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Can I bypass the in-dash vacuum?

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

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Posts: 2
Joined: 22 Apr 2014, 08:18
Year and Model: 1998 V70GLT
Location: Woodbridge, VA

Can I bypass the in-dash vacuum?

Post by crazytooguy »

Hello all. On my 1997 S90, I have the classic vacuum servo leaking problem, and I'll dig into the dash and replace it eventually, but for now, the vacuum is bad enough that the heater control valve won't close all the way, dumping heat in the middle of summer. So, according to the diagram in this thread (viewtopic.php?t=82337), can I bypass all the interior control stuff (connect line 29 to line 30) and directly connect the manifold vacuum to the heater control valve? That way, I'm not heating up the interior until I can change the vacuum servo.



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