About Condenser AC condensers are a critical component of your vehicle’s air conditioning system. The AC condenser transfers heat from the refrigerant to the atmosphere and thus is comparable to your engine’s radiator insofar as function. Examples of faults that are commonly seen in AC condensers include external damage to fins or tubes, pinhole leaks, and clogged passages. When these occur the condenser usually has to be replaced (save for minor damage to fins which can be straightened with a fin “comb”) so when should i replace my car condenser? 1.Leaking. .