I think you will find it to be the other way around..
The aux fan does not come on until the high pressure calls for it. { High thermal heat load]. The fan then draws air across the condenser to help alleviate this high pressure problem before the compressor reaches cut-out safety pressure.
If a system has a leak , the fan will not come on b/c there is no longer enough refrigerant high side pressure to activate the aux fan cut-in pressure spec..
So, a leak will cause the fan to not operate , not the non operating fan causing the leak....