Heater or valve leak????? How to take it out????
Olduster, here`s a page out of an earlier service manual and this unit includes air cond. but it should give you something to go by. You should remove it as a unit. You`ll see the connection by your right fresh air intake. On the left page at the right bottom you`ll see a hook with a nut on the end that goes up the air intake. HTH.