Still a little confused.
Actually engines are just as hot on 15 minutes of driving at 25 mph, as they get from going 60 all day long.
They are supposed to get hot right away, and then never get any hotter.
So it is not the speed at which your engine gets hot that matters, but that it is getting too hot, and the AC not working would support it really is getting too hot.
Therefore, the single most important thing is if there is enough coolant. If there is a leak. And you have not told us yet.
If the coolant is low, it won't reach the temperature sensor, so the fan will not go on. You must check the coolant level before you blow the engine!
Check to see if there two fans behind the radiator. If only one is operating when the a/c is on the engine will run hot. A sensor wire may have been disconnected and the second fan is not receiveing the signal to run.
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Unlikely, because they don't do anything but attach a tach and rev the engine. I would more immediately suspect you simply are coincidentally low on coolant. I doubt if the fan is belt driven. You need to check if water pump belt tight enough, if fan goes on and off, coolant level good, if there is a leak, if water pump is binding or leaking though weep hole, etc.
I'll try to clarify. The fan does not go on and off. The car sounds like it has just been driven a long distance on a hot day (like an out-of-town trip) yet only having been driven a short distance (a 15-20 minute drive). The air conditioning unit blows. Initially the air is cool (for about a minute) then it blows warm air. Meantime, the gauge that indicates the temp of the engine (?) goes from C (prior to ignition) to 1/4 of the way between C and H at idle to H within 10-15 minutes of driving. No warning lights of any kind light up on the console. Not yet due for an oil change; recently had alternator and new battery installed. Does this information help?
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