compresser/clutch engaged, a/c on,blower on high,full freon(have single gage fro dye freon kit)I thought the low side might be leaking because no dust cap,but the gage says full or green. I've seen other you tube video that have baught a/c manifold dual kit. Any comments before I buy the gage? Also the temperture dial in the cabin does do warm to hot heat,just no cold

 

Any CEL light? Any loose fuses, relays or ground wires?
Is the serpentine belt on ?

 

If the compressor is engaged and pumping, you need to get a set of dual gauges and check the actual pressures. Both high and low sides.
Those refill "owner use" attachments are useless if trying to diagnose AC problems.

Edit. Looking at some of the OP's other threads he started, doesn't seem like he came back to follow up those. Guess I'll wait to see if he returns.

 

And it hardly qualifies as "Front Page News" so it is moved.

 

.baught gage from harbor tools to do pressure test,shows 60 psi both high and low,while clutch turns.Earlier Freon kit showed system full.other views in you tube say the compresser is not doing it's job(Ratchets and wrenches) so discusted,I turned off both couplings and at manifold.when I took the red line off the shrader valve is stuck open just hissing away,put back dust cap,so need to replace the valve and the compresser????

 

I would fix the obvious leak first.

 

If it was only showing 60 psi then it is low on freon too. A static pressure reading (gauges hooked up, compressor off) would be around 100 psi on a full charged system.
Fix the leak and try adding some freon.