Maybe do an oil analysis to see if there's any trace of coolant in the oil...
Curt Sent from Yahoo Mail on Android On Mon, Dec 5, 2016 at 1:13 PM, Jon Agne via Mercedes<mercedes@okiebenz.com> wrote: Ah yes. I forgot to mention the symptoms. 1. I started to notice that I’d need just a little coolant now and then. A pint or two now and then. 2. Occasionally on cold start-up, I’d notice rapidly rising temperature with a cold thermostat and radiator. This is being caused by an occasional air bubble. Vigorous squeezing of the top radiator hose solved this problem. 3. Occasionally on cold start-up, I’d notice that coolant was flowing out of the radiator overflow hose. Again with a cold thermostat and radiator. 4. And yes, occasionally when checking coolant when cold, I notice a slight pffft when cracking the radiator cap. I have found no trace of coolant in the engine oil. Jon > On Dec 5, 2016, at 10:38 AM, Meade Dillon via Mercedes > <mercedes@okiebenz.com> wrote: > > NAPA sells them, as do other FLAPS I'll bet, but I've never tried them. > > When I was getting the classic symptom of a pressurized coolant system that > stays pressurized overnight (The White Whale, a couple years ago), my > thought was that the head crack or failed gasket was allowing pressurized > gasses to be dissolved into the coolant when the engine was running. These > dissolved gasses are what the test strips from NAPA are designed to > detect. The gasses have effectively "carbonated" the coolant, like a can > of seltzer water, and if the coolant pressure cap is performing correctly, > it will hold the pressure in the system at 2 bar, but allow pressure beyond > that to escape. > > So, does your 250S cooling system stay pressurized overnight? > > ------------- > Max > Charleston SC > > On Mon, Dec 5, 2016 at 10:13 AM, Jon Agne via Mercedes < > mercedes@okiebenz.com> wrote: > >> Has anyone ever tried one of these? My ’68 250S is exhibiting some of the >> symptoms which would lead me to believe that there might be an exhaust leak >> into the coolant. I’m wondering if it might be time to do a top-end >> overhaul, as I know this car sat for at least 15 years. >> >> Jon >> >> >> > _______________________________________ > 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
