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The best tip I can give against hot running, without mods =
change your coolant to 70% water/ 30 % glycol.
Now my temp meter is 8 hours 50 in stead of 9 o clock in hot summer temps.
The thermal capacities of pure (100%) are superior to any mixture of glycol / water.
Glycol is added as antifreeze and temperature riser of the cooling system.
The glycol reduces the thermal capacities of pure water.
BUt VOLVO rads are designed for this mixture (as all cars).
I drive a 30 % glycol and 70 % water: this keeps the engine always EASILY at temperature (moderete climate).
This certainly helps cars with AC, because a 30/70 mixture can draw off more heat than a 50/50 mixture.
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When I did my head gasket, I removed also the rad and flushed inside countercurrent.
A lot of small deposits were coming out.
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240 '88 B200K wite sedan 255K km Europe virgo+all turbo gauges, Phoenix Gold + Kenwood ampli, Focal door speakers + tweeters, Kenwood 6'x 9', 10 CD changer in enlarged globe cabinet, dubble rear coil springs , hitch, fog lights, 2 extra rectangular pencil
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