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My Monterey

Engine temp

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Just changed the serpentine belt & impeller on my 250 CR, Volvo 5.7, the motor always ran @ 160 degrees.  Now it warms up to 160 but as I accelerate to plane the temp slowly drops to 125 degrees, once I slow to idle it will rise back to 160.  Never overheats and runs smooth.  Any ideas?

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Likely the thermostat is stuck open.  Maybe it has something lodged in it, or maybe it is just worn.  I don't know the spec for your engine, but most are supposed to run at about 175F.  I recommend replacing your thermostat.

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