My car is overheating. It only overheats in stop and go traffic, and will cool down when driving at highway speeds. Here is a list of things that I have tried: 1. Changed three relays in the engine bay, labeled Fan No. 1, 2, and 3. 2. Removed the relay for Fan No. 1, and used wire to jump it. 3. Tested both fans, plugging them directly into the battery, they both work. 4. Shorted the thermostat at the bottom of the radiator. 5. Tested the resistance of the thermostat on the engine block. 6. Drained/refilled the coolant in the radiator. There are 2 fans on the radiator. I've read that one of them should turn on when the A/C turns on. This does not happen. The A/C is also making a grinding noise when it kicks on, but the air is still coming out cold. What else could I try?
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