At high speeds the vacuum in the cylinder(s) is sucking it out. At least that’s what’s suggested in a number of places I saw references to the problem. However, I find this a bit weird, since if the head gasket is failing I would expect pressure to escape as well, meaning your cooling system would be pressurized and you would see some signs of oil or combustion gasses in the coolant as well.
-D > On Dec 4, 2018, at 9:33 AM, Bob Rentfro via Mercedes <mercedes@okiebenz.com> > wrote: > > It’s a 2.5. I smelled a little coolant smell this morning when I made it to > the parking lot but I attributed that to the FULL reservoir. > > How does one test for this because I see no visible indications of leaking or > weeping. > > Bob R > > Sent from my iPhone > >> On Dec 4, 2018, at 7:05 AM, Dan--- via Mercedes <mercedes@okiebenz.com> >> wrote: >> >> You don’t say what engine is in the car, but the 2.5 liter engines are known >> for head gasket leaks that only manifest themselves at highway speeds. >> >> After a highway run and a low reservoir I would be sniffing the exhaust for >> coolant. >> >> -D >> >>> On Dec 4, 2018, at 8:58 AM, Bob Rentfro via Mercedes >>> <mercedes@okiebenz.com> wrote: >>> >>> I’ve been sorting this 2004 Outback and I’ve been struggling a little with >>> the cooling system. When I bought it from a 23 year old dude called Warren, >>> the coolant was barely in the filler neck and the reservoir was empty. On >>> the test drive I heard the water sloshing sound behind the dash which I >>> reckoned was a poorly filled and vented/burped system. >>> I drove it 23 miles home, thru town, temp remained perfect but I could hear >>> sloshy slosh periodically. When I got home the coolant was still in the >>> filler neck and the reservoir was empty. I filled the reservoir to the >>> correct level. Next morning, levels good, still heard sloshyness and I took >>> off on my 40 miles freeway drive to the old nuke plant. Set the cruise to >>> 78. Temp held perfect. >>> When I went off the cruise in preps to exit, the temp climbed to almost >>> hot. I shut it off to be safe. I let it sit for 15 minutes and, upon >>> starting, was at the hot hash mark (not red) but, in 10 seconds, it dropped >>> to almost normal. I drove the last 8 miles with it fluctuating between half >>> and 3/4 temp. >>> Came out 10 hours later to drive home and checked level...coolant in the >>> neck and none in the reservoir. Placed the reservoir at correct level and >>> drove home on the back roads (top speed 60, lots of speed changes, many >>> stop signs) and temp never moved off of half. Checked level post CrossFit >>> and it was in the neck but none in the reservoir. (Oh, and there are no >>> leaks anywhere) So I place the reservoir at the correct level and >>> proceeded to drive it for two days...around town and two 25 mile trips on >>> the freeway and tIt’s a 2.5. I smelled a little coolant smell this morning >>> when I made it to the parking lot but I attributed that to the FULL >>> reservoir. > > How does one test for this because I see no visible indications of leaking or > weeping. > > Bob R > > Sent from my iPhone > >> On Dec 4, 2018, at 7:05 AM, Dan--- via Mercedes <mercedes@okiebenz.com> >> wrote: >> >> You don’t say what engine is in the car, but the 2.5 liter engines are known >> for head gasket leaks that only manifest themselves at highway speeds. >> >> After a highway run and a low reservoir I would be sniffing the exhaust for >> coolant. >> >> -D >> >>> On Dec 4, 2018, at 8:58 AM, Bob Rentfro via Mercedes >>> <mercedes@okiebenz.com> wrote: >>> >>> I’ve been sorting this 2004 Outback and I’ve been struggling a little with >>> the cooling system. When I bought it from a 23 year old dude called Warren, >>> the coolant was barely in the filler neck and the reservoir was empty. On >>> the test drive I heard the water sloshing sound behind the dash which I >>> reckoned was a poorly filled and vented/burped system. >>> I drove it 23 miles home, thru town, temp remained perfect but I could hear >>> sloshy slosh periodically. When I got home the coolant was still in the >>> filler neck and the reservoir was empty. I filled the reservoir to the >>> correct level. Next morning, levels good, still heard sloshyness and I took >>> off on my 40 miles freeway drive to the old nuke plant. Set the cruise to >>> 78. Temp held perfect. >>> When I went off the cruise in preps to exit, the temp climbed to almost >>> hot. I shut it off to be safe. I let it sit for 15 minutes and, upon >>> starting, was at the hot hash mark (not red) but, in 10 seconds, it dropped >>> to almost normal. I drove the last 8 miles with it fluctuating between half >>> and 3/4 temp. >>> Came out 10 hours later to drive home and checked level...coolant in the >>> neck and none in the reservoir. Placed the reservoir at correct level and >>> drove home on the back roads (top speed 60, lots of speed changes, many >>> stop signs) and temp never moved off of half. Checked level post CrossFit >>> and it was in the neck but none in the reservoir. (Oh, and there are no >>> leaks anywhere) So I place the reservoir at the correct level and >>> proceeded to drive it for two days...around town and two 25 mile trips on >>> the freeway and temps and levels stayed perfect. >>> I checked level last night and the levels were perfect. Drove on the >>> freeway to work this morning and, when I slowed down to exit, it got hot. >>> Shit. >>> I let it cool off and drove it the last 8 miles in. I checked level when I >>> got to the parking lot, and the reservoir is FULL. Jeez. WTF. >>> >>> Bob R >>> >>> >>> Sent from my iPhone >>> _______________________________________ >>> http://www.okiebenz.com >>> >>> To search list archives http://www.okiebenz.com/archive/ >>> >>> To Unsubscribe or change delivery options go to: >>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>> >> >> >> _______________________________________ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
