2001 Chevy impala blowing hot air.....

[Jimbob]

Checked pressures with a/c manifold gauge.
Low side 33 psi.
High side 150 psi increases to 200 psi then decreases to 150 psi.
Blowing hot air....any ideas ..?

[JohnHere]

If you truly mean hot air, then you have air from the heater mixing with the refrigerated air. If you mean ambient air, then the A/C system isn't cooling for some reason. To your knowledge, is the system all original, and has it ever been serviced?

[Jimbob]

A/C cooling not working..never been serviced , original system.
Any ideas ????...also checked for closed blend door...door fine working for cooling air....

[JohnHere]

A/C cooling not working..never been serviced , original system.
Any ideas ????...also checked for closed blend door...door fine working for cooling air....

Okay...we can rule out the blend door.

The system has never been serviced and is original, leading me to think that it is either low on refrigerant, or the control valve is malfunctioning. I believe your car has a V5 compressor with a mechanical control valve.

But even before addressing the above potential issues, first have the refrigerant recovered, which will tell you exactly how much the system contains, and then pull-out the Orifice Tube (OT). If the OT screen is clogged with black gunk and particles of plastic and/or metal, then you'll need to replace the compressor, along with the condenser, OT, and accumulator—and flush whatever remains that can be flushed.

If the OT is (hopefully) clean, then focus on having the system recovered, replacing the control valve and OT, evacuating, and recharging the system to specs.