In a message dated 4/21/2008 3:50:14 P.M. US Mountain Standard Time, [EMAIL PROTECTED] writes:
1. The temp gauge usually holds at 100 or a degree or two above or below. It has started to register hot for a time every few miles, starting in the last few months. I have had the thermostat replaced, radiator flushed and the temp sensor replaced [old one was a bit corroded], and this morning when it jumped up to 120 I headed back to the shop and a temperature sensor showed nothing on the engine or cooling system over 180 while the gauge was at 119. Sometimes it jumps [like an air bubble] and sometimes it climbs and goes back down slowly. Tomorrow the cluster will be pulled and the resistance on the wire checked, as well as the vacuum lines. Any other thoughts ? Bill, Probably a corroded connection. Start by unplugging the connector at the driver's side of the cylinder head, and watch the gauge. There are two senders in the 2-3 cylinder area of the head i believe. Push the connector on and off a few times and see if the temperature reading becomes more accurate. A little known connection on the back of the glow plug relay is next. The wiring harness for the temperature sender is the same one that contains the wiring for the glow plugs. So the glow plug relay becomes a connection point for your sender. Same drill--unplug it and replug it a few times to remove the tarnish on the contacts that Mercedes silver is famous for. Do not sand the contacts! If these two points have not fixed the problem, NOW you can pay someone to remove the instrument cluster, which also has a circular push on connector on the back. I bet it is the one on the GP relay, since you recently changed the sensor. You changed the correct sensor--right? Good luck, Jim Friesen Phoenix AZ 79 300SD, 264 K miles 98 ML 320, 155 K miles **************Need a new ride? Check out the largest site for U.S. used car listings at AOL Autos. (http://autos.aol.com/used?NCID=aolcmp00300000002851) _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
