20 Most Recent 1994 Mercedes-Benz S-Class - Page 5 Questions & Answers

I had same problem with my 1994 SL600. Also when this happens you will lose your interior door lights when you open the doors. My problem was solved by taking out the, A-white 40 amp 12V Relay and cleaning off the 6-prongs and reinstalling. It is located in the box underhood ahead of the main fuse box. Just need a phillips screwdriver. It is the fartherest relay in back left. I had to pull the one out in front of it to be able to remove the white one. You can hear it click when you push in dooropen switch. When working right you do not hear it. Hope this helps.

The engine is kept cool by a liquid circulating through the engine to a radiator. In the radiator, the liquid is cooled by air passing through the radiator tubes. The coolant is circulated by a rotating water pump driven by the engine crankshaft. The complete engine cooling system consists of a radiator, recovery system, cooling fan, thermostat, water pump and serpentine belt.

Check the coolant level in the recovery bottle or surge tank, usually mounted on the inner fender. With the engine cold, the coolant level should be at the FULL COLD or between the FULL HOT and ADD level. With the engine at normal operating temperature, the coolant level should be at the FULL HOT or HOT mark. Only add coolant to the recovery bottle or surge tank as necessary to bring the system up to a proper level. On any vehicle that is not equipped with a coolant recovery bottle or surge tank, the level must be checked by removing the radiator cap. This should only be done when the cooling system has had time to sufficiently cool after the engine has been run. The coolant level should be within 2 in. (51mm) of the base of the radiator filler neck. If necessary, coolant can then be added directly to the radiator.

While you are checking the coolant level, check the radiator cap for a worn or cracked gasket. If the cap doesn't seal properly, fluid will be lost and the engine will overheat.

Worn caps should be replaced with a new one.

Periodically clean any debris; leaves, paper, insects, etc. from the radiator fins. Pick the large pieces off by hand. The smaller pieces can be washed away with water pressure from a hose.

Carefully straighten any bent radiator fins with a pair of needle nose pliers. Be careful, the fins are very soft. Don't wiggle the fins back and forth too much. Straighten them once and try not move them again. It is recommended that the radiator be cleaned and flushed of sludge and any rust build-up once a year. If this has not been administerd withn the stated time, this may be why your veihicke is overheating at this time. Have the Radiator flushed asap if this is the case.

Now, if the coolant level is proper and, the cap is in fair or good condition, i would advise to move in the direction of the cooling fans and sensors as well. These fans are vital to the cooling process as well. The cooling fans must cycle in intrevals to keep the coolant cool during stop and gp driving or, long idle. They are also very important during the operational period of the AC durign trale as well. i recommedn inspecting the cooling fans while the engien is running. they shoudl cycle during the running period. if thsi is not the case, you will need to test the operational value of these devices. The test procedure follows below


TESTING


1. If the fan doesn't operate, disconnect the fan and apply voltage across the fan terminals. If the fan still doesn't run, it needs a new motor.

2. If the fan runs, with the jumpers but not when connected, the fan relay is the most likely problem.

3. If fan operates but a high current draw is suspected continue with the following ammeter TESTING.

4. Disconnect the electrical connector from the cooling fan.

5. Using an ammeter and jumper wires, connect the fan motor in series with the battery and ammeter. With the fan running, check the ammeter reading, it should be 3.4-5.0 amps; if not, replace the motor.

6. Reconnect the fan's electrical connector. Start the engine, allow it to reach temperatures above 194°F and confirm that the fan runs. If the fan doesn't run, replace the temperature switch.



Ok, Now we will move on to the next possible issue. The water pump. ok, due to the fact that your pump is driven by the drive belt, you will need to start the engine and listen for bad bearing, using a mechanic's Stethoscope or rubber tubing.

* Place the stethoscope or hose on the bearing or pump shaft.
* If a louder than normal noise is heard, the bearing is defective.

Replace the pump in this case.

You will also notice leakage around the pump housing if the seal has failed as well. this will strain the impeller and, ruin the pump.

Now. the last area of concern will be the thermosta. this is the most common issue that will inflict overheating in many vehicles. The thermostat is used to control the flow of engine coolant. When the engine is cold, the thermostat is closed to prevent coolant from circulating through the engine. As the engine begins to warm up, the thermostat opens to allow the coolant to flow through the radiator and cool the engine to its normal operating temperature. Fuel economy and engine durability is increased when operated at normal operating temperature.


There are several ways to test the opening temperature of a thermostat.

One method does not require that the thermostat be removed from the engine.

* Remove the radiator pressure cap from a cool radiator and insert a thermometer into the coolant.
* Start the engine and let it warm up. Watch the thermometer and the surface of the coolant.
* When the coolant begins to flow, this indicates the thermostat has started to open.
* The reading on the thermometer indicates the opening temperature of the thermostat.
* If the engine is cold and coolant circulates, this indicates the thermostat is stuck open and must be replaced.

The other way to test a thermostat is to remove it.

* Suspend the thermostat completely submerged in a small container of water so it does not touch the bottom.
* Place a thermometer in the water so it does not touch the container and only measures water temperature.
* Heat the water.
* When the thermostat valve barely begins to open, read the thermometer. This is the opening temperature of this particular thermostat.
* If the valve stays open after the thermostat is removed from the water, the thermostat is defective and must be replaced.
* Several types of commercial testers are available. When using such a tester, be sure to follow the manufacturer's instructions.
* Markings on the thermostat normally indicate which end should face toward the radiator. Regardless of the markings, the sensored end must always be installed toward the engine.
* When replacing the thermostat, also replace the gasket that seals the thermostat in place and is positioned between the water outlet casting and the engine block.

* Generally, these gaskets are made of a composition fiber material and are die-cut to match the thermostat opening and mounting bolt configuration of the water outlet.
* Thermostat gaskets generally come with or without an adhesive backing. The adhesive backing of gaskets holds the thermostat securely centered in the mounting flange, leaving both hands of the technician free to align and bolt the thermostat securely in place.

The best solution is this. Open the remote take the batteries out. You then pop the two sides off, or if you have the screw type you can do it that way. once you have it open, then all you have to do it USE alcohol to clean the board with a old toothbrush. use a hair dryer to dry it out and let it sit near a fan or sunlight for about 1-2 hours, someplace the air flows. snap it back together a nd presto, you dont need to replace it. I did the same thing 2 months ago, and I deal with electrical items every single day.. the most important thing is to rinse it with Clean water distilled prefered to make sure there is no pesty chemicals from the city water. thats what messes it up!!!!.. good luck

if you hav a remote control key &yr car wont respond . change key batrrey &contact dealer if still dont work for software

Lights will turn on even on a weak battery. Take your battery to a parts dealer and let them test it for you. Recharge on a slow charge or replace.

problems not related, try replacing the stage pistons on your tranny. Get from buymbparts.com or autohausaz.com. If that doesnt do it you need transmission work. Sounds like your strip fuses and fuses need to be replaced due to corrosion at the terminals. also pull out the gage cluster and clean the corrosion off the grounding point.

It's the amp.

it is some benz models where built to be self sufficient try looking on www.haynesrepairmanuals.com

From what you said the car goes to LIMP HOME mode and that is ASR issue that can't be solved by connecting your car to the computer and having the issue pinpointed. ASR can't be tested.You will have to replace engine wiring harnes FIRST part # 140 540 47 05 buy on line or on EBAY cost is about $610.00, check the performance of your car, if you lucky then this it. But from my experience next to replace is a left ETA (if not two of them) to fix this problem they are VERY EXPENSIVE about $4000.00 ea. ETA Left # 000 141 72 25 and right # 000 141 39 25. Word of advice DON"T BUY ANY OF THE ABOVE MENTION PARTS USED, remove your own ETA's from the car and call BBA Remanufacturing Inc. @ 866-573-2740 (www.bba-reman.com) they can rebuild your own ETA's at about $300.00 ea plus shipping.The work is guaranteed. After replacing above parts the car will run like new. No ASR issues for next 10-15 years. So far I find this as a number one issue with Mercedes S600. Good luck.

there is away to switch off the rear doors from the front door but you cant single out a door.

sounds like you have a wiring problem in the main lock switch in the driver side door or wires that run from there to the other doors. one of the wires in this system does not have a good enough connection to allow enough current to operate the locks. put another way, the wire itself is introducing unwanted resistance which reduces the current flow. the resistance could be a result of a poor connection at a junction or a section of wire which has corrosion or some other problem which diminishes flow. to find exactly where the problem lies will involve removing door inner panels and making voltage drop tests across connections. works something like this: i started out with 12v dc, i know this component should use 3.4 v (or whatever it is) but now i only have 4 v coming to this next component. so the wire is using some of the voltage. some drop in the wire is normal, but not very much. that is how i would troubleshoot it. you can just check the connections to power and ground, just look at things and make sure you don't see corrosion, wiggle connections and see if it makes something different happen, but you will still have to take the doors apart to do it. hope that helps

OdometerGears.com has the replacement gear for you to repair your odometer. They also have a how to http://www.odometergears.com/subpages/140_Speedometer_Repair.html
The two gears that are in your odometer are E15=15 tooth gear and a 12 tooth small pod. The two gears including shipping is $54.00

bad ground or the wiper motors getting hot bushing might be on the way out

crank sensor,cam sensor,ignition module,coil pack,or the computer itself

hello,good day,try to check all the fuse,if not,many part are related to this problem,such as engine wiring harness,idling actuator,sensor,air mass,better to send to your dealer to diagnose properly,ty

it is locates on the left side of the engine block by the distributor cap,if ur car engine is the 119.971 .140 body style

I also had the ASR light on and no power. It was the throttle actuator not working properly. I did a tune-up and the problem went away.

hello,good day,you have a 119 engine v-8,yes 2 hose tobe remove and 2 bolt holding the pump,try to memorize or draw the rotation of your fan before remove,you can do it,it"s upper part of your engine,ty

hello,check your fuse box for busted fuse,or you can remove the plastic cover in rear end in engine room,air filter and aircon motor can check for free movement,as well the blower regulator on top of blower,ty

hello,have you check your wiper relay located on top of main fuse box,maybe poor contact,or your combination switch for wiper have worn-out mechanism,or your wiper motor need tobe check the condition,ty