Question about 1999 Porsche Boxster

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63k 1999 boxster have had antifreeze evaporating? Living in Desert. Oil is clean, no leak in head gasket. No spills on garage floor. Fill over flow 6 to 8 oz about every 1500 miles? I'm still learning about the auto. Is this possible with smaller radiators? I had it checked at dealer with other maintence requirements. All in all, car runs great!

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  • braynmorganp Jun 28, 2009

    It's one explanation, over flow container seams small compared to

    other auto's owned. US products mostly/ curious if expansion will

    worsen with AC use in hot 100 plus? Porsche has sensor float in

    over flow to assit in protection of low antifreese/ idiot light on temp gauge in cockpit. Bottom Line / saving motor issues / repairs, etc. Thanks

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  • Master
  • 534 Answers

Check that you are not overfilling the cooling system.
Header tanks need to have some space for coolant expansion.
The system coolant level may stabilise at the lower level.

Posted on Jun 28, 2009

  • John Bloomfield Jun 29, 2009

    Expansion is directly related to engine coolant running temperature. With A/C running on a hot day the motor coolant will run at a slightly higher temperature as it:-

    1) is providing the additional power for the A/C compressor / fan motors,

    2) The engine coolant radiator runs a little hotter, as its cooling efficiency is reduced by the additional heat dissipated from A/C condensor, which is usually in the engine coolant radiator air flow.

  • John Bloomfield Jun 29, 2009

    P.S. If the loss of collant persists, a new coolant system pressure cap is the next logical step.

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1 Answer

How do I check for a blown head gasket on my 1990


Pretty much same answer as I gave for 87 Reliant see below. Shops have equipment to do cylinder leakage test. Do basic stuff below before doing last test ...cylinder leakage...which costs $$$.

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Clean the filter and pan with a spray cleaner, run engine for a few miutes.
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Probably is rear main seal leaking, very common trouble.
If not leaking much, keep drip pan under car to keep floor clean and drive on.
Most cars do leak after they age a little. The black line in the middle of the road is oil leaking from cars. Very common.

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Antifreeze/coolantleak


Check the oil for traces of coolant (oil will be milky in color) and oil cap too. If oil has coolant in it head gaskete needs to be replaced. Also check the floor inside the cabine (espetially passenger side)
If it is dump there is leak from heater core. Also open engine block
Coolant might spray onto hot engine and evaporate.
Please kindly let me know if the information was usefull for you or you need more info
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