I cannot find the low pressure cap on my A/C, any tell me where it is at?

 

I cant recall off hand without going home to look at my truck, but the low side is the smallest sized nipple. If youre trying to refill your A/C with R134, then the connector will only fit on the low side. Facing the truck (on my 98 F150 with a 5.4L) it is on the left hand side.

 

Left hand side, great I'll concentrate my efforts on that side.. I just want to check the pressure make sure it's got a full charge, gettin hot around here

 

On the accumulator, passenger's side of the engine bay, underneath the alternator and starter megafuses and the two or three junction connectors.