thanks for the responses, guys. i'm back from vacation to fix the
problem, if i can. the mono valve (heater control valve in the haynes
manual) has the broken part. i saw one for $165-- any other places i
also, the part that was broken inside the firewall has a smaller hose
going into it and a spring-controlled valve that i assume opens and
closes. i can't find a picture that matches this part. i haven't seen
a "windshield heater" yet, but i'll keep looking.