760 GLE 1990 B280E ECC (working, sometimes)

[diccapilly]

Hello all,

And Happy New Year.

The Electronic Climate Control, sometimes it works sometimes it does not and receive the flashing blue light - generally with a 133 diagnosis code but the code can vary.

I cleaned the sensor in the overhead dome light.

That fixed it for a few weeks.

The second thing I did was to solder dry joints in the vacuum controller.

That fixed it for a few weeks.

I am now wondering about the vacuum non-return values, there are two, inside the engine bay close to the firewall.

Could they be a red herring or could they be responsible for the intermittent problem?

Any thoughts, ideas most welcome.

Thank you.

[Laird Scooby]

Originally Posted by diccapilly

Hello all,

And Happy New Year.

The Electronic Climate Control, sometimes it works sometimes it does not and receive the flashing blue light - generally with a 133 diagnosis code but the code can vary.

I cleaned the sensor in the overhead dome light.

That fixed it for a few weeks.

The second thing I did was to solder dry joints in the vacuum controller.

That fixed it for a few weeks.

I am now wondering about the vacuum non-return values, there are two, inside the engine bay close to the firewall.

Could they be a red herring or could they be responsible for the intermittent problem?

Any thoughts, ideas most welcome.

Thank you.

The NRVs do fail, be warned, some are 10mm diameter so not easy to find but they are available. I had to replace mine for a similar reason and also that under load (accelerating or driving up a hill or similar) suddenly the airflow would cease from wherever it was meant to be coming from and little or nothing escaped into the car in the form of air.

I'll try and find an ebay link to the ones i used later, for now it's time to give the hound her daily constitutional!

[diccapilly]

Thanks Dave,

very much appreciated.

I've found this link

https://www.onlinecarparts.co.uk/oenumber/1228272.html

but I am unable to confirm the size until I get them out - they are probably the original set and are proving to be extremely stubborn.

Aargh.

[Laird Scooby]

As promised, ebay link to the NRV i used :

https://www.ebay.co.uk/itm/Non-Retur...e/272996189672

They have 6, 8, 10 and 12mm valves and they can be stripped down for cleaning/inspection.

Yes, they're a bit bigger than the OE valves and i would have added a pic but my internet is on a go-slow so can't find the pics i need to do that just now.

There is an arrow on them that should point towards the suction source (inlet manifold but take ito account there are T-pieces in the whole arrangement) but they're a "plug'n'play" job to change.

[diccapilly]

Hi Dave,

Thank you for supplying the link to the NRV replacements.

Much appreciated.

Regards

Steve

[diccapilly]

Hi,

Just to let you know.

I finally got them both NRV out and they are 12mm.

Regards

Steve