Disconnect the green vacuum line from the pump.
This pic show how the second set of harness runs on the top side of the unit. 3 disconnected ends are shown (ovals).
Disconnect 4 vacuum lines from pumps. Remove entire harness.
Remove the top housing. Note that the lower half of foam for blower fan trim is left intact.
My deadly leaking heater core was finally removed. Clean up the inside of HVAC unit and the AC unit. The styrofoam under the AC unit was totally worn with antifreeze but I washed thoroughly and reused it.
More Heater Core Replacement
4x4 Off-Road Homestead Firearms RC Flying