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Fluctating engine temperature at constant speed S40-V40 2002

posted by  dekam on  Thu Nov 25 10:40 CST 2004
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Hi,

I've just bought a 2002 V40, my very first Volvo!

Since the trip to my work and back allows me to drive at constant speed for quit some time it's probably needless to say I'm a fond user of the cruise control.

However, when travelling on cruise control I notice that the engine temperature is fluctating. Initially the engine gets up to normal working temperature but then the gauge starts to fluctuate. Usually the guage moves somewhere between the normal operating temperature and about half of that, but sometimes the needle drops way down only to recover quickly. Since I assume that the acual engine temperature does not fluctuate that easily I'm suspecting a broken temperature sensor or thermostat.

Suggestions anyone?

Thanks!





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