Dave,
For a better view of how an air conditioner works, visit
http://www.howstuffworks.com/ac.htm The same principle apply to automotive A/C.
But basically, for the A/C to work properly, it must be able to dissipate heat from the condensor. This is done by blowing air through the condensor. If the car gets hot, the fans will blow hot air through the condensor which in turns generate more heat..... When the condensor heats-up too much, the pressure rises and the “overpressure switch” shuts-down the A/C.
Thus, if the cooling capability of the system is impaired by bugs and debris in the rad and condensor, the efficiency of the A/C will be affected.
Hope this helps.
Joe 90
