Today I ran my AC and checked the sight glass... I got lots of bubbles until I rev'd the engine and held it (not sure what RPM but am guessing between 2500 and 3000) there. The bubbles went away until the electric fan kicked in, once it was on the bubbles reappeared. Once the fan cycled off the bubbles went away... is this normal?

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1984 190D 2.2 Auto 220k
2001 Jeep Cherokee Sport 70K
2004 Lexus RX-330 ??K
2005 Chrylser Crossfire LTD 6K

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