Guys heres my dilema its a 88 turbo 2 with a s5 swap with only 350 miles,
the car is eating coolant,theres no puddles on the floor,no sweet smelly smoke
i did the text for coolant on the spark plugs and theres nothing,pressure test and no leaks at all the guage holds the reading for hours and no pressure drop,i tryed to start the car with the rad cap off and look for bubbles nothing,hydrocarbon text and nothing replacad the o-ring at the LIM(the one rear housing)and nothing,if i start the car and i let the car idle my coolant level wont go down at all but if a drive the car for a couple off days my coolant disapear my buzzer goes crazy and my temp goes up and i need to add more coolant cause the sistem its almost empty but it wont take water from the overflow tank at all
WHAT THE HELL ITS HAPPENING i already overheat the motor twice in a week and im afraid of drving the car again.its there something that im missing?i replaced my termostat I installed new water pump flush the sistem new rad cap i dont know what to do next please somebody help me

 

check around for coolant stains near gaskets and hoses in the system. usually a leak should surface during the pressure tests, do the test when the engine is cold because a small leak near a hot area can evaporate as fast as it leaks.

 

i did the text with the engine cold and found a small leak around the water pump(on the bottom)i put a new gasket in and 2 days later the car overheated this time really bad the guage went up to the 3/4mark and i shutted off,i waited a couple off hours and redid all the coolant text procedures and nothing,the weird thing its that my upper rad house was all skinny looking like glued together and again my overflow was up to the mark and no bubbles or overflowing at all,by the way this time the car took 2 gallons of coolant to refill the sistem

 

full system capacity is barely 2 gallons so you had/have some serious problems... i dunno, that much water has to be going somewhere..

the sucked up hose means your radiator cap or overflow system is faulty.

 

so overflow system its down,i will get a new cap tomorrow then i will flush the sytem and one more thing did you think thats ist posible to have a big air pocket on the system that its causing this?sorry for all the question and thanks for the tips that you already gave me

 

an air pocket is possible but the buzzer would have let you know soon after starting it up. do you have an OEM thermostat installed in the car? if not then i would start there.

 

Water coolant seal inside the engine possibly?

Try without a heavy foot. Maybe clean the cooling system

 

*higher RPM's = more revolutions the water pump makes... More pressure... More leaking... I cant explain this well

 

If he had an internal water seal leak then he would have bubbles when he took the rad cap off.

 

coolant seal is bad , happend to me 3 times before , time to break open that motor buddy

 

I, too, have had it happen so I know the symptoms, and from what he has said in this thread he doesn't have them. No white sweet-smelling smoke and no bubbles in the filler neck.