Question about 1989 Mercedes-Benz 300-Class
Car runs perfectly fine when the heater is off but, as soon as I turn the heater/ac on the engine dies.
Assuming your charging system is working properly-You probably have an idle speed control problem. Behind the battery there is an over voltage relay with red top and a 10 amp fuse in it. This relay powers the a.b.s. and the idle speed control unit. Make sure fuse is o,k, and that the relay is not corroded. Next there is 2 micro switches on the throttle linkage(you will have to remove the air cleaner. This switches are tested with an ohm meter and show continuity in one position and open in the other(don't worry if the ohm reading is high).Next to the over voltage relay there is 2 black relays(one fuel pump the other is climate comtrol) The one that says klima is the climate control. Make sure it is not corroded and a lot of times the electrical connector gets bowed and you will lose contact. This relay is really more of a control unit and gives input to the idle and c.i.s. control units as far as the a/c and heater operation. Hopefully I have been helpful
Posted on May 30, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Nov 23, 2015 | Cars & Trucks
Mar 16, 2014 | 2005 Saturn VUE
Jun 05, 2011 | 2004 Chevrolet TrailBlazer
May 12, 2010 | 2006 Chevrolet Equinox
Jan 10, 2010 | 2003 Chevrolet TrailBlazer
Oct 30, 2009 | 1987 Suzuki Samurai
Dec 03, 2008 | 2002 Chevrolet TrailBlazer
Nov 10, 2008 | 1998 Dodge Ram 1500 4WD
Nov 07, 2008 | 1998 Dodge Ram 1500 4WD
956 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: