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Congratulations on the car choice! True story about the disgraceful way in which people keep their cars. And thereafter want top dollar for them...
The coolant temp sensor should throw a code into the control unit if it has a bad signal. You could just replace the thing if you think it's problematic. That is an easy repair to do.
Is the pulsation more like a vibration, or a periodic up and down idle type of thing? If the idle is hunting or rough then chase down the tune-up parts first. The throttle body, cap, rotor, wires, plugs, air intake hose (check for leaks) and air filter. Vibrations are more an engine mount thing although the harder (scantech) engine mounts are more prone to vibration. The Volvo ones are somewhere in the middle, while German ones are pretty soft. If the mounts are soft and allow the engine to shake at idle, you'll feel the tugging of the engine through the seat. Open the hood and sit in the car. See if the engine shakes at idle in gear. If so, a replacement of the mounts might be in order.
At any rate, the mounts are an easy/cheap fix. I usually do them on any new-to-me 240.
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1992 940 wagon, 72k
make people envious; smile often.
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