howdoes the Aux fan tie-into the IHKR
 

Added photos:
Attachment 85065 HVAC controls, rear of console

Attachment 85066 IHKR, Northern Hemispere version, I presume

Question: Comparing the IHKR to the IHKA in the Bentley manual, I don't see where the Aux fan is represented in the input/output chart shown, but it is clearly shown in the IHKA chart. Am I missing something?

The aux fan is an output for the DME.

The compressor on/off wire going to the IHKR from the DME might be something to look at. Some more reading about how it works (is there anything bus controlled on the IHKR??) and knowing what modules are being read and activated would help.

https://www.instagram.com/reel/DN7BI...5paHdoN2l3OTcz

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how is replacing the schrader valves going to help me?

It's not your issue, but since you're working on your system, doing additional preventive maintenance is a good/common thing...

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A $3 part is very common for A/C failures. I've saved probably 70% of non working A/C systems by replacing core valves. Even when shops have recommended compressor replacements. If a vacuum holds -28 Hg, the leak location is probably a valve core. Some OE designs have only one seal. Replacement cores can have two seals. As a test, use a tool to tighten the cores. If the tool turns even a fraction, the leak location is likely there. If I vacuum a system, I change the cores. I've fully charged systems only to have a core leak. It's good preventative maintenance to change out cores.

If diagnosing isn't your strong point and you want to use the parts cannon then replacing the dash control (IHKR) might be a good guess especially if you can get one for cheap at a wrecker. If you get lucky you might even find a good compressor, maybe one that has been replaced.

I think the manual air might not use the variable displacement compressor so something else to check into as well.

Hey X5chemist - I'm curious which brand of cores you use and/or recommend. I've never been able to discern which newer replacements have two seals. I generally stick with OEM, but BMW OEM cores look like they still have just the one o-ring (if product photos can be trusted, anyway).

Best regards,
Chris

2005 X5 30. Schwarz Black
2002 X5 3.0 Titansilber

Mine has Santech 64536922944 cores. It's a two seal type. One seal is where it touches the port. The other seals the bottom where refrigerant enters. Rub A/C oil on the seal when replacing them. I think the OEM seals are dual seal types. Single type seals are 90's and older types. More like, they do have two seals. The second seal is inside the core. Newer styles have a visible seal mostly at the lower core portion. Cores are much larger too.