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Too much grill block. Temp fine while using heater, spikes if idling or heater is turned off. I had the same recently. Generally takes 40-50 miles for it to spike up high enough to trigger the fan.
Fix the thermostat.
the Volvo is a mass air car. Mass air cars adjust the density of the hotter air automatically negating the WAI effect (sometimes worse).
On volvos, if that preheat valve fails, it will cook the MAF. I've seen this on my old 87 240, and 98 s70. It does work well at startup though, and below freezing, but isn't perfect.
On the 99 V70 I helped with (fathers) it liked cooler air, and actually a slight bit off ram (has to do with the throttle by wire and MAF).
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Shooting for 600 miles of range at 65-70 mph out of a vx.
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