Coolant

Hi Brian, this is Brian! Well, from what little you described you have the classic symptoms of a leaky heater core. Do you smell coolant when you run heater or defroster and-or have the windshield fog up?Not sure what they run for your year but they usually aren't too awful bad to change out. You will have some plastic housings under dash on that side to remove to get to it and chase down your hoses from motor to firewall to disconnect from core, can be a pain sometimes but with a little patience you can save high dollar shop labor charges. Eithier way not a major undertaking. Good luck and happy wrenching :D