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Coolant Leak - Bad

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My Boxster 987 (2006) Leaked coolant the first time last month, but stopped after that for a good 4 weeks before it happened again. This time all the coolant leaked out after an hour of drive. I thought it could be some hose or radiator leak, but after thourough check, none of these showed any signs of stress or leakage.

I inspected the area of leak and found that it leaked mainly at the rear wheel where the coolant expansion tank directly lies. I also found the area of the rear bonnet where the coolant cap and oil caps are, wet with vapour. I suspected it could be the expansion cap that was faulty. Is there any release/ relief valve on the cap that causes excess pressure to purge coolant out from the expansion cap?

If I have to buy a new expansion cap, is this cap the same for all year of manufacture? (97-08)

another question - there is a metal lever behind the plastic cover where the oil and coolant caps are, do I have to release this valve if I refill the coolant with water to remove air from the system, since the coolant all leaked out bone dry, I needed to remove excess air from the system.

thanks.

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My '06 just had the plastic coolant cap replaced under warranty, the dealer said it was cracked. It appeared to be leaking out the overflow at the Right rear tire.

Steve

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My '06 just had the plastic coolant cap replaced under warranty, the dealer said it was cracked. It appeared to be leaking out the overflow at the Right rear tire.

Steve

there are many types of coolant caps to choose from for the 987s. some has different parts numbers, colors etc. could you tell me which part number is your new replacement? thanks mate.

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My '06 just had the plastic coolant cap replaced under warranty, the dealer said it was cracked. It appeared to be leaking out the overflow at the Right rear tire.

Steve

there are many types of coolant caps to choose from for the 987s. some has different parts numbers, colors etc. could you tell me which part number is your new replacement? thanks mate.

No - there is only one approved coolant cap for your MY06 Boxster - 996.106.447.04 Cap -- US MSRP $22.09

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