1999 S70 Vacuum line on passenger side

volvooh · Post by **volvooh** » 29 Aug 2013, 08:41

Thanks for your help...this is turning into a bigger problem than I realized! It appears you are correct. There is no quick fix to remedy this problem.

Post by **rspi** » 29 Aug 2013, 08:54

No quick fix that I know of. Just replace the entire system.

Post by **erikv11** » 29 Aug 2013, 08:55

You can quick-fix the vacuum line in question and I definitely would, just get some generic 3/16 hose and run it from the intake manifold nipple to the flame trap location. Route it however you want. But you will want to do the PCV service soon.

Post by **jblackburn** » 29 Aug 2013, 08:57

volvooh wrote:Thanks for your help...this is turning into a bigger problem than I realized! It appears you are correct. There is no quick fix to remedy this problem.

Is the PCV system venting up the dipstick tube? Smoke up the dipstick at idle? The 1999 tends not to clog up *as much* as earlier models, but they still do.

If you're not getting smoke from the dipstick at anything above idle, fix the line. Remove the upper radiator hose, and run a length of vacuum line from that port on the intake manifold somewhere up above the intake manifold and over to the flame trap.

It looks like crap, but it beats taking the whole thing apart for a PCV repair that you don't need to do.

If you do have positive pressure up the dipstick tube above 1000 RPM...yeah, sorry, you're in for a whole PCV job.

Post by **abscate** » 30 Aug 2013, 03:44

The 1999 on system uses coolant to heat the OVC gasses and i suspect clogs much less than earlier model. I have inspected my V70 PVC once at 100k miles, and it was all wide open. Now at 150k, and good crankcase vacuum, no smoke, no blockage.

bw77 · Post by **bw77** » 30 Aug 2013, 05:16

I replaced the vacuum hose on my 99 S70GLT last year.

https://www.matthewsvolvosite.com/forums ... 0&p=257927

Post by **mikealder** » 01 Sep 2013, 04:10

The guide I wrote Here covers PCV replacement on the same engine type as the OP has, it might offer some clues as to where the pipe should go.
Note the large pipe assembly that the small pipe has snapped away from carries coolant and blow-by gasses, it is probably the most costly portion of the entire PCV repair, you need the small bore pipe connected to the inlet manifold to purge PCV gasses when the throttle is shut with the engine at idle otherwise you get a large cloud of smoke when you set off which isn't good for the cat or the O2 sensors - Mike