Looking at a CAT 336DL with a heat/AC package. The heater fan is inop, control panel indicates but fan never comes on. I do not have access to SIS to understand the logic or electrical schematics. Can anyone offer information on how the system works so I can troubleshoot effectively without shotgunning parts at it? Maybe some schematics??
Serial Number gets you a schematic. Too many options (about 50 truth be told) of 336D model to try guessing. Same S/N will throw up the System Operation for the aircon/heating system.
Put test lamp across (+) & (-) terminals of blower connector.
Nige, thank you for your help. The SN for the 336D is W3K00705
Just sent. Check your PMs & confirm receipt please.