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Cooling Fans

jsamayoa
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jsamayoa Member

jsamayoa

Posted
Posted

Left fan on Carrera S 2005 comes on but right side does not. Water temp is normal. Oil temp is slighlty elevated (close to 250 F). Is this normal or is fan bad? Thanks.

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RFM Member

RFM

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997 are managed by a control box (front), these would cause sometimes problems. Check the connectors visual and use a diagnostic / test tool to check the control box.

jsamayoa Member

jsamayoa

Posted
  • Author
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Are both fans meant to work simultaneously? Does one come on with A/C and other thermostatically sensing water temperature? What's logic? I spotted issue becasue oil temp was slightly hotter, maybe 25 degrees (up to 250 on gage). Thanks.

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JFP in PA Member

JFP in PA

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The fans are controlled by an algorithm in the DME and work in unison. The fans have two speeds, one for just cooling, and another faster speed for cooling/air conditioning. Regardless of which speed they are running at, both fans should be turning at the same speed. The DME triggers them for cooling by monitoring the coolant temps, the AC speed is triggered by the AC system engaging the compressor.

jsamayoa Member

jsamayoa

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Follow up to problem. I took the inner fender liner to inspect the fan. It was jammed and would not turn. I forced slightly to rotate and a small rock came off. It was jamed between the blade "skirt" and the housing. This gap can be 1/8" and as small as 1/16". Once the rock came off, the fan started working perfectly. Words to the wise, inspect cooling fans on regular basis for small rocks that are slinged from the tires and can keep fan from rotating. Problem solved.

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Loren Member

Loren

Posted
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Posted

Follow up to problem. I took the inner fender liner to inspect the fan. It was jammed and would not turn. I forced slightly to rotate and a small rock came off. It was jamed between the blade "skirt" and the housing. This gap can be 1/8" and as small as 1/16". Once the rock came off, the fan started working perfectly. Words to the wise, inspect cooling fans on regular basis for small rocks that are slinged from the tires and can keep fan from rotating. Problem solved.

A great example of looking for the simple solutions first! :clapping:

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