Coolant temperature
Discussion
Normally bang on around 90degrees and should not move once warmed up - fluctuation usual indicates one of (or both of) the following - thermostat is iffy or the expansion tank cap is faulty. I'd start with the thermostat and replace that first - I'd always opt for a genuine volvo one - cheapo ones are a waste of time.
The expansion caps have a tendancy to crack and start to loose the seal in the system which creates hot spots which can be very damaging to the engine.
The expansion caps have a tendancy to crack and start to loose the seal in the system which creates hot spots which can be very damaging to the engine.
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