Hi fellow members!
I finally found some time to replace my leaking coolant tank. As some of you might remember it all started with the "low coolant" light being constantly on. Replacing windshield washer sensor and coolant level sensor didn't solve the problem so I figured out that rubber o-rings on the float itself in the coolant tank deteriorated and caused the magnet to fall on the bottom on the tank. This caused the low coolant light to stay on all the time
. In addition, it started leaking and I managed to fix it temporarily with some quick putty I bought from local auto parts store. But then my tank started leaking right on top where the connection to the cap is located. Long story short age did its job and all seals deteriorated.
The part number for the coolant tank is A 170 500 06 49
So here's how to replace it. Took me about 30 minutes and was super easy.
1) 6mm, 7mm, 8mm wrench sockets
2) Flat head screw driver
3) Rubber hose (to drain the coolant)
4) Empty 1 gallon plastic jar
6) Rags to catch any spills
NOTE: your car MUST be COLD! Do NOT perform this procedure if you've driven the car recently!
First of all you need to get your car on ramps and remove the plastic shield on the bottom of the car. It's held by 4 screws. If you ever changed the oil then you already know
Next, open the cap on top of the coolant tank to allow coolant drain freely when you will unscrew the red cap on the bottom. If you don't open it - it won't drain since there will be a vacuum created.
Then, take a piece of a rubber hose that will fit onto the draining tip. Connect it, put the other end into the empty plastic container and start unscrewing red cap till the coolant starts to flow. You don't need to drain all of it. One gallon is enough to take the coolant tank off.
Next, remove the top plastic shield to access the small hose clamp. Disconnect it.
Wiggle the coolant tank out of place to get access to the coolant level sensor. Carefully remove it. NOTE
: if you're looking from the top then the sensor is removed by turning it clock-wise.
Now note the supporting C-clamp for the main hose on the bottom of the radiator. Carefully pull the hose towards the engine and it will snap off. This will give you some slack.
Disconnect the clamp on this hose from the coolant tank. Use rag to catch any leftovers in the tank and not to spill it on your car. Also NOTE: DO NOT
drop the hose since we didn't drain all the coolant and due to level differences it will spill from the hose. Instead, carefully secure the hose to be on top. Here's how I did it:
Take two hoses attached to your old tank and transfer it onto the new one.
The assembly is in reverse
. Reconnect all the hoses, sensor, make sure you tighten all the clamps. Top up back with the drained coolant. Press on the big top hose a few times to eliminate any air bubbles from the system. Close the coolant tank cap. Double check everything. Start the car and check for any leaks.
Congratulations! You deserved a beer
Another NOTE: check your coolant cap. The rubber seal on mine was deteriorated as well and I had to get a new one. New Expansion tank cap A 124 500 04 06.
Was only $6