[bus_ter]

Hello,

Quick question for anyone with the Cayman.

The rear coolant lid. Should it screw tight or should it turn and 'click' into place in a horizontal position like the Oil side cap?

Thanks.

 

[wriggly]

Hello,

Quick question for anyone with the Cayman.

The rear coolant lid. Should it screw tight or should it turn and 'click' into place in a horizontal position like the Oil side cap?

Thanks.

I’ve posted about this in another thread. It’s supposed to click into place in the horizontal position. If it goes past to the vertical position, it’s been over tightened breaking or damaging the stop lug on the inside bottom of the cap. Porsche has revised the cap with a more substantial stop lug. The current revision part number ends with the letter “E”.

 

[wriggly]

Posts relating to the issue can be seen here.... https://www.718forum.com/forum/718-...vice-bulletin-coolant-reservoir-sensor-6.html

 

[bus_ter]

Oh crap. I have broken it!

I assume it's 'safe' to use just bring tightened down normally?

I can't believe how easily it broke :-(

 

[wriggly]

Oh crap. I have broken it!

I assume it's 'safe' to use just bring tightened down normally?

I can't believe how easily it broke :-(

Yes, it’s still safe. Just turn it a little past the horizontal position to make sure it’s tight enough. They are only around $40-$45 for the new revision cap. You might want to go ahead and order one from your dealer.

 

[bus_ter]

Thanks Wriggly. I appreciate your replies here!

I feel like an idiot. I just did a quick unscrew and tighten without thinking before I realised what I had done. It's so easy to break if you forget it not a normal tighten up lid.

I've read the other thread and googled online. It seems the original part (982 121 155 C) has been discontinued and replaced with (982 121 155 E). It seems the 'tube' is the same version. I've had a look underneath mine and it has the older (982 121 155 C) part printed.

One person on the other thread said it was the tube that was broken and not the lid. However nothing looks damaged on my tube.

 

[bus_ter]

OK I've backed off the tightness to where I think it should be. There's a danger here that if I overtighten it, and then put a new one on which doesn't go as tight I could lose the original 'tightness' seal.

 

[wriggly]

OK I've backed off the tightness to where I think it should be. There's a danger here that if I overtighten it, and then put a new one on which doesn't go as tight I could lose the original 'tightness' seal.

I think the design is intended to prevent overcompressing the gasket and driving the o ring too far into the tapered opening of the tube deforming the o ring.

 

[bus_ter]

I've ordered the part from Porsche UK.
Price is £25.25

There have been three versions of this cap. The original was (982 121 155 B) and the current version is (982 121 155 E).

They confirmed they are all interchangeable. Careful attention should be given to the plastic reservoir tube to check it has also not been damaged. It's a much bigger pain in the ass to replace if it has been damaged.

Hope this info helps someone in the future who Googles this problem.

 

[Viffermike]

Moved and Stickied to the 718 Boxster/Cayman Issues And Problems subforum, where I think this will do much more good. Great info, everyone! Checking my coolant cap tonight ...

 

[ritchieg]

Hello,

Quick question for anyone with the Cayman.

The rear coolant lid. Should it screw tight or should it turn and 'click' into place in a horizontal position like the Oil side cap?

Thanks.

I just got the 30,000 mile inspection on my 2017 Base Boxster. They told me the coolant cap was bad and replaced it. They also said it was a problem on a lot of 718's

 

[GregW]

Same as ritchieg--also on same model vehicle.

 

[DriveInHouston]

Neither I or the Porsche technician could get the filler cap unscrewed without adjustable pliers.

They tried a different cap from another 718. Same problem. My cap worked with the other 718.

The replaced the (filler) neck of the coolant reservoir in about an hour. Everything is fine now.

Unfortunately they were adamant in not replacing the coolant reservoir (which is the subject of a service bulletin) even though they could see in the car's computer that it gave the requisite warnings per the service bulletin (get out of the road, park the car, kill the engine, get Porsche to pick up the car--the only thing was that I was actually parked, the engine was stone cold, as I was trying to get the CarPlay working and I was briefly turning it on for testing). Haven't seen a warning in a year...