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Failure of Engine Compartment Blower

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After driving 20-30 minutes in warm (100-110F) weather, I have a “failure of compartment blower” error with a flashing light in the top end of the water thermometer. There is no additional specific error code. Oil temp is 200-210, water is 175F.

When I stop and turn the engine off the blower is running and keeps running for another 20-30 minutes.


This is a 2007 997.1 C4S, bone stock, 72,000 miles, runs well, water pump and thermostat replaced preventively at 60K by dealer.


Any advice on how to handle this? Is this a sensor problem? Thank you all.



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I'm unable to link, but the following from another forum may help ... grommet?


"Also, you should check to make sure your engine compartment temp sensor hasn't come loose and is resting on the engine or other hot part. This could be causing the fan to come on unnecessarily. If it is actually coming on due to being that hot, there could be a different problem.

The compartment sensor is #12 in the diagram, it should be in a rubber grommet right on top of the engine between the #4 & #5 intake plenums. You can't miss it, the  connector easily seen just by opening your engine bay lid.


"Switch-on conditions for engine compartment fan (this fan pulls air into the enginecompartment) The engine compartment fan is switched on when the engine compartment temperature is > 176 degrees F or the coolant temperature is > 216 degrees F. 
If the ignition is switched off and the engine compartment temperature is more than 140 degrees F, the  DME control module remains in readiness for another 20 minutes. During this time, the engine compartment temperature is retrieved every 10 seconds. If the enginecompartment temperature is > 185 degrees F, the engine compartment fan is switched on for 20 seconds. If the engine compartment temperature is still > 185 degrees F after this time, the fan remains on for a further 30 seconds."

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Thanks @wizard. I did find that the engine compartment temp sensor is loose. Can't find where it attaches, so it is possible the grommet or rubber sleeve within which it sits is lost now. Will get one from a dealer.


More concerning, as I inspected the engine, I noticed signs of a leak. My AOS was replace a few months ago, and then I don't remember seeing these leaks. The body of the power steering tank is wet and there seems to be some liquid pooling on top of the compressor below it. Further the lines shown in the photos also seem to leak (AC lines??). what do you make of this? Thanks

2018-06-10 09.02.00.jpg

2018-06-10 09.02.07.jpg

2018-06-10 09.02.11.jpg

2018-06-10 09.02.28.jpg

2018-06-10 09.02.48.jpg

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If your a/c is working well, most likely it's hydraulic fluid. Are the cap and the lock ring tight? Best is to clean up the area well with brake cleaner and monitor the leak.


If it's a/c oil, your refridgerant would have leaked out with that much oil.


The engine oil temp sensor is plugged onto the right side intake manifold runners on a 996. 997 may be similar 

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Late spring, the AC was running weak, and I thought that with an 11-year old car it's par for the course,  so I refilled it a few weeks ago. Did not check for leaks then. The AC is running well now and am wondering if it is going to last.


I like your idea of cleaning it all up and monitor -- so that's what I am going to do next.

Edited by Koenbro

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