bulletNo cold air
bulletDoes the clutch engage the compressor?
bulletNo?  
bulletfreon level low
bulletbad relay (behind the glovebox)
bulletfuse blown
bulletbad compressor clutch
bulletYes?
bullettemperature mix flap problem
bulletBroken temp mix flap arm/disconnected control wire
bulletBinding/worn/misaligned temp mix flaps
bulletBad temp mix flap control motor

 

bulletPoor cooling or varying air temp
bulletHave system pressures checked
bulletsee Townsend site/talk to the tech for interpretation of results
bulletBroken temp mix flap arm/disconnected control wire
bulletBinding/worn/misaligned temp mix flaps
bulletBad temp mix flap control motor

 

bulletFrost from vents (or on pipes)
bullet"Freeze-up" switch defective
bulletExpansion valve stuck open