How to Change a Fuel Pump Relay

1. Disconnect the cable from the vehicle battery's negative terminal to shut off the power. Disconnecting the positive terminal is also a good precaution.
2. Open the hood and check inside the fuse box in the engine compartment. The fuel relay is located here on most cars. Check the underside of the fuse box lid for a diagram showing the fuses/relays in the box and their locations. If the relay is not in the fuse box, check the manual or with your mechanic.
3. Remove the fuel pump relay, which is a cube-shaped object that connects with prongs like an electrical plug. Disconnect the plug-in (and fuse, if needed) to the relay to remove it. If the relay is within the box, pry it out carefully with the help of a flathead screwdriver.
4. Use the old relay as a guide to get the correct replacement at an auto supply store. A new relay can range in price from $12 to $45. Some relay brands can be more reliable than others. Check with a store specialist for the best relay brand for your vehicle.
5. Install the new relay into place in the vehicle. Reconnect the plug-in, fuse and any other connectors. Reconnect the battery cables.
6. Repressurize the fuel system, as it should have depressurized after removing the relay. Make sure the gas cap is secure, then turn the ignition on for 2 seconds and shut it off for up to 10 seconds. Repeat at least 5 times; the recommended number can vary, depending on the vehicle.

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How to Operate the Sunroof in My 1984 Mercedes Benz 300 SD

1. Place the key in the ignition and turn it to the second or third position. The first position is the accessory position, while the second position illuminates the glow plug indicator light. Turning the key to the third position actually starts the vehicle, but should be done only after the glow plugs have sufficiently warmed up and the indicator light is no longer illuminated.
2. Locate the sunroof's power switch. The sunroof switch is located in the center stack directly below the air vents and above the climate control buttons. The sunroof switch is the second button from the left and directly to the left of the hazard light switch.
3. Push and hold the top section of the sunroof switch to open the sunroof. Close the sunroof by pushing the bottom half of the sunroof switch. While you must hold down the switch to open it, closing the switch is done by merely pressing the switch. However, due to age you may have to still hold down the switch to fully close the sunroof; this indicates that the sunroof is not operating within factory specifications.

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How to Replace the Thermostat on the 3.1 Grand Prix

1. Pull the Grand Prix with the 3.1-liter engine into a safe and level work area. Set the emergency brake and open the hood. Shut the motor off and wait two to three hours for the engine to cool down completely.
2. Slowly unscrew the radiator cap and set it to the side. Make sure that the cap is not hot and does not have pressure on it. Slide the drip pan underneath the radiator drain plug on the bottom of the radiator. Loosen the drain plug with the pliers and allow a couple of gallons of coolant to drain into the drain pan. Tighten the drain plug back down tight.
3. Locate the top radiator hose that connects to the top radiator port and the intake manifold. The other end of the radiator hose connects to the thermostat housing on top of the intake manifold. Unscrew the hose clamp from the end of the hose that is attached to the thermostat housing port with the pliers. Pull the clamp back onto the hose. Twist and pull the hose off the thermostat housing port.
4. Unscrew the two thermostat housing mounting bolts with a ratchet and a socket. Pull the housing off and set it to the side. Pull the thermostat out of the intake manifold and discard it into the drain pan. Scrape away any of the old gasket from the base of the intake manifold and the bottom of the thermostat housing. Wipe away the excess gasket, dirt and debris from both places with a clean rag.
5. Spread a thin line of the red high-temperature silicone around the bottom of the thermostat housing. Push the gasket onto the bottom of the housing so that the silicone will hold the gasket in place and act as a extra sealer. Make sure that the bolt holes are matched up on the gasket and the thermostat housing.
6. Set the thermostat housing back over the intake manifold and match the bolt holes up. Screw the two mounting bolts through the thermostat housing and tighten with the ratchet and socket.
7. Push the top radiator hose back over the thermostat housing port and line the hose clamp over the radiator hose and the port. Tighten the clamp with the screwdriver until the hose is securely tightened to the thermostat housing port.
8. Add the antifreeze to the radiator until it is full. Leave the cap off the radiator. Crank the motor and let the engine heat up until the thermostat opens. The thermostat generally opens around 180 degrees. When the thermostat opens, the antifreeze level will drop inside of the radiator. Keep adding more antifreeze to the radiator until the antifreeze stabilizes at the top of the radiator cap. Screw the cap on tight and turn the engine off.

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How to Replace a Thermostat on a 1997 BMW 528i

1. Take the thermostat housing cover off by removing the two mounting bolts that holds the cover onto the 528i intake manifold. The cover is located on the top of the engine directly to the right of the throttle body. It's connected to the radiator hose.
2. Pull the thermostat out of the intake manifold of the BMW by pulling up on it. The thermostat rests on a machined-lip inside of the manifold. It is not permanently attached to the engine so it can be pulled out. Once the thermostat has been removed, scrape the old gasket off of the manifold with a small scraper. Do not get any gasket material into the hole. This can cause blockage in the coolant system. Press a shop towel into the hole and remove it once the gasket has been removed.
3. Set a new gasket into place and put a new thermostat into the intake manifold. Once in place, bolt the thermostat housing cover back into place using the original bolts that were previously removed.

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How to Reset the SRS Light on a Mercedes

1. Locate the fuse panel cover and remove it. This is located on the lower left side of the control panel on the driver's side of the car. Find the port that fits the OBD cable and plug the scan tool's cable into this port.
2. Put the key into the ignition and turn it to the 'Run' position. This is the position just before the engine starts. Look at your OBD scan tool and write down the codes it displays.
3. Check your owner's manual for what the codes mean.
4. Unplug the scan tool and put the fuse panel cover back in place. Take your vehicle to your local Mercedes dealer to have repairs made, if needed.
5. Repeat step 1 when you return home. Put the key into the ignition and turn it to the 'Run' position. Wait until the SRS light turns off. Remove the cable and put the fuse panel cover back in place.

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My Mercedes E320 Won#039;t Start: Troubleshoot

1. Insert your key into the E320's ignition and turn it. Listen for a 'clicking' noise. If you hear the clicking noise, you will need to have the car towed to a garage to have the alternator replaced.
2. Look at the fuel gauge while the key is in the ignition. Add gas to the car if needed and then try to start the E320.
3. Open the E320's trunk and locate the battery. Make sure that the battery terminals are connected to the battery properly. You can tell this by the '+' and '-' signs on the terminals and the connecting wires.
4. Connect jumper wires to the '+' and '-' terminals on your battery and then connect the other end of the jumper wires to a different car battery. Start the other car with the wires connected and then try to start your car.
5. Leave the E320 running for about 15 minutes to allow the battery to charge. Turn the E320 off and wait for a couple of minutes. Start the E320 again. If the car will not start, you need to replace the battery.

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How to Bleed the Radiator for an E39

1. Park the car in a well-lit area on a flat surface. Bleed the system when the engine is cold. From inside the car, turn the ignition key to the 'On' position. Use the climate controls to set the interior heat to 90-degrees and turn the fan to the lowest setting.
2. Open the hood. Remove the cap on the radiator expansion tank. Unscrew and remove the bleeder screws on the thermostat cover and expansion tank with a screwdriver.
3. Pour coolant (50/50 BMW coolant and distilled water) into the expansion tank until the tank is full and coolant flows bleeder hole on the thermostat cover. Continue pouring coolant into the expansion tank until the coolant that is coming out of the bleeder hole does not have any air bubbles. Install the bleeder screw and tighten it until the bleeder is closed.
4. Fill the expansion tank again to the very top. Continue filling it until the coolant that is coming out of the expansion tank bleeder screw has does not have air bubbles. Make sure that the expansion tank is full to the top during this process. Install and tighten the bleeder screw. Check that the expansion tank is full. If it is not, fill it to the top and then install the cap.
5. Drive the BMW until it is up to temperature, which will around ten to 15 minutes. Rev the engine to higher RPMs as well once it is warmed up.
6. Park the car and turn off the engine. Let the engine cool down completely, which will take several hours. Check the level of coolant in the expansion tank. If the tank is empty repeat the bleeding process. If the tank is low, fill it to the top level indicated on the expansion tank. Check the coolant level after the next few times the car is driven to make sure it is still full.

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DIY: How to Replace S500 Brake Pads

1. Loosen the lug nuts with the lug nut wrench. Do not remove them completely. Place the jack under the front or rear end of your Mercedes, depending on which end you are starting with. Make sure the jack is under the center of the frame so that you can jack up both tires on each side. Jack up the car enough so the tires are off the ground.
2. Slide the jack stands under each side next to the tires, under the frame. Lower the car enough so it sets on the stands. Remove the lug nuts of one wheel and pull the wheel off the axle. Locate the rotor, brake pads, and calipers.
3. Remove the bolts from the calipers with the wrench. Gently set down the calipers since they are connected to the brake lines. You do not want to damage those in the process. Put on the gloves and mask to avoid exposure to the brake pad dust.
4. Carefully remove the old brake pads. Apply the C-clamp to retract the brake piston. This will reset the brake system since new pads are being installed. Carefully put the new pads in place and remove the C-clamp. Bolt the calipers back in place on the new brake pads.
5. Slide the wheel back onto the axle and replace the lug nuts. Do the same process on the other side to replace the pads. Jack the car up and pull out the jack stands, then release the jack.
6. Jack the other end of your S500 up and repeat the same steps to replace the brake pads. Fully tighten the lug nuts with the lug nut wrench once all four tires are on the ground to secure them in place. They should not be able to be loosened by hand.

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The Hood on My 1982 Mercedes 380SL Won#039;t Release

1. Manually open your Mercedes hood. Wedge a screwdriver through the front grille and move the hood latch to the left to release the hood. Raise the hood.
2. Use pliers to remove the hood latch cable at the base of the hood latch at the front of your Mercedes.
3. Pull the loose cable from the front of the headlight and then trace it along the side of your hood compartment. There will be plastic clamps holding the cable in place. Pry these open with your pliers to remove the old cable from the clamps. Trace the cable back to the hood release lever.
4. Use your screwdriver to remove the ball-end of the hood release cable attached to the inside lever.
5. Use your screwdriver to attach the ball-end of the new hood release cable to the lever. Run the new cable along the side of your engine, placing it back into the plastic clips using your pliers.
6. Attach the other ball-end of the new hood cable to the hood latch at the front of your hood with a screwdriver. Close your Mercedes' hood and pull the hood release lever to test it.

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How to Replace an Oxygen Sensor in a Mercedes C320

1. Jack up the front of the C320 using a floor jack under the front jack point behind the radiator.
2. Place jack stands under the frame of the vehicle and lower the C320 onto the stands.
3. Climb under the vehicle and locate the oxygen sensors on the exhaust. They will look like small plugs screwed into the exhaust. There will be one before the catalytic converter and one after it.
4. Unplug the leads running to the oxygen sensors.
5. Unbolt the oxygen sensors using an O2 sensor socket and socket wrench.
6. Thread and tighten the replacement oxygen sensors and lower the C320 to the ground. Installation is the reverse of removal.

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