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      07-18-2012, 08:11 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, 08:19 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, 08:40 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, 08:58 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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