Medium and Heavy Trucks
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My mistake. On an SDP engine. It uses Pin 21.
Here is the image.
Let me know if you need more help.
Thanks for the information.
That sounds like the AC switch may be keeping the fan on. It could be a normally open or normally closed AC pressure switch. I would try disconnecting it and also jumping it with a paper clip or wire and see if the status changes. You could have a bad AC switch or damaged wiring going to it.
Thanks for the information. When you jumped it, did the status of the AC switch change on the ET status screen? IF it did not, you could have a broken wire to the AC switch.
One more thing. On these engines, its possible for the Transmission to turn on the fan. I've never run into this but its in the trouble shooting guide.
Ok. Not sure on the trans turning it on I would assume if it had a cooler and was running hot.
Here is the complete test for troubleshooting the cooling fan. I hope this helps.
Let me know if you need more help. I hope you can find the problem.