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Weird vacuum thing....


Guest 88gl
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Whenever I extend the throttle past a certain point, my vent controls switch to Max A/C. I know that the vent control system is run off of the vacuum system - what's going on??

 

It may be coincidence, but going past the same throttle position seems to produce a hesitation when the engine is cold also.....??????

 

Any help would be great.

 

Thanks!!

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would help to know what engine we are asking about.

But my quess is the white vacuum canister on the shelf behind the pass side sturt tower

has a bad check valve.

EZ test

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