Ted & Joe,
There are two more areas to check. Joe, you said you just changed the vanes on the compressor. Did you scrape the old gasket off the muffler box? The gasket looks like an apple cut in half. If so, make sure it is not pinched or pushed or buldging out.
Second area to check would be the lines that connect from the compressor to your weighted tubing. Those fittings are known for either melting under higher temps or at least becoming loose and alowing some air to escape.
Otherwise, I agree with Bill about when to start your system, just after ice-off.
