That write up looks familiar
Wait a minute... I wrote it

Nick, I did not have to relocate the sensor. Try the troubleshooting part I describe in the write up and if you can determine you have a bad sensor, just replace it, don't worry about relocating. I did not have to relocate mine and now it works just fine, and Arkansas is very hot and humid in the summer...

 

There's really not much technical to it.
1. Open bonnet
2. remove right side pollen filter and cover
3. Remove sensor from top of evaporator box.
4. push sensor straight down into the hole it came out of
5. reach into evaporator box through the pollen filter housing with hemostats or long needle nose pliers.
5. take long needle nose pliers or hemostats and insert sensor into middle of evaporator core.
6. replace pollen filter and cover.

 

oh yeah. you might test your sensor for proper operation by sticking it into a slurpee before you complete steps 4-6. Actually, I'd do it before step 2.

 

Or an ice cold beer... after flying only !

Hi Rick! Coming to the Jet Center in Little Rock soon?

 

OK, thanks for the feedback guys. First I will check the sensor operation following the trouble shooting guide. Was planning to do but also wanted to know how to do the rest should the sensor proove to be OK.
Per Falcondrivr instructions it appears that the sensor does not need to be lengthened as such, just repositioned to a colder part of the evap. To insert the sensor into the evap core are you physically bending the sensor then?
No doubt once I am in there it will be more obvious. Thanks so much for the tips :-)

 

So, I dug in and went through the above. My Evap sensor tested good giving the correct vlaues at ambient and freezing temperatures.
I pulled out the right side pollen filter and as you say you can just see the end of the evap temp sensor. Mine was already inserted into the evap. The sensor is not that long and so moving it lower down the evap core seems impossible without a longer sensor or some surgery. I put a slight bend on the sensor to ensure it was going as deep as poss into the EVAP.
So far tests show air is cooling down to 40 degrees farenheit and compressor can be seen to cycle on and off as it should to prevent freezing. I will keep testing it now for a while and see how it goes. I'll let you guys know if the probelm re-occurs, I have my fingers crossed. Thanks for all your help and input. Nick

 

Back around 1996 a PCNA regional service rep. told me when using the AC to turn the temp. control all the way to cold then back one click. Doing this he said this would keep the condenser from freezing. I wasn't having a problem he just pointed this out.

 

Racing Flyer & Falcondrivr

Hey guys just wanted to express my gratitude for the info you provided on this fix. I've been running the Targa for the last couple of weeks since making this mod and the AC is functioning perfectly. I was out today in HK and it was pretty hot out, the AC functioned beautifully, lovely and cold on an extend drive over two hours, I couldn't have expected any more. No sign of the old problem recurring.

I did chat to the Porsche dealer about this before trying the fix. I discussed your advice with them when I had the oil changed three weeks ago. They wouldn't comment, only to say that after their test drive and in their experience the best thing to do would be to go ahead and change the condensor and while they were at it change the evaporator. They duly quoted HK$43,000 (US$5,500) for the privelidge.

Your fix took a couple of hours including pulling the HVAC and testing the EVAP temp sensor to verify correct operation. Cost, nothing, although I did change the pollen filters while I was in there.

Anyhow, a very big thanks to you guys. Rennlist is an incredible resource, makes Porsche ownership so much more fun and fullfilling :-)

Nick

 

i love a happy ending !