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This May not solve your problem; but may solve some else’s.
Being a person who has only put on a water pump on my 85 240 one time in my life I don't know much about cars but I am learning. I had a similar problem. At 85 degrees no problem, as soon as the outside temperature zoomed to the ninety with the AC on in stop and go…..trouble would come to the old Volvo The temperature gauge would move up two needle widths in three minutes. I would spend my time in traffic watching the temperature gauge more than the car in front of me. I did all the things you did to your car. Same problem. I put on an electric fan I found at a bone yard for $20.00. Same problem. I took the electric fan off; put the mechanical fan back on the car. The second problem in ninety degrees temperature was at speeds above 75 mph; the car would over heat by the two needle widths while moving at high speeds. By the way I live in the Washington D.C. area; the posted speed limit on the Capital Beltway is 55, the cars top 80 mph easily. I took it to a Volvo dealer; they could not find the problem.
My wife and I were on a road trip. She said the car sounds like wind was gushing in the front of the car or right under the engine. I look at her wondering if she really heard what I had been hearing for past six months on each road trip. I asked her how long she had been hearing this sound……she said about six months. Next question was why didn’t she tell me. I didn’t ask.
I came home one day and thought about what we were hearing. I went down to the garage, got under the car; and started looking for anything that may be loose near the front of the car. I found these three holes under the bumper. I don’t know what you call this thing but it is under the front bumper. It looks like it could be an air dam, which directs air to the condenser and radiator. The front of this thing had fallen down so no air I suppose was going to the radiator. I got one from a bone yard and installed it. The problem disappeared. Now at ninety degrees you may find me setting sitting on the Wilson Bridge in a 20-30 minute traffic jam, AC blowing…for a 240 it is not bad, and looking at the car in front of me trying to get to that fine state of Virginia. .
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