SOURCE: OBD code P0499, P0499 NVLD Canister Vent Valve Solenoid, Cause?
its above ur fuel tank from what i kno of but it could be ur canister or just a short in the wire to ur solenoid
SOURCE: 2007 Chevy Uplander Rear Overhead A/C Vents Won't Work
Have you checked the Aux switch near the bottom of the center control console.
There should be a knob with: Aux, Off, 1, 2, 3. This is the switch for the rear AC blower.
If the driver wants to control the rear AC, use the 1, 2, 3 settings.
If you put it on Aux, Than the rear AC is controlled by the passenger in the back seat using the extra controls located on the Overhead DVD player. (The front AC must be on the rear to work)
SOURCE: * Faulty vent valve
you will have to replace the evap vent valve for the emisions system usually located at the charcoal canister under the vehicle near the fuel tank.
SOURCE: getting an error code of PO449 for a check engine
You are right. You need the vent valve not the purge valve. The vent valve is a dealer item. Also this is a common problem and GM has released a bulletin on this that involves moving the location of the valve and running some new lines. It comes as a kit from GM, and it costs about a 100 bucks.
SOURCE: My 2003 chevy silverado 1500
The first thing I would check is the fuel cap. Your vehicle uses a closed vent system to control the fuel vapors in the tank and then vent the vapors to the engine intake system to burn. so you have a leak either your purge/ vent solenoid is stuck or open all the time not allowing the on board diagnostics to run the test or you may a bad fuel cap, and it is venting to the atmosphere allowing the gross leak. The purge/ vent valve is under the vehicle next to the charcoal canister.
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