Question about Oldsmobile Silhouette

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98 Oldsmobile Silhouette I could drive all day and the dang thermometer only moves one notch, Motor wont get warm and i don't want to mess up the van. I bought a thermometer but it's a bit of work if that's not the problem. What do you think.

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Keep in mind the temperature sender that indicates on the dash board is quite separate to the temperature sensor used by the cars power control module to set injection parameters etc. The dash board is to keep you happy the sensor keeps the engine happy. The thermometer sender is just a heat sensitive resistor (thermistor) and only as two wires to it. One wire is from the voltage supply and the other is to the dash board gauge (effectively a voltmeter) which monitor temperature by monitoring the voltage output due to the resistance of the thermistor in accord with the coolant temperature. First check that the connection with the sender is clean and free of corrosion. Put a voltmeter across the sender pins and turn the engine on. Measure the voltage change with temperature. If the voltage does change as the engine warms but the gauge on the dash is stubborn then it is likely that there is something wrong at the gauge. If there is not voltage change with engine warming then the sender is faulty.

Posted on Mar 27, 2011


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