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International Automotive Technicians Network
International 4300 mode door problem
Posted to HD/Fleet Forum on 8/28/2018 9 Replies

Hopefully someone has run across this problem before. I am well versed in the blend and mode door motors going out on these vehicles. I own eight 4300's and have seem most problems. The mode door gets stuck on defrost but it is not a door problem. I can take the blend door wiring pigtail plug it into the mode door and move the temperature knob to change air flow direction. I have tried two spare control heads, they work a couple times then stuck back on defrost. Unfortunately I do not have a service manual and my heavy duty scanner does not see this system. With a digital voltmeter I get a quick voltage reading and then back to zero when not turning the mode door knob. Any thoughts or diagnostic help appreciated.

Bob Hamilton
Owner/Technician
Springdale Automotive
Cincinnati, Ohio, USA

9 Replies Received (View Replies)

 

car Vehicle Data

2007 International 4300 7.6L

Engine7.6 L

car Vehicle Data

2007 International 4300 7.6L

Engine7.6 L