I have a 1994 c4 my primary cooling fan won’t come on the fan and relay are both ok already checked those,when l crank the car the climate controls go in a default mode which turns on the a/c compressor and the secondary cooling fan and I can’t make any change with the controls,Any ideas will be greatly appropriated thanks

 

Welcome to the forum.
You may have to get a factory service manual to accurately diagnose this problem.