AC delay before cold air - mean anything?

[davepl]

Took my truck for the first spring drive a week or so ago. About 20 minutes into the drive I started getting warm, so fired up the AC. It blew hot air at first, and then about 20 seconds later it got cold.

My -hope- is that maybe the heater control valve wasn't closed so it had to flush the heat out of the heater core before it could make cold air.

Or, maybe I've got a leak and being low on refrigerant will cause this... basically, that's my concern, whether or not a delay before cold is produced could signal anything about the system.

It clearly didn't ALL leak out if it did leak at all, because it worked pretty well once it had some time to catch up.