88 bird ATC Fault Code 01 November 03, 2008, 09:03:48 PM Ok I changed out the heater core in my 88 bird 5.0 with ATC the AC worked perfictly untill I changed the heater core. Now when I try to run the AC I get no cold air and Im not sure but I dont think that the compressor is cycling due to this code. Any ideas or tips would be great. Quote Selected