What causes water to drip from firewall hose?
What causes water to drip from firewall hose? It also will drip if you run your defroster. it cycles the air conditioner. CRAZYHORSE is correct....Running the HVAC system in the defrost position will cycle the A/C system. And yes, coolant always flow through heater core. Is the coolant in a firewall always the same color? And yes, coolant always flow through heater core. If the heater core were leaking and draining out of that tube, the coolant should be the same color as in the rest of the system. If what is leaking is clear and the coolant is not,...