randy kleis: You must replace the thermostat at the bottom of the expansion tank on automatics, part #17111437362.
Henry Lavigne: Hey Ed, can you explain the proper way to place the metal spring that sits above the trans thermostat in the expansion tank? I think the big end is on top, but does it seems to sit to one side in there due to some plastic nubs. Any insights?
7Monte9: Very helpful video. I didn't even take off the front air intake. Just the air filter box. Its a good idea to change all o-rings while you have everything apart. Thanks for the video!
TheRudenreckless: Info: when pooling the tank up after disconnecting the switches at the bottom, twist the tank side to side to loosen it up!!!
A good video man thanks for the info but I broke a couple of plastics cuz I couldn't see any shots of the bottom of the tank and what needed to be disconnected. Other than that a helpful video.
techno247: i have no leaks but my light comes on randomly could it be the level sensor
Ravichandran Manogaran: Hey thanks for the quick reply ! Will go for it this week
EdzGarage: No, you don't have to drain all coolant from the block, but most of the coolant will be drained doing this job. As long as you're there, you may want to change the transmission thermostat too located under the expansion tank if the car is an automatic.
Ravichandran Manogaran: Thanks for the DIY ! I am going to give a shot this weekend but I have a question ..Do you drain the coolant completely before you proceed with removing the expansion tank ? I mean I know you drain the coolant in the expansion tank and the radiator but do you have to drain the coolant from the engine block too like when a coolant flush is performed?
EdzGarage: No coment? What does coment mean?
Thanks for watching!
gagah tanjung: no coment
EdzGarage: Check eBay.
Gerardgrx: My car is leaking from the upper hose that goes from the expansion tank to the radiator, is it possible to just buy the hose by itself? I've been looking at parts online but they only sell the full kit, tank, sensor, upper and lower hoses
michellesalazarms: Will car not start if reservoir is broken and shooting coolant out?
Rise Mir: hi ed next time you need cooling tester
mike moe: in a reall cruch situation what is the harm in running with the AYY hollowed out on spring or valves
what is the possible bamage to the auto trans if the ATT is holloed out and ran no spring or valves and why is there a ATT anyway ?? thanks
mike moe: one addition to this when pulling the tank have a new ATT valve ready it will probably break into pieces when pulling tank
Macedonio Gomez: Awesome tutorial!! thanks sharing it!! I have a leak too and tomorrow I will check this coolant tank. I let you know how a did it!
EdzGarage: You have to bleed the system. I showed how at the end of the video.
Josh G: Hi there wondering if anyone could help me out with an over heating problem on my e46. Overheats after about 15 minutes and the heat inside dosent work. replaced the therometer didnt do anything please help!
mojahangir: Hsve you filled the water right up bruv with the engine turned off??
Manny Zuni: Brother . I have problem i chage .spancion tank trasmission termostat.new radiator. water pump. Termostat water pump. All cooling sistem .i blead it. Fans working good.bu the car still over heating. Please i need u help...thanks..
rweiljr: Thanks for the good advice! I wasn't pushing down hard enough to seat it properly, trying not to break all that plastic.
EdzGarage: @3:56 I show the latch you have to pull out to remove the tank. Make sure this latch is pulled out when you install the tank. Push the tank down hard and push the lock in. If it latches and you can't pull it back out it shouldn't leak.
rweiljr: This is a great, informative, video, thanks! I had to replace the lower thermostat as well. Wonder if you can help me with something - the expansion tank doesn't seem to "seat", or click into place, or anything, and when I poured in some antifreeze, it all leaked right out. I don't want to break anything by forcing it too hard...is there a secret to seating it back on?
EdzGarage: There is a coolant level mechanism in the tank. That may be what you are hearing and seeing.
bikermaniac: Hi Ed,
I had my expansion tank cracked so I bought a new one on ebay. I just receive it but it has some ticking and clicking sound inside. I grabbed the lever indicator stick with my left hand (to avoid it to move) and with my right hand I tilted the tank and that noise appeared. I checked with a lantern and it looks like two small metal pieces are loose inside. Would that be part of the tank? or the tank is just broken or faulty? Thanks for your help.
Wididy: just the coolant hose was loose, i had to get a new one.
moeramz: I have the same symptom smoke was coming out of the radiator cap and coolant was flowing everywhere, was the radiator cap the issue or the whole expansion tank?
EdzGarage: Only as much as needed, but it may drain out anyway so be ready for that.
Tiffany Tran: I am replacing the expansion tank ,do I need to drain the coolant out from the radiator or not
Tiffany Tran: Just a quick question , s
EdzGarage: Thanks for the comment and for watching!
tube101ish: great video.. thank you so much for your help
EdzGarage: I used the green stuff mixed with distilled water.
Joe Cable: What kind of coolant to use in a 2003 325i e46? Do you have to use blue bmw?
EdzGarage: The problem with your fix is that the cooling system pressurizes (12-14psi), so tape probably wont hold.
08nickyJO: Thanks for sharing! I know this sounds crazy but my Radiator Expansion Tank cracked on the side and I have no funds to replace it at the moment. Is it safe to use a specific tape to stop it from leaking? For now...
EdzGarage: Parts aren't too expensive, but labor might be high. Maybe $500 total.
gvvvv2300: my card is in garage. they told me there is a crack in the tank and it needs to be replacement. along with this, they are saying there are other parts which tend to break on e46. how much do you think is it reasonable to get this job done? thanks a lot in advance.
Wididy: for the last year i've had many coolant problems. yesterday my light went on so i added coolant to top it off. i hadn't driven my 323i until today and about a mile into driving, my light went back on! when i got home i popped the hood and steam was coming from the coolant cap, and there was evidence of coolant everywhere (like it exploded or something) i have not opened the cap yet because it's probably still hot... do you think its a leak? ........
EdzGarage: I would add some coolant. You never know if your level sensor is bad.
My dipstick thingy is at the bottom, and yet the coolant light hasn't come up on the dashboard yet!? Is it still safe to drive the car?
Chris: @edzgarage Thanks for the advice!
EdzGarage: You can replace the upper rad hose without draining the coolant. You will loose some fluid so you will need to add some after the replacement, and you may not need to bleed the system. You should bleed anyway to be sure.
Chris: Thanks for the vid!
Still got one little question, I ordered a new upper radiator hose as the bleeder screw broke.
The dealer told me they will get it on there for about 65 dollars
That's to much! told them I will do it myself, I asked them if I need to drain my coolant, they said no, even though the tank is full.
Can you confirm this?
after that I should bleed it, unscrew the bleeder screw a bit and put the heaters on full if i'm right? this time I go easy on this stupid screw :-)
EdzGarage: Thanks for the comment and for watching I appreciate it!
ThSniperFail: Just want to give you a massive thank you for up loading this video mate! You saved me a lot of stress and garage bills!!! Can't thank you enough. Keep up loading maintenance videos your saving us all!!!
EdzGarage: I reused my coolant sensor and the light is off. Maybe yours is defective or it got damaged.
rssteve16: did you have a problem with the coolent warning light??
Expansion Tank Replacement and Coolant System Bleeding e46 BMW 325i4.7
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