2000 Dodge Ram 2500 Q&A
2000 Dodge Ram 2500 Question: why does my engine surge when my a/c or defrost sw is set to a/c or defrost.
when sw is off everything is normal.switch the selector to a/c or to defrost and the engine will seem to back off and then surge about 40 to 50 rpm. thought it was my transmittion slipping at first but only does this when the sw. is turned to a/c or defrost. it does this every few seconds not contineously. just intermettently. thanks, hope i gave enough info. - tommytinker
ac compressor puts a load on the motor. Roy - mastertech6371