'90 Tbird heater core

so the heater core starts blowing steam on my windshield.. how painful of a fix am I in for tommorow? enough to just bypass the damn
thing for the summer?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.