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Radiator fan kicks in on gh speed on an off even when cold…

Customer Question
Radiator fan kicks in on...
Radiator fan kicks in on high speed on an off even when cold and just started.
2007 Ford Explorer sport trac V8
Submitted: 2 years ago.Category: Ford
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Answered in 2 hours by:
1/23/2016
Ford Mechanic: Kenny Z., Ford Senior Master Tech replied 2 years ago
Kenny Z.
Kenny Z., Ford Senior Master Tech
Category: Ford
Satisfied Customers: 6,076
Experience: Auto Trans, Drivability and Electrical Specialist
Verified

Hello, my name is***** and thanks for your question.

To properly diagnose this a scanner is needed that can monitor PCM data in real time. It will need to be determined if the fan is actually being commanded high by the PCM or if the electronic fan clutch itself is sticking. If it determined that the PCM is commanding the fan clutch to high then certain inputs will need to be monitored such as cylinder head temperature and other inputs that could cause the PCM to see a failsafe condition which would also cause the PCM to command the fan to high. This data would need to be monitored with the symptom present.

If you are satisfied with your answer, please take a moment to rate my service as you see fit. Experts are not compensated without a positive rating. Providing a rating does not close the question, you can reply or ask additional questions without incurring further charges.

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Ford Mechanic: Kenny Z., Ford Senior Master Tech replied 2 years ago

Me

Hello, my name is***** and thanks for your question.

To properly diagnose this a scanner is needed that can monitor PCM data in real time. It will need to be determined if the fan is actually being commanded high by the PCM or if the electronic fan clutch itself is sticking. If it determined that the PCM is commanding the fan clutch to high then certain inputs will need to be monitored such as cylinder head temperature and other inputs that could cause the PCM to see a failsafe condition which would also cause the PCM to command the fan to high. This data would need to be monitored with the symptom present.

If you are satisfied with your answer, please take a moment to rate my service as you see fit. Experts are not compensated without a positive rating. Providing a rating does not close the question, you can reply or ask additional questions without incurring further charges.

23 Jan 2016, 8:21 AM

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Ford Mechanic: Kenny Z., Ford Senior Master Tech replied 2 years ago

Hello again,

If you need further assistance please feel free to reply and we can continue. Otherwise please take a moment to rate my answer as you see fit. After rating, the thread is still available should you need further assistance. Experts are not compensated without a positive rating. Providing a rating does not close the question, you can reply or ask additional questions without incurring further charges.

Thanks,

Kenny Z

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Ford Mechanic: Kenny Z., Ford Senior Master Tech replied 2 years ago

If you are satisfied with your answer, please take a moment to rate my service as you see fit. Experts are not compensated without a positive rating. Providing a rating does not close the question, you can reply or ask additional questions without incurring further charges.

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