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I would suggest to do something like this and its a permanent fix. Hope it helps.
Drill hole slightly smaller than the threaded end of the barb. JB weld the fix. Force the tread into the plastic reservoir. Drill a hole on the threaded part to reach the lowest level of the coolant.
What type of plastic is it? Does JB Weld bond correctly? I just noticed mine starting to weep last week, going to need to either buy a new tank or do some type of repair like this.
Or, if you're okay running without the throttle body heater you can carefully cut off the nipple and plug the hole with a short sheet metal or all-purpose screw, wrapped with Teflon tape. The only thing that line does is return coolant from the throttle body heater.
You can buy a new OEM reservoir for as low as 20.00.
Agreed. Why try to repair a part that's so cheap and critical to the cooling system? Having owned many BMWs and Audis, the coolant reservoir is a part that you usually replace every 60k miles preventitively. They all get brittle from age and heat.