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from what I can tell from reading your 3 threads on this subject, you are experiencing a gage that says you are running hot, without any of the symptoms. The symptoms are loss of coolant level, and accelaretaded consumption of oil, very hot engine. I have always found the B18 to be well cooled by it's radiator set up, except at idle where often the water pump does not move enough volume. If you are reading hot after 20 min on the highway I doubt you are overheating, more likely YOU'RE GAGE IS INNACURATE! All three of the 120 I have owned had a gage that reads far to the right at cruising speed, winter or summer, the needle actually disappears to the right if I drive hard for an hour and then get stuck at idle on a hot day (the cure for that is to rev the engine a little, this dispalces more coolant and allows the radiator to do it's work. So maybe relax a bit, see if the engine is actually overheating, and of course do all the other things sugggested in the thread like checking the quality of the hoses etc... BY the way all my volvos are very stable re overheating, my most modern vehicle is a 92 VW eurovan it it is much more prone to overheating on a hot day than my 68 volvo.
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Patrick, '68 220, '83 245, '92 Eurovan (work truck).
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