Maybe A compressor problem
When driving stop and go usually in town traffic, Arizona at around 100 degrees, our 2006 town car wants to heat up. When this occurs I shut down the air conditioner right away and almost immediately the water temp goes back down. Could this be a an A/C compressor problem?
Doubtful, it could be a A/C cooling fan problem or an air flow problem through the radiator, check for debris in the radiator cooling fins if there is a lot back wash the radiator with water, if clear then have the cooling fan and electronics checked.
Good call tennisshoes. Question: is the engine overheating or is the needle just going up? The conditions you describe are quite a heat-load on any engine. If it's running a little warmer than it used to - that's to be expected but if it's over-heating, get it looked at. Use the Gold Ford recommended Antifreeze - no Green or Orange - 50/50 or up to 70/30 mixture - while I'm thinking of it: Check the Pressure cap and water pump output too. Serpentine belts these days tend to stretch instead of losing chunks out of them - check your belt tensioner to see if it's near it's limit. Fan failures are common and about $260 + labor.
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