Needsdecaf

Holy Crap!

Hey R_Rated, this look familliar?

Porsche heater changeover valve:




Volvo S60 / V70 R Turbo control (wastegate) valve:



This was a super common failure point on the 2004-2007 Volvo R's. All the forum guys replaced this thing ASAP with an aftermarket unit. Son of a gun, it's still around and it still sucks!

Grunty

So what you are saying is or Porsches have turbocharged heaters!

STG

I didn't want to deal with any drama in the future on my 2012.5

I had all of them proactively changed at my cost. See my info in that link. Some had been replaced under a campaign, but Porsche was still trying to get rid of the previous versions first even though a newer one was out

Hurricane

Mine on my first 991S (a 2012.5) were changed with a campaign in Nov of 2013.....and when I had the car in fall of 2014, the replacements failed for the heater and the PSE. Replaced under warranty.

I asked the dealer what happens if they would fail again but outside the warranty and they told me (no guarantee) that most likely they would be covered under good will. I would be shocked if the OP wasn't taken care of with good will for the silly COVs.

GregD

prepare to be shocked - he hinted they would try but since I am the second owner all bets are off... If the dealer does not help, I'll let them do one and from then on I'm off to an independent to proactively do the rest (at least the coolant one, possibly myself, doesn't look that hard once bumper is off)....

Hurricane

In my case, I was the second owner but the dealership has always treated me well - never as "the second owner." First class service.

Anyways, I wish you good luck with it and am sorry to hear that they failed in the first place (especially right out of warranty). Once they replace the faulty ones, I doubt you would have this problem again.

Cheers!

GregD

Just for grins, it consistently works in the morning, fails in the evening... My guess is heatsoak from the engine dries up the unit overnight. But rain (it's been non stop) soaks it again during the day and it fails until the engine heat dries it out again for a while.. No matter, booked for next wednesday, loaner and everything... Only issue might be a "failure to reproduce" if they test first thing int he morning and it works... Ugh.

GregD

Dealer tomorrow AM. My issue is the valve works in the AM and fails in the PM, like clockwork... 7 days in a row. Assuming they play dumb and cannot reproduce, or stick me with a Rev C, or do just that one and not all of them (as they generally do)... I see you can buy the F revision + the harness from suncoast, give or take $75 for both bits...

Can I DYI this without too much difficulty ? I downloaded the locations picture below, wish it was bigger but it's a good start... Based on the list of COVs, I wouldnot be surprised if on top of my heater, the Airbox one was defective (stumble sometimes in acceleration), and I wouldn't mind doing the coolant one proactively... Maybe even the tuning flap (what's that one exactly?)

1. Air Cleaner Flap
2. Acoustic Simulator
3. Heater Shut-Off Valve
4. Exhaust Flaps
5. Coolant Shut-Off Valve on Engine Bypass Circuit
6. Tuning Flap
7. Shut-Off Valve on Heat Exchanger for Gear Wheel Set Oil

Doable ? Drop the bumper or not even necessary ? Has anyone DYI'ed this ?

JPKelz

I think my COV was under a seat. My heater failed last year & was fixed under warranty. A day or so after this the dealer called to say when they replaced the seat, the mechanic hadn't used new fasteners (nuts/bolts?). These are apparently single use so the car was recalled to change these. I concluded that the COV was located under one of the seats however I might be referring to replacement of the illuminated door sills which both failed, I don't remember.

R_Rated

I was just going to post the same thing!

Here is the original:
http://www.vivaperformance.com/genui...50-c30-c70-t5/

And here is a much improved version(I was one of the original testers):
http://www.vivaperformance.com/high-...e-tcv-upgrade/

mmaturo

Timely post. Just had my car in for 40K service and a fault code pointed out my heater wasn't working. It was these things. Under warranty but glad i'm in Florida and do not need heat if it really fails this much. Hadn't noticed it wasn't working.

GregD

you had a code for this??? I did not. They took my word for it though and will replace under goodwill. Emboldened I mentioned the passenger heated seat button sometimes sticks to the windshield airflow button - maybe they'd replace the air control unit too. But I dare not hope :-)

Stevie

GregD, I've removed the rear bumper cover and spoiler several time to service the airbox for another matter. Unfortunately, I've never changed a change over valve so don't know how the connections work. Shouldn't be hard to figure out_Steve

Video by ml414skidoo:

Stevie

GregD, I've removed the rear bumper cover and spoiler several time to service the airbox for another matter. Unfortunately, I've never changed a change over valve so don't know how the connections work. Shouldn't be hard to figure out_Steve

Video by ml414skidoo:

GregD

That was a great video! Thank you very much for taking the time ! Looks easy and I spotted at least 3 COVs already!