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Recently had a camaro with the same issue.What I found was the fan itself causing the issue. It was creating so much resistance at the fan motor that the only time it would function is if it was forced to hi-speed by turning the air on. The different speeds hi-lo operate at different voltages. Would check this out and let me know me know if this helps.
Does it have an adjustable fan on it where you can set the temp that you want it to come on? The reason I ask is some people put them on there and if you buy it used later on this is a detail that often gets left out. check it for a control. If that not it it could be a thermostat sticking or a bad temp sending unit. Radiator may need to be cleaned and cored
Check your blower motor fan speed control switch. They go bad frequently. You could have checked the resistor by jumping the wires to the different terminals to be sure the resistor was good. That pretty much just leaves you will the fan speed control switch. Good luck.