Try checking NTC sensor - Saab 900 Bulletin Board - Saabnet.com
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Try checking NTC sensor
Posted by Micah in NC (more from Micah in NC) on Fri, 2 Sep 2005 07:56:15
In Reply to: floods under 60 degreesF-desperate, Mike S 88Turbo, Fri, 2 Sep 2005 04:56:34
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Mike,
Hi. You might want to check your NTC (Negative Temperature Coefficent) sensor, aka Coolant Temperature Sensor (CTS), which lives on the engine head down below intake manifold pipes for cylinders # 2&3. It has a plug with two wires in a harness going to it. Plug is black, but sensor body has blue plastic top.
From the TSN 900 FAQ page:
"One of the least known sensors is the engine temperature sensor (aka NTC II). It is a semiconductor resistor, also know as a thermistor, and the NTC stands for Negative Temperature Coefficient. This means that the sensor's resistance goes down as the temperature goes up. If the ECU applies a fixed voltage to the NTC resistor, it will receive a smaller signal back as input from a cold resistor with higher resistance than from a warm one. This sensor is screwed into the water passage on the intake side of the head between intake runner #2 and #3 on the 900s and just under runner # 2 on the 9000s. Test the sensor by probing the two contact points with a multimeter to measure the resistance which should be:
Cold Engine -5,800 ohms at 32F (0C) to 2,600 ohms at 68F (20C)
Warm Engine - 320 ohms at 176F (80C) to 180 ohms at 212F (100C)."
Hope this helps!
--Micah in NC
'84 900S, 297K mi.
'87 SPG, 138K mi.
posted by 67.35.19...
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