1997 850 Vacuum Hose Manifold

[cn90]

That link I posted is not strictly about cost.

It is about what is best for these cars which now have more than 150K miles, and naturally any engine with 150K+ produces more blow-by combustion than from day 1.

The Volvo PN 9125598 (hose running from oil trap ---> manifold) is a piece of over-engineered junk. It has plastic pipe which usually breaks after some 40K or so. This is why I use heater hose. Let's put it this way, if someone gives this Volvo OEM PN 9125598 to me for free, I won't take it.

It is now 3 years after that mod (heater hose) and the PCV works fine, so smoking dipstick and the hose looks perfect, the bend looks fine. I don't over-analyze this heater hose mod. It works.

[davolvo]

Thank you everyone, you have been more help than you ever know! What size heater hose? Or is there not different sizes? My car has 123,000 K on it.

[erikv11]

Use either 3 feet 5/8 heater hose, or Gates hose number 28469 (or the equivalent part number form another manufacturer; any auto parts store will have this hose). They are both 5/8 inner diameter but the Gates hose has a pref-formed bend. In both cases, the mechanic will cut the hose to proper length when he does the install.

My opinion is to get the hose indicated by the part number, it will cost about $14.

[mika]

To original poster:

Before all of this ordering fiasco goes underway (which took me a few good days to figure out and understand the system and which parts I need to order)

I recommend grabbing a flashlight and start the car in the dark, have a good look and see if anything is unplugged under the manifold / around the thermostat area (within reason, I understand most of the main stuff is out of view) See if any PCV/vacuum hoses are loose/unplugged: often the culprit on an NA engine (naturally aspirated aka without turbo) is a vacuum hose on the left side by the end of the manifold can be re-connected with a vacuum coupler. Also if it is severed in half, you will hear a hissing noise and will be able to pinpoint.

I have 2 N/A s and both had this vacuum hose disconnected, it gets brittle and cracks as it is a regular old vacuum line.

[davolvo]

Thank you, I will try that when we get out of the deep freeze here.