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      07-18-2012, 09:11 PM   #1
ThunderMoose
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Radiator Cap Doesn't Click

Just had my car in for service. Drove it for a couple of weeks and got a low coolant alert. Radiator cap was very loose and there was obvious spillage. I noticed when I tightened it, it won't "click". The arrows line up, but the cap is free to turn back open. I looked at cap and expansion tank and all the little plastic bits appear to be in good shape.

Realoem shows the cap to be the same as for my wife's X5 so I swapped to test. M3 cap clicks on the X5 expansion tank. Neither X5 nor M3 cap clicks or feels snug on the M3 expansion tank.

Any ideas what may be wrong?
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      07-18-2012, 09:19 PM   #2
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Hm. Not sure of your situation. Here's mine, I checked my coolant this past weekend.

The tank cap has a definite 'stop' to it. That is, the cap screws down to a certain point, then stops. This corresponds to the cap being very snug with the tank neck.

If definetely feels very secure when shut. I would describe the torque to start to remove the cap as a half grunt. Can do it with bare hands but have to mean it.

Hope this helps...
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      07-18-2012, 09:40 PM   #3
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Quote:
Originally Posted by Llando88 View Post
Hm. Not sure of your situation. Here's mine, I checked my coolant this past weekend.

The tank cap has a definite 'stop' to it. That is, the cap screws down to a certain point, then stops. This corresponds to the cap being very snug with the tank neck.

If definetely feels very secure when shut. I would describe the torque to start to remove the cap as a half grunt. Can do it with bare hands but have to mean it.

Hope this helps...
I have a zero grunt cap right now
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      07-18-2012, 09:58 PM   #4
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Quote:
Originally Posted by Llando88 View Post
Hm. Not sure of your situation. Here's mine, I checked my coolant this past weekend.

The tank cap has a definite 'stop' to it. That is, the cap screws down to a certain point, then stops. This corresponds to the cap being very snug with the tank neck.

If definetely feels very secure when shut. I would describe the torque to start to remove the cap as a half grunt. Can do it with bare hands but have to mean it.

Hope this helps...
LOL at a half grunt
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      12-05-2016, 02:46 AM   #5
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Reviving this thread from the graveyard because I just discovered that I have the same issue. Did you ever find the source of the problem? Did replacing the cap fix the issue? Thanks ThunderMoose!
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      12-05-2016, 08:44 AM   #6
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Is there a rubber gasket in there you can change? Drill tge edge of the cap, add a zip tie to something to hold it locked? Buy new tank?
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      12-05-2016, 08:44 AM   #7
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If the cap works on your wife's X5, then it's probably the tank itself

Expansion tank: https://www.ecstuning.com/b-genuine-...k/17112283500/

I also notice our cap has been superseded by a new one with yellow markings.

New cap: https://www.ecstuning.com/b-genuine-...p/17117639021/

I just messed with my cap, I unscrewed it completely (after two very easy turns, the resistance got greater), then tightened it back down until the arrows meet, a very light click was felt. It was very easy to unscrew it loose, like the cap was never tighten, but mine has no leak..so I think that's just how the pressurization work with the cap.

Last edited by Leonardo629; 12-05-2016 at 10:01 AM.
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