Running Hot

[mdreef]

Advice Needed Please!  

 

I have a 2001 996 Carrera Cabriolet with 133,470 miles and a coolant temperature issue (see photo of gauge at 75F ambient temperature after sitting idle for a few minutes)

 

This is what I have replaced related to cooling system within the past 5,000 miles:

 

• Water Pump
• Thermostat & Housing (stock thermostat)
• Coolant Expansion Tank and cap
• Coolant Level Sensor
• Coolant (Pentosin)
• Left Side Ballast Resistor
• Cleaned both Radiators

 

Both front radiator fans come on at low and high speeds and both ballast resistors are working fine.  What could possibly be the cause of this problem?  Do I need to replace the coolant temperature sensor? Or is there another possible problem? 

 

Also, I noticed that my deck lid fan doesn't ever come on even though I tested it and got it to come on by touching the engine compartment sensor to a hot engine component. The engine compartment sensor is properly seated in the passenger side manifold as it's supposed to, but even at high temperatures the fan will not come on.  Any ideas?

 

Thanks in advance for your help!

 

 

 

[Ahsai]

Have you tried using an OBDII reader to read the engine temp? Also I think you can read the engine temp on the climate control.

 

Did the fans come on when you took the photo?

[wizard]

Has this arisen suddenly or has it been an issue over a period of time? If the latter, had you just replaced something when the overheating started to become an issue?

 

Is the waterpump a Porsche one?

 

 

[mdreef]

Thanks for your help - I think I got to the bottom of it... I needed to properly burp the cooling system, which I have now done and I'm pleased with the results.  I appreciate everyone's help!

 

 

[judgejon]

great.  good find.  your area does get a little bit warm.  Consider adding Water Wetter to coolant if any topping up is needed.