Hi All, last week I noticed my "new to me" 996.1 C2 3.4 m/t, temperature gauge was slightly higher than I am used too when sitting in traffic (all the cars I had always sit on the middle or just below but this is my first Porsche).
After reading lots of threads about resistors, relays etc. I thought maybe both resistors where faulty. I did quite a comprehensive test and this is what I found out:
[*]40amp Fuses are both ok. Car does not has the original resistors, but has the RS components gold resistors that a lot of people tend to fit when the originals go bad.[*]Relays are all ok, tested all 4 in all 4 different position and I could hear/feel them click. [*]Jumped each relay connection point and I could hear the fans turn on. I am also using the HVAC controller hidden menu to monitor temps rather than using the gauge. [*]Fans will come on after I switch A/C on. When the car is cold >93 deg C the low speed relays click and the fans switch on. When the car is hot <93deg C the high speed relay click and the fans switch on. [*]I thought at this point the fans where switching on only when the A/C was switched on, but I left it idling with the A/C off and when the temperature hit 108deg C the high speed fans switched on and the decklid fan also switched on. (I took some pictures of the temperatures when this happened please see images attached)[/LIST]At this point I am not sure what to think. Fans seem to be operating "normally" I guess, but the temperature gauge does seem a bit high to me. I did a mixture of slow city driving + car stop idling for quite a while to achieve this temperatures. Is this normal and I am being way too paranoid? Or is it worth taking it to a specialist to have a look at it? I thought I asked before I embark on the journey of start to change resistors/fan units.
I read that 3.4 models have a more realistic temperature gauge that moves up and down more noticeable than the 996.2 but again I could be wrong. The car had a new water pump/radiators in 2020. And the AC Conders are also relatively new (installed 2022), so I will probably say there is not a huge debris build up.
Many thanks for your help!
After reading lots of threads about resistors, relays etc. I thought maybe both resistors where faulty. I did quite a comprehensive test and this is what I found out:
[*]40amp Fuses are both ok. Car does not has the original resistors, but has the RS components gold resistors that a lot of people tend to fit when the originals go bad.[*]Relays are all ok, tested all 4 in all 4 different position and I could hear/feel them click. [*]Jumped each relay connection point and I could hear the fans turn on. I am also using the HVAC controller hidden menu to monitor temps rather than using the gauge. [*]Fans will come on after I switch A/C on. When the car is cold >93 deg C the low speed relays click and the fans switch on. When the car is hot <93deg C the high speed relay click and the fans switch on. [*]I thought at this point the fans where switching on only when the A/C was switched on, but I left it idling with the A/C off and when the temperature hit 108deg C the high speed fans switched on and the decklid fan also switched on. (I took some pictures of the temperatures when this happened please see images attached)[/LIST]At this point I am not sure what to think. Fans seem to be operating "normally" I guess, but the temperature gauge does seem a bit high to me. I did a mixture of slow city driving + car stop idling for quite a while to achieve this temperatures. Is this normal and I am being way too paranoid? Or is it worth taking it to a specialist to have a look at it? I thought I asked before I embark on the journey of start to change resistors/fan units.
I read that 3.4 models have a more realistic temperature gauge that moves up and down more noticeable than the 996.2 but again I could be wrong. The car had a new water pump/radiators in 2020. And the AC Conders are also relatively new (installed 2022), so I will probably say there is not a huge debris build up.
Many thanks for your help!