Regardless, once you peg the temperature gauge, the odds are high that the thermostat needs to be replaced, UNLESS you had an air pocket in the top of the head. The late Dieseling Doctor used to say that the wax pellet in the t-stat would deform to the point that it no longer worked correctly.
I like the idea of an air pocket in the system, especially if you recently drained/filled the coolant. Need to have the nose of the car elevated, begin fill at the upper radiator hose into the engine, keep heat setting on full heat and patiently fill in as much coolant as possible. I like to burp the system by squeezing the upper radiator hose until air no longer bubble up into the expansion tank and I don't hear air gurgling around when I squeeze the hose. A good sign that you have an air pocket is a gurgling sound under the dash upon hard acceleration. Max -----Original Message----- From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Curt Raymond Sent: Tuesday, December 08, 2009 9:54 PM To: Diesel List Subject: Re: [MBZ] Thermostat behaviour That doesn't sound like thermostat to me at all. Coolant level? -Curt Date: Tue, 08 Dec 2009 19:03:14 -0500 From: Michael Esh <michael...@me.com> Subject: Re: [MBZ] Thermostat behaviour To: Mercedes Discussion List <mercedes@okiebenz.com> Message-ID: <90845282-7154-4fe8-913e-9eaeb6dce...@me.com> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Thanks for the help everyone. The coolant temp nearly pegged out, then after I played around the HVAC buttons it dropped to normal and the heater started blowing warm. Mike On Dec 8, 2009, at 11:24 AM, Dillon, Meade M CIV SPAWARSYSCEN- ATLANTIC, 53310 wrote: > Mike, > > How high is way up? I doubt they're related problems, sounds like a > monovalve failure for the lack of cabin heat (or some other problem > with the HVAC) and maybe thermostat for the overheating (over 95 deg C > is probably too hot when not in AC-season). > > Max _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
