Abiton
Omega Knight
   
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Posts: 1064
Under Bonnet, nr Abingdon
Gender:
Drives: Mk2 Golf, but the missus has a '96 2.0 'Select' woohoo!
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One pipe should be going to a source of vacuum, on, or indirectly onto, the throttle body low down, under the butterfly. (Can't remember the exact routing.)
The other should go to your Heater Bypass Valve.
If the first of these isn't connected, your heater controls won't work as intended. (That's where the 'power' comes from to move the various flaps that direct the air through/not through the matrix , and to the various vents.
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