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Changing Your Coolant
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Changing your coolant is a pretty easy DIY. You will need to lift at least the front of the car to get the job done, but it is no means difficult, nor will it take a lot of time.
Set Of Low Profile Ramps (To lift the front end of the car enough to drain the block)
Flexible Head Ratchet (This will help to loosen the engine block drain bolt, you can also get in a 1/4" ratchet as well)
3 Feet Of Flexible Hose 1.5" Diameter Or Greater (This will be used to run the coolant away from the engine block and your face and into the bucket.)
Large Phillips Screwdriver
Metric Socket Set
Large Bucket (At least 2 gallons capacity)
BMW Coolant (BMW P# 82-14-1-467-704) $16
Engine Block Drain Plug Washer (BMW P# 07-11-9-963-200) $0.35
2 Gallons of Distilled Water (These can be found at any supermarket)
Safely lift the front of the car
1. Using a lift or a floor jack with ramps lift at least the front of the vehicle. Instructions for jacking up your car can be found here. This can be a very dangerous step, so make sure that the car is properly secured before ever getting under it. Never get under a car that is just supported by a jack!
Turn on the heater
Turn on the heater to 91 degrees at low fan speed
2. Turn the ignition on, but do not start the car. Set the heater to 91 degrees and the fan on it's lowest setting. (This will allow us to get all the coolant out of the heater core) If you are going to wait a few minutes before you refill the system, you can turn the car back off.
Locate the radiator fill cap
Locate radiator fill cap and loosen the bleeder screw
3. Make sure the car has cooled off! DO NOT OPEN THE FILLER CAP IF THE ENGINE IS HOT! (Hot coolant and steam will hurt when it touches your skin, and I don't think I have to say anything more) Locate the coolant fill cap and take it off.
4. Carefully loosen the bleeder screw with the large phillips head screwdriver. Since all of these parts are made of plastic they can easily be damaged.
Remove the splash shield
The splash shield
Remove the splash shield underneath the engine
5. Using a phillips screwdriver, loosen the screws and take off the engine cover. (Note: the screws won't come out, they will stay in place)
Drain screws for coolant reservoir and radiator
Locate and drain the coolant reservoir and radiator
6. Locate the two drain screws. They will be blue in color and should be almost directly under where the radiator filler cap is.
7. Place the bucket underneath the first drain plug (the one closest to the ground). Remove the screw carefully with a phillips screwdriver and let all of the coolant drain out. Once again, remember to be careful with the plastic screws so that they do not get damaged!
8. Place the bucket underneath the second drain plug. Open the screw carefully, but do not remove it, with a phillips screwdriver and let all of the coolant drain out.
Tighten the blue drain screws
13. Tighten down the blue drain screws by hand and then a little bit more with the screwdriver. Do not overtighten them since it is plastic and can break.
Mix the coolant with the distilled water
14. In your bucket, mix the entire gallon of BMW coolant with a gallon of distilled water. If you turned off your car, make sure it is back on 91F with a low fan speed.
Pour the new coolant into the coolant filler cap
15. Slowly poor the coolant into the coolant resevior through the filler neck using the funnel. Keep adding until you see coolant come out of the bleeder screw. (Note that the level indicator in the resevior will indicate that there is too much coolant in the system, but this is okay, it will go down after you drive it the first time.) Tighten down the bleeder screw (do not overtighten) and replace your coolant filler cap.
Turn on the car and check for leaks
16. Turn on the car and examine all of the places we worked for leaks. If there are no leaks, then take the car for a drive to bring the car up to temperature. Make sure you watch the temperature guage carefully. If the car starts to overheat, make sure you turn it off immedietly (safely of course) and rebleed the system.
After the engine cools down, check the coolant level
17. Make sure the engine is cooled down! Check the coolant level, and add so that the float's second notch is slightly below the filler neck.
Properly dispose of the old coolant
18. Be friendly to the environment and properly dispose of your coolant. Go to your local auto parts store or mechanic.
This is a simple do-it-yourself job and it should be completed at least every 2 years to ensure that your cooling system remains in good working order! This is an essential step in maintaining your vehicle and will keep it running for many more miles!