The heater core can be uncrimped from the metal lines coming thru the firewall and exit the heater box down on the lower left side of the dash near the gas pedal without gutting the ENTIRE dash, but it isn't easy. If it comes to that, I can get some data together that tell more about the process.
Take a look at the AC evaporator drain under the hood at the firewall for signs of red coolant showing up there. Eventually, if the leak becomes large enough, some will collect at the bottom of the HVAC box and drip out.
Take a look at the AC evaporator drain under the hood at the firewall for signs of red coolant showing up there. Eventually, if the leak becomes large enough, some will collect at the bottom of the HVAC box and drip out.