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Have you looked around the engine compartment? Many vehicles have a sticker with the vacuum diagram on it somewhere there (usually on top of the radiator mounting frame, but sometimes on a fender well).
what year is your truck and does it have autotemp,First thing to check is open the hood and locate the heater hoses,where the heater hoses pass thru the firewall should be a small plastic vacume line follow this back to the engine and make sure its not broke or disconnected from vacume source
P0411 Secondary Air Injection System Incorrect Flow Detected p0411 is a generic code, probably a vacume leak,vacume hose broken check this first, check the air pump turn on the car but it needs to be cold, you should hear a high pitched whine, this is the air pump running,there are 2 hoses one suction one blowing thishose should be going from the air pump to the air cleaner disconnect that and see what the volume is should be pretty strong. But mostly you probably have a broken vacume line somewhere
sounds like your blend door is loosing vacum check for melted or disconnected vacum hoses (most are plastic) the blend door is controled by one black and one black w/green stripe. As for the e break check for connection or cracked or worn hose end
lift hood while running and lisen for a vacum leak and check all vacum hoses. if you dont find a vacum leak then replace the idle air cotrol valve. if the check engine light is on then make sure the code is not for the throttle position sensor. if so then replace the throttle position sensor.