On the passanger's side is where the heater core, blower motor. Are located. They are in a large plastic housing which is all part of the HVAC system. The housing attaches to the firewall of the vehicle and it has a rubber material around it that is used to seal off outside air. Chances are either the seal has failed or was never installed correctly. That is where I would start, but it isn't an easy job.
Let me know if you have other questions, and thanks for using to 2carpros. Com.
Joe
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Saturday, January 9th, 2010 AT 8:47 PM