1996 Chevy Camaro No Heat

Vapor lock?, that's insane.

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If they are..........

The temperature is controlled by the use of an air mix door that is operated by an electric motor/actuator. This door can be jammed or the actuator can be inoperative or have stripped plastic gears internally.

I'll have my husband check it tonight....it was a GM shop mechanic who told me it was a vapor lock...thanks I'll let you know how it goes

I've been doing this 40 years and never in my life heard of a cooling system vapor locking. That's a term used many years ago. It would happen to fuel lines. If it has an air pocket, which he may be referring to, there will be a reason for it.