I have a 2008 chevy colorado with a 3.7 and I want to install a block heater and can't find the soft plug. They say it's on the drivers side put can't locate the brass plug. I have one on the passenger side of engine that is alumiun plug. Is there anyone out there that can help find where it would go. Thanks. I love my 2008 colorado and sure hope the 5 cylinder engine will be a dependable. I was not sure if I should buy this truck with that 5 cylinder. Does anyone have any input on this engine. Thanks