92 Chevy Cavalier Wagon- Heater Core

Look under the hood. You'll see 2 heater hoses going to the firewall. Those hoses connect to the heater core. That is the location behind the dash you need to look for. I know some vehicles, you have to remove the dash to get to it. You can try calling the dealer and ask them if the dash has to be removed. Also you can look under the dash to see if part of the heater box will come apart to gain access to the core. Hope this helps some.