temp gauge was not reading then reading sometimes with red light flashing . I replaced the coolant temp sensor and the gauge has no reading and the red light is on. any one have any info on this problem 2007 cayman s

 

Have you checked the coolant level? Is it ok?


While I don't think the issue is related to low coolant you should always eliminate that first.


Since you replaced the sensor and assuming you did this right and are comfortable you connected the sensor to the wiring harness my WAG is the problem lies with the instrument cluster.


However, before moving the instrument cluster it might be a good idea to get an OBD2 code reader/data viewer and view the coolant temperature in real time and verify the reading is ok while at the same time the temp gage and warning light are doing their crazy act. There could be a problem with the sensor, its connection to the wiring harness or a problem from the connector to the DME.


If you eliminate the sensor and the signal path from the sensor to the DME, this leaves AFAIK just the instrument cluster. However, one wants to be sure though for there are no real field serviceable items in the instrument cluster. SOP is if it is suspect to replace first and ask questions later. But price the parts/labor cost for that first and you'll know why you want to be sure before you proceed.


How to be sure?... Well, with the Porsche diagnostics computer perhaps a scan of the DME and instrument cluster controllers would turn up one or more error codes that would help with the diagnosis?


You can if you want and are careful -- lots of sharp edges up there -- reach up and gently try some pulling/wiggling of the wiring to see if there is any reaction at the gage or the warning light when you test a wire or connector. You might just find a loose connector. Be gentle. Leave the gorilla suit in the closet. You do not want to create another problem by indiscriminately yanking on wiring connectors and wiring.

 

Thanks for the reply ,after about two hours and a multi meter I found a cut wire. The factory had the harness pulled tight and it cut against the block casting problem solved