97 850 NA air box vacuum lines

Post by **januwan** » 19 Jul 2015, 13:49

This problem has been discussed already many times but after checking few threads I still cannot figure out when to hook up the black vacuum line. It's a short line which I had to modify after noticing 90 deg rubber elbow got damaged. Now it is white with red tape and black short section.
I do not see any vacuum ports.

Could I get clear picture please. Thanks in advance.

Picture attached

Post by **abscate** » 19 Jul 2015, 14:47

Take a picture of the vacuum hose diagram under your hood and post it please

Post by **erikv11** » 19 Jul 2015, 15:08

The top of those two lines on the airbox connects around to a thin nipple the lower front corner of the airbox, near the throttle body. It is called "line #6" in this thread, there are good illustrations of the line but not one of the exact nipple.

https://www.matthewsvolvosite.com/forums ... =1&t=65002

Post by **januwan** » 19 Jul 2015, 15:59

Eric,

Your info was spot on. I would never find, it is hidden under the box near the cold air duct (see image 257). Again rubber elbow was broken and I had to improvise (see image 267).

One more time thanks a lot.

Post by **abscate** » 19 Jul 2015, 16:01

I believe the function is control of the hot air box to regulate the input air temperature.

You could close off that vacuum line in a pinch.