glynnliv

i recently purchased a 2002 cl500, with 148,000 miles. i have noticed water dripping from under the car, not in the front but about 1/3 of the way back. it is water only, no antifreeze. i always have the climate control on auto set at 73-76degrees F. im told this is condensation from air conditioning/heater unit. the coolant level in the car has stayed full. so it not losing water. can someone please let me know what this could be. is this common .thank you for your assistance.