1994 Ford Explorer Air

Yes it very well could be low. If the pressure is too low or too high it wont be cold. On the left side as you face the truck there should be a blue cap near the condencer (big silver thing) that is the low side. With the truck running hook a gauge to it and see what it reads. They sell a refill can PROVIDED IT'S R134 that comes witha guage. Usually aroun 30-40psi is what you want. If your unsure take to a TRUSTED mech. But usually it's a simple fix.