Only blowing hot air except when on "lo"
11-21-2015, 07:57 PM
#1
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Thread Starter
Only blowing hot air except when on "lo"
My 2008 cayenne s only seems to have two temperature setting. When I have the climate control set to "lo", it blows cold air, as works normal and all of that. When ac is off, temp obviously depends on the outside temperature but at the moment it's pretty cold. As soon as I turn it up to 61 degrees however, it blows hot air only and does that the entire time. I'm guessing that maybe some kind of interior temperature sensor is faulty and therefore it always thinks it's cold. But hopefully someone can point me in the right direction and let me know if this is something I can fix myself or if it requires a dealer visit. Thanks!
11-24-2015, 09:43 PM
#3
Rennlist Member
I would look at the simple things first.
In a seprate thread, I shared my story of a dealership replacing a cabin air filter and not replacing the temp sensor in the correct place. My dealer finally ID'd the error and fixed it.
Have you checked all of the fuses even remotely related to the HVAC system.
Have you disconnected the positive cable to the battery and then reconnected to force a reboot of the many many computers onboard, some are related to HVAC?
Have you tested the battery and alternator output?
Some automakers design in failure modes. Porsche may have designed in a failure mode of no heat to 100% heat to defog and defrost until you can get to the shop.
In a seprate thread, I shared my story of a dealership replacing a cabin air filter and not replacing the temp sensor in the correct place. My dealer finally ID'd the error and fixed it.
Have you checked all of the fuses even remotely related to the HVAC system.
Have you disconnected the positive cable to the battery and then reconnected to force a reboot of the many many computers onboard, some are related to HVAC?
Have you tested the battery and alternator output?
Some automakers design in failure modes. Porsche may have designed in a failure mode of no heat to 100% heat to defog and defrost until you can get to the shop.
11-25-2015, 01:02 PM
#4
AutoX
Thread Starter
I would look at the simple things first.
In a seprate thread, I shared my story of a dealership replacing a cabin air filter and not replacing the temp sensor in the correct place. My dealer finally ID'd the error and fixed it.
Have you checked all of the fuses even remotely related to the HVAC system.
Have you disconnected the positive cable to the battery and then reconnected to force a reboot of the many many computers onboard, some are related to HVAC?
Have you tested the battery and alternator output?
Some automakers design in failure modes. Porsche may have designed in a failure mode of no heat to 100% heat to defog and defrost until you can get to the shop.
In a seprate thread, I shared my story of a dealership replacing a cabin air filter and not replacing the temp sensor in the correct place. My dealer finally ID'd the error and fixed it.
Have you checked all of the fuses even remotely related to the HVAC system.
Have you disconnected the positive cable to the battery and then reconnected to force a reboot of the many many computers onboard, some are related to HVAC?
Have you tested the battery and alternator output?
Some automakers design in failure modes. Porsche may have designed in a failure mode of no heat to 100% heat to defog and defrost until you can get to the shop.
I was trying to find the location of the interior temp sensor but wasn't able to find in. Anyone know where that might be?
11-27-2015, 10:28 AM
#5
Rennlist Member
My 2011 owner's manual showed me my location. a small round red sensor to the right of the steering column.
There are also multiple sensors behind the dash in the duct work.
There are also multiple sensors behind the dash in the duct work.