Anyone know anything about a car's radiator?

Yes, you can take it to a radiator shop. The can usually solder things back together. If that is too expensive, try a wrecking yard for parts, WAY cheaper than taking it to a dealer. As for the cost, I'm not sure. I would venture a guess of at least 3-400 dollars though and possibly more. Good luck!!

That sounds a little too serious of a crack to just have it welded shut, you are better off with a used one from a junk yard. Just call the local junk yards and see if they have a radiator that will fit your car, though I know quite a few are going to newer cars only, so you may have to make a couple calls. If you plan on doing the next step, opt to remove the old radiator yourself as you will have a practice run. Next you can see if any of your friends will help you install it to help save labor. It's actually really simple to do, just remove a couple bolts, undo the bottom hose and allow the antifreeze to drain out, undo the top hose, take old radiator out, put new one in, and fill with new antifreeze. You can most likely google actual instructions on how to do it or they may also be on autozone's website.

Feel free to message me if you have any more questions.

If you are feeling adventurous, you can try to do it yourself and save a lot on labor (which is usually more than half the cost of most auto repairs).

Parts/tools you'll need:
1. Metric ratchet set or metric box wrench (harbor freight has them super cheap if you don't already have a set or can't borrow one)
2. Screwdriver (might be phillips or flathead, it varies by car maker)
3. A funnel
4. A 1+ gallon bucket
5. New anti-freeze (check your car's owner manual for how much coolant / anti-freeze it is supposed to hold, usually in the back of the booklet)

The main things you'll need to do:

1. Find a replacement radiator...check junk yards and parts dealers...might even be able to get a cheap one at Autozone
2. Drain radiator fluid (aka coolant) into a bucket...you do this by opening a drain spout on the radiator (if it has one), or disconnecting one of the hoses at the bottom. Have at least a 1 gallon bucket.
3. Disconnect all hoses from the radiator. Should be able to do this with a screwdriver to loosen the hose clamps, then pull them off.
4. With a ratchet set or box wrenches (I'm guessing it'll be 11mm to 14mm), unscrew all the nuts holding the radiator to the car...keep track of which ones go where
5. Remove old radiator, put in new one!
6. Put all the bolts back in and make sure they're tight (should be snug, but you don't have to have both feet on the car pulling on the wrench tight)
7. Reconnect all the hoses...this is the biggest pain in the *kitten* of all these steps, FYI
8. Refill the radiator with fluid. You can re-use the old fluid if you want to, or you can put in new fluid (and new fluid isn't THAT expensive, so really, you ought to).
9. When you think it's full, squeeze the top hose a few times with the radiator cap off. You should hear some gurgling and see the fluid go down thru the hole for the cap. Top it off, squeeze again, til it doesn't really go down much.
10. Put the cap back on, make sure there aren't any leaks from where you re-attached the hoses, and drive it around for awhile, keeping an eye on the temperature gauge. Get back to your house, let it sit for awhile to cool off, then check the fluid level. You can also check your overflow/reserve coolant tank, which is near the radiator.

Oh, yeah, don't let any pets or kids taste or drink the coolant. It's sweet tasting & it WILL ruin kidneys, usually kills, depending on how much is consumed.

Oh, yeah, don't let any pets or kids taste or drink the coolant. It's sweet tasting & it WILL ruin kidneys, usually kills, depending on how much is consumed.

good add-on, your body turns antifreeze into formaldehyde, so it doesn't take much to cause problems. People do love the antidote though (alcohol).

You can ask the junk yard if they will take the old antifreeze or what to do with it as there are usually places that accept it.