As a retired electronic engineer, I have had at least a casual interest in both high-vacuum and mechanically-pumped vacuum techniques.
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Recently I ran into a vacuum problem with my TIF 9100V vacuum pump while pumping down the air-conditioning system of a Volvo.? Rather than the fault being in the pump, it seems to be a leak between the isolation valve and vacuum port of the system, as when the vacuum port is capped and the isolation valve closed, the six vacuum led indicators rather quickly go out (the vacuum gauge is connected between the valve and port).
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As this pumping system is mechanically complex to disassemble, I thought it wise to ask an appropriate interest group if members have encountered, diagnosed, and solved this problem.? But searching , I could not locate any professional HVAC groups.? Thus I was led to your vacuum group.? I hope this is not off-topic for this group
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Regards,
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Bruce Hunter
Mill Valley, CA
ebrucehunter