P0446 Evaporative Emission Control System Vent Control Circuit Malfunction. The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP).
https://www.obd-codes.com/p0446
SOURCE: sluggish engine pontiac g6
Sounds like a transmission issue, have the car scanned for ant transmission related codes. Most transmission shops will check to make sure your transmission is working 100% free of charge. With what you have described, almost sounds like you don't have 1st or 4th gear and your transmission is running on 2nd and 3rd gear. Easy fix if the 1st-4th solenoid needs to be replaced, or the wire harness has gone bad. Start with getting your car scanned and let me know if your transmission is starting on 2nd. Good luck
SOURCE: the heater in my 2008 pontiac G6 doesn't work how do i fix it
Is the fan blowing for the vents? If not the problem is a fan issue which is much more likely. The hot water usually goes through the heater core all the time and the only reason you get heat when called for is that air is directed across the fins and coils where your engine coolant is going through. Of course the heat does not come on until the engine has heat built up in it say after about 7 minutes of run time depending on ambient temperature.
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