Possible Coolant Tank Failure

[Perfectlap]

water-cooled means water-cooled, if the system is not running 100% do not drive the car again. As Lawrence the cable guy says, git er done.
Make appointment with the independent of your choice and get the Benjamins ready.

when was the water pump last changed?

[ATX_Boxster]

^ agree - if you have a coolant issue, it's not worth it to drive the car...especially with the heat forecast for this week.

sounds to me like you need an accurate diagnosis of the problem.

i recently had my tank done by a small local indy shop here in town. the coolant system was also flushed and they installed a low temp thermostat. they are very enthusiastic about working on p-cars, and they are very reasonably priced.

if you need their contact info - just send me a PM.

[Spinnaker]

Have your system pressure tested to find the leak. Any shop or radiator place can do this. Identify the problem before you start replacing parts.
I just replaced the O-rings on the bleeder valve a couple of days ago. You have to remove the cover flap that surrounds the fill caps to see the bleeder valve and if there are is any leakage there.

[southernstar]

If there are no signs of leaks from the coolant tank and no water on the floor of the garage after driving, and yet water is being lost from the cooling system, have you checked your water pump? A failed pump can have greater leakage when the engine is operating than when parked. Also, you should check your engine oil to ensure water isn't getting into it through a blown head gasket. Admittedly, it does seem like a great deal of coolant to be lost through a head gasket, although I guess the second top up could be due to air locks in the system after loss over a significant period of time. Regardless, if you have been operating the vehicle with with air locks/bubbles in the cooling system, you run the risk of damaging the impellor in your water pump, adding to your misery. Even worse if you are running it with coolant in the oil. I agree with all of those who have suggested that you whatever it may be, you get it towed into a trusted mechanic immediately.

Brad