95' Chevy Suburban: it has front and rear A/C
My a/c air not cold at all I do need some advice please.
A/C on - compressor clutch engage and stay engage, the inlet at accumulator not cold at all, but the another tube A/C evaporator are cold.

I'm learning how to working my A/C thank you for all the help I can get. Oh I do have vacuum pump, If need I can vacuum the system,
Pickup new manifold gauge set, and here the reading:
With the engine off
LOW size: 110 PSI
The gauge has R134a reading too: +33
High size: 100 PSI and R134a: +33

With the engine runing
LOW size: 25 PSI and R134a: -4
High size: 150 PSI and R134a: +45

low pressure switch... passenger side firewall should be an aluminum canister with a screw in switch.. tap on it with a screw driver and see if it unsticks it...

Low on Freon.

I know there is a leak some where in that a/c.
Is any body have leak detectecor? I realy do need some help to detect the leak come from, so I can replace it.

Look for oily hoses, oil residue on the condenser and around the compressor body.