The poor engine ground connection could cause corrosion of the radiator or other metal coolant components. This process is called electrolysis. Electrolysis usually takes place when an engine ground becomes loose or corroded. You can check for this condition by using a Digital Volt Meter. To do so, attach the black end of the meter lead to a good ground (negative side of the battery), and then connect the red lead so it make contact with the coolant in the radiator. Next, crank the motor over, making sure that the test lead does not touch any part of the radiator or the results will be invalid. Care must be taken when dealing with hot engine coolant. Follow all safety precautions and NEVER OPEN THE RADIATOR WHEN HOT!!! If the meter reads more that 0.3 (300 millvolts) you have a problem.
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