[chuckb]

I have a 08 liberty and when you start the car about half the time the ac won't blow cold but if you turn the ignition off and re start it the ac will blow cold about half the time ! Any ideas

 

[ImperialCrown]

Welcome to Allpar. There are a couple of TSB's (technical service bulletins) addressing erratic HVAC operation that involves reprogramming a control module. I think that by cycling the ign switch, you are resetting the module.
http://cs.dodge-club.net/graphics/manuals/24/18-027-0820R.pdf
http://www.wkjeeps.com/misc/KA/TSB/TSB_Nitro_2400708a.pdf