A/C Light Flashing

[BigAl]

My A/C light flash then no cold air. The belt is tight and the a/c is full of freon. It only flash after driving 30 minutes. Any ideals?

Thanks!

[Filehorse]

How do you know it's fully charged?  Unless you've put a set of manifold gauges on the system you have no way of knowing what the real story is.  Sounds like a pressure sensing switch is causing the unit to trip out but you gotta put some gauges on it to know for sure.

[BigAl]

5 hours ago, Filehorse said:

How do you know it's fully charged?  

 

I saw the a/c guy tune it up with freon.  When the engine is cold, no problem. It only flashes after driving 30 minutes of driving.

[Filehorse]

You may want to think about taking it back to him if you're comfortable with his ability to troubleshoot the system.  This is going to require a level of expertise above shade tree.  Good luck and let us know what the problem was.