Working on an old Lennox, have no model number or any labels left. The condenser is the type that has the fan on the side above the coil. Hooked the gauges up on low side and get nothing, compressor is running the lines are neither hot or cold. I do not think it has any refregerant in it at all, homeowner says they charge with freon last year twice. Anyway do not understand why no gauge pressure on low side. Started raining both cats and dogs. Going back tomorrow, would appreciate any ideas. Thanks