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Old 06-03-2000, 04:17 PM
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MikeTangas MikeTangas is offline
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Possibly a vacuum leak from a temp controlled valve. Look around the thermostat housing for a "tree" of vacuum lines and connections. That might explain why it only whistles after reaching operating temp.

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Mike Tangas
73 280 SEL 4.5
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