No air flow thru vents

Hello, research is great for theory, but hands on inspection is what's needed for diagnosis. It appears that replacing this resistor it hasn't done anything to help you. It would be important to check the system to determine what is causing the problem you're having. If your Equinox has Automatic heating and air conditioning controls, your blower operation is controlled by the blower motor control module. This module works with your blower speed control to vary voltage to the blower motor to control blower speed. I believe this control module is part of the dash control unit. I would recommend your system be tested with proper diagnostic tools that can check and monitor body control modules ("B" modules) and check for system responsiveness. Power surges are likely due to the additional load put on an engine with the operation of the air conditioning compressor, which is in operation most of the time during the operation of the ventilation system, no matter if hot or cold air is desired. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops