AC / heat in rear seat

[John Acosta]

I have been trying this since I read Leerroy's post a few weeks ago, and the HVAC system has been working reliably, ie without the rear furnace, so there maybe something to it!

In addition, other systems, like the start/stop, have also been much more consistent with what I would expect, and I haven't had the cooling fans screaming at full speed either.

There was once when I didn't follow 'Leerroy's start-up procedure' (yes, that's its name), and the rear vents started blowing hot, but after pulling over and starting up with the procedure, all vents were blowing cold again.

It would be great if others who are having the rear furnace problem give this a go to see how consistent it is and let us know on the forum here.

With more feedback and data, Ineos may actually be able to work out what is happening and eventually develop a fix.

Thanks a million! I will try this today…
Frustrating how we have to perform these work arounds.

 

[Commodore]

I made it 24 hours and 52 miles into ownership and have the full furnace effect in the rear vents and cool ( but not cold) air in front. Letting it sit and will try the previously mentioned start up procedure. Already called the dealer.

 

[G-Man]

I hadn't seen this thread before or I would have responded earlier: I had the same problem and had my Grenadier shipped to the dealer twice, they were not able to solve it. Eventually through trial and error I found a work-around that avoids the issue.

You are now a pilot - you have a pre-departure and pre-shutdown procedure you must follow, here it is:

1) Before starting the Grenadier confirm:
All three HVAC dials are turned completely counter clockwise (i.e. fan off, full cold, front vents selected).
Turn the ignition one click (i.e. before the turning the engine)
Allow all the warning lights to go off (one or two will remain, but essentially you are letting the computer wake up and do its self-checks before turning over the engine).
Now start the engine.
Make sure the a/c compressor is on
Don't use the auto function
Adjust the fan and temp and vent selectors to preference

2) Before shutdown:
Return all three HVAC dials to the full counter clockwise position.

If the problem happens again (it has for me a few times when I forgot step 2), go to step 2 and then shut down the engine. Before going back to step 1, leave the ignition fully off for at least 3 and a half minutes (that is how long it takes the computer to fully shut down).

Doing this has been 100% successful in avoiding and correcting the problem.

So I have tried this for a week and it absolutely 100% works for me. However it is a pain in the ass to remember to do each time and my better half thinks I'm some kind of obsessive nut case so it's a temporary fix at best