on my dads 94 explorer after even a short drive there is a small leak coming from some where near the thermastat, however if the heat isn't used there is no leak. we have been trying to see where exactly the leak is coming from but is hard?? i know it's not an f150 but any ideas?? 1994 explorer 4.0l V6 XLT 180,000 mi

 

Check the rad hose coming from the heater core

 

will go take a look now thanks