I have oppened the access door and you were right. The noise comes from the A/C compressor. I share your view not to let the A/C compressor turning without any fluid inside. I will disconnect the power cable of the clutch. Thanks for all your advice.
Hartwig
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.