hi everyone could use a hand

i have a 2007 bmw 650i and my coolent level keeps dropping. i replace all hose and water tank. im getting a small leak of cooling dripping from passenger bottom side even when car is off it still leaks. does anyone know what this could be as i cant locate leak i also brang to firestone tire and they were not able to find were it was coming from thx

It could be the coolant temp sensor o ring.
Get Danco #31 from Home Depot.

i had someone call me and he help me find the leak its was hose off rediatior that connected to radiator and the temp sensor there looks like its leaking now i need find somewere that has these parts cheap or some kind of upgraded coolant hose

Listen to Taz, he gave you the answer. Typically this is a very inexpensive fix, here is a thread that shows the details about buying the new o-ring. Those that replaced the entire hose reported that they really only needed the o-ring which can be bought at home depot.

http://www.bimmerfest.com/forums/sho...ighlight=danco

thx my friend going to homdepot tommorow

how does that sensor come out i dont want to break it i have the parts but dont know if i pull it or twist it and i dont wanna break it

They have a clip that holds them on. Once you pull that off it typically will come off with minimal effort, slight pull and twist. I used a flathead screwdriver to slide in the piece that sticks out, then simply twist the screwdriver and it pulls the clip out to where you can grab it with some needle nose pliers.

I added a picture for you showing where the piece that sticks out is to remove the clip. This is for the big hose. If the Leak is in the sensor then there is a clip for that one that is different. Hope this helps.

yes it did. got sensor off replace ring and i put sensor back in but i didnt here it clip in and i can pull out pretty easy so i tapped it in with a hammer but still didt hear it click in feels like its tight but if i pull hard enough on it without squizing the sides i can pull it out. i dont not see a leak anymore but worried the sensor will pop off

There are specific grooves the clip slides in. If you miss those it does not slide into the locking mechanism and is just sitting there. Pressure could cause a leak if that is the issue and the sensor my come out. I would pull it out and see where the clip is and make sure it is in the grooves it should be in. Make sure you put the sensor back in THEN slide the clip on. Good luck.

it looks like it went into grove it feels pretty tight but i didnt pull super hard on it. the groove is that front of plastic that sticks out

There are essentially two parts there is the housing that the sensor sits in. Then there is the sensor. The housing has slots for the clip. The sensor has grooves that act as a catch for the clip and hold the sensor in place. You should not be able to pull the sensor out(without breaking it) if the clip is in correctly.

yes i just got it all done i pulled really hard did not come out and it does not leak yeah baby.my car does not leak oil at all that i can see but i see oil on bottom side of car like cake on oil is that normal
and thx for all your help