Re: Coolant voltage test?? - Saab 9-3SS Bulletin Board - Saabnet.com
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Re: Coolant voltage test??
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Posted by Mark (more from Mark) on Wed, 27 Oct 2004 16:10:45 Share Post by Email
In Reply to: Re: Coolant voltage test??, Dean, Wed, 27 Oct 2004 13:45:24
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Basically as follows:


We all know that neglected coolant can lead to a clogged cooling system and a loss of cooling system efficiency, but it can also cause other less obvious problems. The buildup of coolant scale and deposits can coat or corrode the exposed surfaces of engine temperature sensors, affecting their accuracy. Inaccurate sensors may send incorrect information to the computer, and temperature controlled vacuum or electrical switches may fail to function properly. Any of these may cause driveabiltiy problems. If the coolantÕs age or condition canÕt be easily determined, there is a quick check for coolant contamination using a Digital Volt-Ohm Meter (DVOM). Attach the positive DVOM lead to the radiator, then dip the negative lead into the coolant at the filler neck. A voltage reading of 0.2 volts or less is very good. A reading of 0.5 volts should be considered borderline and anything over 0.7 volts is unacceptable. If the coolant fails this test, the cooling system should be thoroughly flushed and cleaned. Remove any engine temperature sensors and inspect them for contamination or other damage. Repair as necessary.

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