in? I'm worried that my car will overheat on my way there or back without being able to pay for the service (currently low on $$)

Water is coolant, you car will work just as well.

How much water did you add, a pint or less?

If so it won't make any difference, just top it up with neat coolant next time.

If the radiator was completely empty (doubtful) then you would need to drain and refill with the correct mixture of coolant and WATER 50/50 is usual. Plain water will freeze and can corrode the engine but if you've just topped up the reservoir then nothing to worry about.

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