Dan's original owner '01 dual duty M3

[Slideways]

Please elaborate. I replaced my older IHKA with a newer module, appears to function just fine.

Some standard E46s did not get the aux heater control valve that all M3s have. I believe the aux pump heats the cabin faster (not 100% sure), so you probably won't notice a difference.

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/14592-deleting-auxiliary-water-pump

[PSUEng]

Once you install another IHKA, it is a good idea to code it to your car by writing a blank .man file using NCSExpert.

Please elaborate. I replaced my older IHKA with a newer module, appears to function just fine.

[01M3Fan]

I brought it to my body shop (Sublime Restorations) and they have amazing paintless dent tech that they were able to bring in.

[01M3Fan]

So Covid brain fog is a real thing…. Getting out house painted & needed to pull the A/C from garage window.

Cleared a space on the workbench and pushed the welder back - but not enough…. When I pulled the A/C the accordion wing popped out & caught the welding rods & I knocked the welder into the M3. 😭 Lookis like the gas tank hit the fender.

[01M3Fan]

I haven’t dipped my toe into coding yet…. I’ll have to reach out for help on that

[Slideways]

I’ve got two 2004 HVAC units as spares - what elements would change?

Nothing, the only three things that differ from the old and new unit are the temp and fan speed buttons are two separate buttons on the new version and the backside of the newer unit is much more compact. Once you install another IHKA, it is a good idea to code it to your car by writing a blank .man file using NCSExpert.

[01M3Fan]

I’ve got two 2004 HVAC units as spares - what elements would change?

[Slideways]

Any updates on codes? I replaced my FSR last year, but now my symptoms are 1] actual fan speed does not change with control button pressing 2] the entire control unit will just turn off, but I can turn it on later; all fuses are good. When the HVAC is OFF I hear this noise from he HVAC box, suggesting something is running, or attempting to--damn near thought I had a mouse in there!

I hope it's not the IHKA, and just the fact I cheaped out and put a non-genuine FSR in it.

The updated IHKA unit is pretty cheap used. Also, it is an easy unit to swap out and test if you have another E46 around.

[01M3Fan]

My HVAC has been behaving the last 2 weeks, so I haven’t dove in to pull the codes yet.

I just dropped the car off at the shop for paintless dent removal - that’s another story…

[PSUEng]

Any updates on codes? I replaced my FSR last year, but now my symptoms are 1] actual fan speed does not change with control button pressing 2] the entire control unit will just turn off, but I can turn it on later; all fuses are good. When the HVAC is OFF I hear this noise from he HVAC box, suggesting something is running, or attempting to--damn near thought I had a mouse in there!

I hope it's not the IHKA, and just the fact I cheaped out and put a non-genuine FSR in it.

[01M3Fan]

Thx - I’ll put my code reader on it before I buy anything.

[Slideways]

I basically won’t do anything you want…. Fan speed & temp control are lost - sometimes fan speed goes up, then down. A/C blows cold, then doesn’t. Will work fine for days, then go skitzo again.

Since yours is an 01, you will have the older IHKA module (climate control panel). If it is resetting the fan speed and temp back to default all on its own, it could be that. You can also read the module for codes using INPA.

[01M3Fan]

I basically won’t do anything you want…. Fan speed & temp control are lost - sometimes fan speed goes up, then down. A/C blows cold, then doesn’t. Will work fine for days, then go skitzo again.

[Slideways]

So my HVAC system lost its mind - time to replace the final stage resistor (again).

I’ve got some used ones in the attic from my M3 wagon project - so I’ll try one of those first.

What is the issue with the HVAC system?

[01M3Fan]

So my HVAC system lost its mind - time to replace the final stage resistor (again).

I’ve got some used ones in the attic from my M3 wagon project - so I’ll try one of those first.