Air Con Max

[ronk]

On my 335 there is also a MAX button
It has started to play up recently- if I press it, the system goes to max chill (16°c) but only runs for a few minutes the system seems to go very limp ie the max blow goes off.

Switching back to normal mode I can dial in a low temp and it blows cold - I suspect a dealer trip and a £250 contribution to the insurance.

I’m hoping it might be low refrigerant as it has never been topped up since new - 8years!

I’ve done an internet trawl but found nothing to give me any clues.

 

[Rockhopper]

MAX sometimes does other thing like setting it to max fan and turning the heated rear window on. Battery issue?

 

[ronk]

The battery is old (6) but this was on a hot day and no other real current draw. The car is Diesel and cranks strongly.
The hard blow stopped while driving and came back on after a few seconds on one day but stopped and didn’t today.

As I said, I’m hoping it could be low refrigerant?

 

[Pondrew]

If it blows really cold in other scenarios Ron, it's not a refrigerant issue. The refrigeration circuit is a "works or doesn't" kind of thing; the controls are another matter.

 

[ronk]

It blows cold! So I suspect a bit of electronic skullduggery :thumbsdown:

 

[Pondrew]

Imagine that with a BMW, eh?

 

[ronk]

I’ve got a warranty with a £250 excess so it’s not the end of the world .