I have an overheating problem and I've found that my #1 fan that should be coming on at or about 195 degrees isn't coming on. I've checked the fan motor, it's good, I've checked the fuse and relay and they are good. The #2 fan comes on with the air conditioner just like it should. I did find that there isn't any power to the # 30 pin on the relay. Are the #1 and #2 fans controlled through the same temperature sensor? I've replaced the temperature sensor also. Any one have an idea what might be the problem?
Most GM cars will not turn the cooling fan on until 230 degrees or higher. One fan should come on when the ac compressor is running regardless of engine temp, Most of the time the fan relay has failed, failure can be just a tired relay or the fan is pulling too much current due to being worn out which burns out the relay.
Schematic is same for 4 cylinder or V6