2000 silverado ( same part as tahoe) radiator tank on the driver's side has a verticle crack about an inch long. Is there a product to patch this till i can replace the radiator?

Not that I have ever seen that really works. The problem is that as the coolant system heats up. It builds pressure. The pressure will then push past any repair you might try. However.

However. You could try fiber glass resin and pieases of the fiber glad sheets. Clean and dry the cracked area very well. Mix up the resin and apply some to the cracked area. Then lay pieases over the crack and apply more resin to the pieases of fiber glass sheet pieases. Let it dry for a few hours or over night. This might get you by a couple of days. Nothing ventured nothing gained