Heat and air need work on the 85SD. I smell antifreeze when the heat is turned on so the heater core &/or hoses may be leaking. Switchover valves behind the passenger console test good but # 13 & 17 don't hold vacuum on going to the pods. AC system also has a leak which I haven't looked for yet. Should I pull the dash & replace all vacuum pods along with heater core and hoses or try to work it some other way? What else likely needs attention while I'm in there? I hate "while I'm at its". Sometimes that leads to thousands spent.