http://www.cygnusx1.net/Supra/Librar...spx?F=8716&P=1
So the lower part of 87240, where the two hoses meet, is leaking?
If so then you just need to find a replacement. You can bypass that valve for the time being with a 90 degree pipe and your heat will work fine. Your air conditioning will also work with it bypassed but it won't get quite as cold.