Porsche 1972 911 Workshop Manual page 205

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R E M O V I N G A N D I N S T A L L I N G REGULATOR H O U S I N G
R e m o v i n g
1. Detach hot air hose between left heat
exchanger and regulator housing, then
remove hose between regulator housing
and air cleaner intake.
I n s t a l l i n g
Adjust fresh air flap (see page 2.1-1/2).
C H E C K I N G O P E R A T I O N OF I N D U C T I O N AIR P R E H E A T I N G S Y S T E M
1. Hot air flap must be open when engine is
cold. This can be checked through the
bypass hole in the regulator housing. The
hot air flap closes the bypass duct and stays
in place under spring tension.
2. Remove 3 retaining bolts from left velocity
stack and remove regulator housing.
S e r v i c i n g

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