2003 Pontiac Montana.
Question = i just wanted to know how to change  the rear brake light on my van.

Open the rear hatch. Remove the 2 screws that hold either lamp assembly.   Pop out the assembly.
Disconnect the electrical connector from the circuit  board on the back of the assembly, then remove
screws in circuit board to  remove board. Then pull out bad bulb.
Problem with my 2000 Pontiac Montana 3.4L.

Question = Why does my van not start when its cold or damp or when it sits for 8 hours or more but if i
plug the van in with block heater it will start when it does start it run a little on the rough side until the
engine warms up ,just wondering if it could be the temperature
sensor  let me know what you think thank you  

Hard starting when wet or damp outside is usually caused by corroded ignition coil  towers and spark
plug wires. Just pull them off one at a time and look for corrosion or  
rust on the coil tower and inside
the plug wire.  Plugged injectors are a common  cause  for running rough. Also the fuel pressure
regulator leaking fuel into the vacuum line will  cause a hard / no start and running rough, but damp
weather would not make a  difference.
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Pontiac Montana Rear Brake Light Bulb Replacement