I had the same problem with my '75 164E recently. Before I had a new thermo installed it always stayed right in the middle of the green and afterwards it always shot up to the red. I installed a new radiator...no change. Finally the mechanic thought maybe it was an air flow issue and he installed an additional hi-performance fan that he uses on his hot rods (it mounts in front of the radiator and it is somewhat visible through the grill but barely) and it did the trick for my car. Now it stays in the middle of the green again. Of course, we have been having record hi temps here in Tucson...it reached 110 a few times last week and it gives the AC a real workout ':(
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1975 Volvo 164E - 86,000 original miles
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