What can cause a crossover tube housing to leak?
Just had the heater control valve, thermostat replaced and coolant system flushed on my '06 Lincoln LS at my local dealership. After I brought it home and parked it overnight, I noticed a fluid puddle under the car. When I went back to the dealership, they said I now have a leak from the crossover tube housing. Please note, I had no prior leaks... and now they want another $600+ to fix. I am convinced that any damage was caused by what they during the above repairs. Any insight?