How hard is it to replace all the vacuum hoses? TIA
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You have about two days worth (or one really long day) of work to get to the evaporator core and put everything back together again. What I did was get a connector tube and replaced the hose up until the point where it goes through the second firewall near the heater core. As you have a 1.8t, your vacuum system layout may differ slightly, but my '96 A4 and my wife's '00 A6 (IIRC) have a similar set-up using vacuum tube to engage the air recirculation valve.
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