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Registered
Join Date: Mar 2004
Location: Leesburg, Georgia, USA
Posts: 1,701
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Jim, that plastic air duct connects the heat exchangers from the engine exhaust to the engine compartment electric motor driven blower fan located on the left bank (cylinders 1-3) of the engine. You probably don't have this electric fan on your 77, thus the air duct was removed from the 3.6 power plant. The fan is used for cabin heating as well as additional engine cooling which explains the NTC temp sensor in the air duct. The CCU controls the fan operation on a 964.
A 77 with a 3.6 must be nice to have.
If you need more info, just search "rear engine blower or fan" here.
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1993 964 C2 still makes me smile
Retired and work as needed as a pain in the **s.
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