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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 4730
Experience:  Owner at DJ Wilson
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I have a 2007 Volvo vnl 670, with d12. My fan clutch will

Customer Question

I have a 2007 Volvo vnl 670, with d12.
My fan clutch will not disengage. I have changed the fan clutch and the fan clutch solenoid.
Fan clutch is staying on. I'm getting 8.8 volts out of the connection to the solenoid but no air is coming out of the air line to clutch. Any suggestions?
Submitted: 5 months ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 5 months ago.

Hi Ed. My name is***** will be glad to help. Try using shop air separately to the fan hub to see if there are any leaks in the fan hub and see if you can engage and disengage the fan hub manually with shop air to confirm the hub is okay. If okay verify ground of the solenoid as it is the ECM that grounds the solenoid to engage the fan. Inspec the wiring and temp sensors/switches. Let me know

Customer: replied 5 months ago.
How would I check the ground for the solenoid if it is through the ecm
Expert:  Daniel Wilson replied 5 months ago.

First for test purposes disconnect the existing ground and run a test ground to see if you can get the fan to engage. If so you will then inspect the wire to the ECM for damage. If thats okay there is a reason why the ECM is not connecting ground to command the fan on. Could be a fault sensor or loss of input signal from a sensor that tells the ECM to turn the fan on. The diagnostic software will allow you to monitor live data and switch status in live data.

Expert:  Daniel Wilson replied 5 months ago.

Sorry I mean disengage

Customer: replied 5 months ago.
The fan is engaged all the time. It will not disengage.
Expert:  Daniel Wilson replied 5 months ago.

Thats what I just said in my correction I said engage and saw the typos

Expert:  Daniel Wilson replied 5 months ago.

Spring engaged and air released

Expert:  Daniel Wilson replied 5 months ago.

The ECM commands the ground to engage and disengage the solenoid

Expert:  Daniel Wilson replied 4 months ago.

Hi, Did you get this resolved? If so please take a moment to rate my service as that is how the site credits for my time helping on the site.

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