Cooling System Fault
#1
Rennlist Member
Thread Starter
Cooling System Fault
I'm having a bad time.
I have taken the car in twice now for this issue. Apparently it's a bad changeover valve...but there are many in the car, so it's hard to nail down.
Can anyone offer troubleshooting anecdotes for this fault I can pass on to service?
I have taken the car in twice now for this issue. Apparently it's a bad changeover valve...but there are many in the car, so it's hard to nail down.
Can anyone offer troubleshooting anecdotes for this fault I can pass on to service?
#2
Rennlist Member
Presumably they are following the TSB?
#3
Rennlist Member
Thread Starter
#4
Rennlist Member
There's only 8 in the car I do believe. (corrected)
I know when mine faulted I did not have any heat inside the car.
Another popular valve to fail is the one that works the PSE.
I know when mine faulted I did not have any heat inside the car.
Another popular valve to fail is the one that works the PSE.
Last edited by CSK 911 C4S; 01-09-2017 at 02:34 AM.
#6
Burning Brakes
There is no TSB for the COV failures on cars beyond 2012.5.
For a comprehensive "overview" of COVs check out my blog post on this subject. Porsche 991 COV & Vacuum Lines Overview
For more reading enjoyment, you can also check-out WM 2400IN which is the official Porsche document on the COV and Vacuum Lines in the 991.1 cars.
DM me if you need more....
For a comprehensive "overview" of COVs check out my blog post on this subject. Porsche 991 COV & Vacuum Lines Overview
For more reading enjoyment, you can also check-out WM 2400IN which is the official Porsche document on the COV and Vacuum Lines in the 991.1 cars.
DM me if you need more....
#7
Burning Brakes
You only see one COV assigned to engine coolant, but note that there are multiple COVs tied to the same mechanical vacuum pump and vacuum lines. For that reason when you lose a COV to the exhaust flaps for example, you will receive an "Engine Coolant" system failure warning when it really doesn't have anything to do with your coolant system....
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#8
Burning Brakes
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
8. Shut-Off Valve for Clutch Fluid Heat Exchanger (PDK ONLY)
9. Tuning Flap (cars with full X-51 Power Kit ONLY)
10. Tuning Flap (cars with full X-51 Power Kit ONLY)
#9 and 10 are not a mistake on my part.... cars with X-51 option have multiple tuning flaps.
#10
Rennlist Member
You only see one COV assigned to engine coolant, but note that there are multiple COVs tied to the same mechanical vacuum pump and vacuum lines. For that reason when you lose a COV to the exhaust flaps for example, you will receive an "Engine Coolant" system failure warning when it really doesn't have anything to do with your coolant system....
#11
Burning Brakes
Each time I've had a coolant fault appear on the '14 C4S it was a COV - exhaust flaps or heat exchanger.
#13
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Wow, I need a COV warranty. 10? Crazy. I see some out of warranty COV repairs in my future.
#15
Rennlist Member
i had a Coolant Failure fault due to COV, the repair ticket said they replaced 3 COVs. I thought they had a way to check them and found 3 out of spec. Now I'm wondering if they weren't just replacing COVs until the fault went away and they got it right on their third try.
I hope that's not the case because it could get expensive trouble shooting this on your own after warrantee.
I hope that's not the case because it could get expensive trouble shooting this on your own after warrantee.