1992 Ford Aerostar. Radiator/Cooling issue?

I just got this van knowing it needed a radiator. When I went to get a flush to see if that'd fix it. STS said they couldn't flush it because it was clogged with rust. I was also clogged the water pump. Basically everything needed to be replaced. They did not charge me, and gave me a guess of around $1000.00.
Does this seem right? The price? That a flush will not fix the problem? And that everything needs to be replaced?

If the cooling system has been neglected, the system will corrode and plug up. At that point you have to start replacing parts. A flush isn't magic.

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