The cycle
Compressor raises pressure → condenser sheds heat → expansion valve drops pressure → evaporator absorbs cabin heat → back to compressor. Charge must be exact.
AC service is the #1 summer profit center for shops. Know the system end to end.
Most 'no cold air' complaints are simple — low charge, failed clutch, or blend door — but require the right diagnostic order.
Compressor raises pressure → condenser sheds heat → expansion valve drops pressure → evaporator absorbs cabin heat → back to compressor. Charge must be exact.
Required on most new vehicles since 2021. Different machine, different fittings, way more expensive. Cross-contaminating systems destroys parts.
No — proper service requires recovery, vacuum, and recharge to spec. Topping off masks leaks and overcharges easily.