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PCV/Coolant line - to cool, not to heat(?)

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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shertzog
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shertzog

PCV/Coolant line - to cool, not to heat(?)

Post by shertzog » Wed Apr 20, 2016 4:33 pm

I've read most of the threads about the PCV, but hadn't seen this explicitly explained.

For the part from the oil separator to the PTC (with the coolant line bundled), since this goes to the thermostat, I'm guessing this is to keep the oil cool, versus to heat it (as I orignially thought - assuming it would be best to not clog the hose by keeping the vapors from condensing). I'm guessing the thinking is to get the vapors to condense and stay in the oil separator, versus moving to the PTC?

Just got some 5/8" (-10AN) Parker Push-Lok Plus (ebay, $16 for 4ft) http://www.amazon.com/Tefen-Nylon-Fitti ... ge_o01_s01 to do the heater hose upgrade (or to the top of the engine), and also got some braided stainless fuel line, 5/8 http://www.amazon.com/Upgr8-Length-Stai ... -10an+hose;
Some "Tefen" nylon 90deg. elbows https://www.amazon.com/gp/product/B006O ... UTF8&psc=1.

Since (answering my own question), the separator->PTC hose should be at least shielded from heat (are the upgraders to heater hose wrapping the coolant line around it?), I'm thinking use the stainless version there, and use an extra long coolant hose wrapped around it, and then cover the two in header tape to insulate from the block heat.

Also, the TYC headlamps are working out nicely, but now the parking assemblies are showing their age, even more dull looking and yellow now that the headlights aren't yellow ;) Also, the clips that hold them in are all breaking, and my JB Kwic repairs are not quite holding - mechanic's wire worked to hold them in place for now. I noticed they are TYC - I may see if I can find a nice set of OEM at the JY.
99 S70 GLT current project, hoping to make it new DD
97 Integra GSR (only ~135k mi, but rings are shot in #3 - rebuilding soon)
90 Camry wagon. 299k mi, DD, replacing PS hoses soon

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Re: PCV/Coolant line - to cool, not to heat(?)

Post by Sommerfeldt » Wed Apr 20, 2016 5:04 pm

It may be just me, but I don't really understand what you mean... I can't remember any coolant line to the thermostat that has anything to do with the PTC. All that goes to the PTC is the hose from the oil separator and the vacuum line from the passenger side of the manifold... right?

The PTC is there to heat vapors for a short while at start-up - I don't think the volatile parts of the crankcase pressure gases will care too much about a few degrees while the car is running - that's also why they're routed back in to burn with the rest of the dinosaur remains. The hoses are indeed shielded from heat, but I suspect that's more of an issue for the hoses themselves (especially those hard plastic lines) than for condensation reasons. I may be totally in the wrong. It's been known to happen, more than I'd like :lol: .

- S
'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.

shertzog
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shertzog

Re: PCV/Coolant line - to cool, not to heat(?)

Post by shertzog » Wed Apr 20, 2016 5:41 pm

Sorry, I'm referring to this pic:

http://www.matthewsvolvosite.com/forums ... p?id=19810

From Page 5 of http://www.matthewsvolvosite.com/forums ... 40#p305270
(Post by MMT51 » Fri Nov 01, 2013 3:42 pm)

I'm assuming that green line is coolant - I can't image a reason to run a vacuum line 1) to the thermostat or 2) bundle it with the larger hose. (?)
99 S70 GLT current project, hoping to make it new DD
97 Integra GSR (only ~135k mi, but rings are shot in #3 - rebuilding soon)
90 Camry wagon. 299k mi, DD, replacing PS hoses soon

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abscate
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Re: PCV/Coolant line - to cool, not to heat(?)

Post by abscate » Wed Apr 20, 2016 7:37 pm

The coolant line (1999 and on) actually is to keep the PVC system hot relative to air, and keep the oil in vapor to get drawn into the air snorkel vs the PTC nipple
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