Sagging Roof bellows in hot weather - experiences

[vbk1975]

I would never presume that to work. If I was programming the system, it would be like:

1. Car is turned off
2. Is roof up? Yes - start timer. No, do nothing.

To extend this slightly, i think this is the likely sequence

Autocorrect

1.Use Button to open roof, Roof Opens, Both Open Sensors Detected, Release Button (Or Hold) and Pump keeps going until roof pressurised. (Electrical Current exceeds the number of Amps that is required to drive against the check valves)

2. Ign Off (Timer starts)

3. After X mins roof is checked.

- If Roof Sensors are showing fully open - do nothing

- If Roof Sensors are not recording fully open - drive pump until sensors recorded and roof pressurised.

Keep repeating 3. every X mins (First check and subsequent check times could be different)

If Ign is switched on, then cycle starts again at 2(ie timer reset) when Ign is switch off.

if Roof Lowered by User (Button) then No Auto Correct

 

[DianeM]

Lights out, they went out as we went to bed and the autocorrect kicked in during the night.

Our roof has dropped about 3cm a day measuring at the stiffened part just at the end of the mattress, on the passenger side, 1cm on the drivers, it has never auto corrected we haven’t left it any more than that as it would make lifting the roof bed awkward, we have lowered and reset ourselves as we are not willing to leave it any longer, we have had no issues with lighting.

View attachment IMG_0008.jpeg

 

[DianeM]

The auto correct works seemlessly when you leave the vehicle alone. Put the roof up, take the keys out and at 10 hours it will re-inflate if necessary. And then at every 5 hours. Once it doesn't need to correct it never checks again.

Whilst not documented, the timer appears to be disabled by turning the ignition on. I think there are other functions that also cause this reset.

I think the TPI is documented in this thread in that the roof has to fall 20cms in 72 hours. Of course leave the vehicle alone and it auto corrects so you never meet the VW criteria. Unless it's massively broken.

Also I think autocorrect only kicks in at the point the lights switch off. So if they switch off at 10 hours and 1 minute, no re- inflation.

There are a lot of I thinks there, if I was sleeping under a roof that had dropped 20cm I’d have a panic attack

 

[Hawthorn37]

Ours drops enough in the day so that in the evening the lights don’t work. It doesn’t autocorrect though. A van we hired in 2021 did auto correct at night, and it was a noticeable sound. We reported the sagging and lack of auto correct at a service during late 2024, but the dealer said VW won’t sanction any work, not even looking into the auto correct function, unless it drops 20cm