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modestot

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    Miami,FL
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  • Present cars
    2010 Porsche Cayenne S

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  1. Thank you very much again. Successfully replaced the thermostat on our '10 Cayenne S using your write-up as guide. Some notes from my own experience: 1) I was completely unable to pull the thermostat by hooking a wire through the spring. No amount of pulling or leverage would do it. In fact, I completely deformed the spring in the process. Made a judgement call that it was not the thermostat that was stuck but the transfer pipe in front of it. I used a Phillips screwdriver as a chisel to push it out from behind with a rubber mallet. Once the transfer pipe was out, the thermostat itself came out easily by pulling with pliers. 2) Replacement thermostat went in relatively easily with some gentle pleasure. Putting the transfer pipe back was a challenge (as you mentioned in the instructions). Rather than a pry bar, I used the water pump itself to push the transfer pipe back in. I did it before putting the new O-Ring on the pump; then undid the pump again and was able to verify that the transfer pipe was flush with the housing as you mentioned. 3) The short vacuum hose at the back of the intake manifold is a pain to get back in place. I managed by letting the manifold sit on top of the block but pulled forward a bit, then blindly connecting the hose and carefully pushing the manifold back in place. 4) I would suggest plugging the engine intake ports with shop rags at all times while exposed. Would be very painful to lose a flying washer through one of those. Didn't really count but I think it took about 5 hours overall. However, a lot of that time was wasted in figuring out how to get the transfer pipe out. I also neglected to install the vacuum hose that bridges across both cylinder banks and spent about an hour debugging the horrible idle that came from it. This is definitely a DIY. Not sure why shops charge so much. I reckon that I can get it done in under 3 hours if I were to do it again. Time will tell if this addresses the P8121 permanently.
  2. Hi there, Great write-up, clarifies a bunch of things about how to get to the thermostat. By chance, did you set out to replace your thermostat to address a P2181 trouble code? If so, did you have a method to eliminate the coolant temp sensor as a potential cause before setting out to replace the thermostat? Thank you!!
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