Air has stopped blowing from vents

[teresa5davis]

I have a 1990 corsica that has recently had a a/c conversion from r12 to r134a. The air will blow cold but it doesnt blow very strong. Recently, the air has completely stopped blowing. I dont think it has much to do with the a/c itself because the compressor comes on and air still wont blow even if the control is set on vent or heater. Any ideas on what the problem may be?

[Blue Bowtie]

Welcome Aboard!

Check to see if the air has diverted to the defroster outlets on top of the dash. If so, the likely cause is a lack of vacuum to the HVAC controls. This is usually due to a vacuum line either failing or disconnecting in the engine compartment. There is also a vacuum reservoir (tank) which may be leaking. Once vacuum is restored to the controls, operation should return to normal.