Rear fan runs long after engine is shut off

[royp4]

Hi all,

I have noticed that after my last service at the dealer the engine runs about 8 degrees warmer (about 220f) and the rear fan runs for extended periods after I shut the engine off. The oil pressure also seems to be lower than it was before the service, which included oil change, coolant flush, and coolant replacement. Any ideas on why this might be happening would be greatly appreciated. Thanks in advance.

[DBJoe996]

What did they fill it with?  Oil type and weight such as 0W-40?  The sensor for the engine bay fan is located between the intake runners on the top passenger side of engine.  There is a rubber grommet that it fits into.  If it falls out, it rests against the engine and when hot, will make the fan run.  How is your coolant level?  Did they vacuum fill the system?  Have you tried "burping" the coolant system by manually lifting the bale wire on the coolant tank?

Edited September 17, 2019 by DBJoe996

[royp4]

Thank you for your excellent questions. Oil is 0W-40, fully synthetic. I will check your other suggestions. I truly appreciate your time and willingness to help. I'll update the answers to your other suggestions. Again, I thank you for your help.

[royp4]

I checked the things you suggested but didn't find any of the problems you mentioned. Time for 130k service so guess I'll have to suck it up and visit the dealership. Thanks for taking the time to help.

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[DBJoe996]

I do my own oil/filter changes.  I did run Mobil 1 0W-40 for a long time.  Last oil change I changed over to Liqui-Moly Leichtlauf SAE 5W-40 and my engine is so much happier.  Seems to run better (seat of the pants) and quieter.  The reason was I am at 146K mileage and a bit heavier weight oil seems necessary.  It is on the approved Porsche list for our cars.  Might ask the dealer about it.  I think the Porsche oil released for our cars is a 5W-50.

Edited May 18, 2020 by DBJoe996