Question about 1998 Saturn SL
You have done everything right so far. Sometimes water leaks out when the engine is hot and evaporates almost instantaneously, a classic point is the seal on the water pump pulley shaft. To find such a leak you need to pressure test your coolant system. The normal operational pressure of a coolant system is 7lbs/sqinch at running temperature. The pressure test will put in 11lbs/sqinch and then monitor this over some time looking for a bleed down due to the leak. If a leak exists to the exterior of the engine you should be able to spot the seepage. The next test will be to run the engine up to normal temperatures and to monitor the pressure, if the pressure jumps to 15lbs/sqinch when still cold then this indicates an internal gasket leak as exhaust gases are pushing out of the cylinder in to the coolant. One check to make is to remove the plugs one at a time and inspect them. Sometimes if water leaks into cylinder it has the effect of 'washing' the specific spark plug clean.
Posted on Sep 16, 2010
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Posted on Jan 02, 2017
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