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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Sep-16-2018, 05:58:20 PM   #1
M3AZ
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Question Help with heater core delete

I've come across a few DIYs for replacing the heater core, such as this one https://forum.e46fanatics.com/showthread.php?t=1075889, but nothing for a complete delete.

It looks like I need to remove the entire metal crash bar assembly under the dash to pull out the entire heater core assembly. However, there are two shear bolts attaching the steering column to the crash bar.

Any tips on removing these bolts? Can I replace them with standard bolts when I'm done?

Is it necessary to drain the entire system of coolant as the Bentley manual states? My carpet has been removed so I'm not concerned with spilling a little on the interior.

If anyone knows of a good DIY for this please post it here. Thanks!
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Old Sun, Sep-16-2018, 10:28:00 PM   #2
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Default Re: Help with heater core delete

You have to remove that whole bar to be able to pull out the Air Con / Heater unit housing.

I only had one crash bolt on my steering column the other one was standard... the crash bolts aren't in with a lot of torque... I used a metal chisel on the edge to tap in slots that I could then tap in an unscrewing direction to get it out... The hardest one was the first one to get it moving... after that just kinda tapping in a roughly unscrewing direction and it started to come out. I replaced them both with standard 8.8 fasteners.

When you pull the Air Con / Heater unit out you will need to split it open and then remove the core and the core feed lines (I imagine you will be doing the re-routing to delete feed to the heater in the engine bay).

Will you be deleting the Air Con at the same time? If you are it is probably easier to just remove and delete the whole Air Con / Heater unit and then fabricate a cover plate for the firewall to replace it. The unit is quite heavy, even with the heater and evap core removed.
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Old Mon, Sep-17-2018, 01:06:04 AM   #3
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Default Re: Help with heater core delete

Quote:
Originally Posted by STAATS View Post
You have to remove that whole bar to be able to pull out the Air Con / Heater unit housing.

I only had one crash bolt on my steering column the other one was standard... the crash bolts aren't in with a lot of torque... I used a metal chisel on the edge to tap in slots that I could then tap in an unscrewing direction to get it out... The hardest one was the first one to get it moving... after that just kinda tapping in a roughly unscrewing direction and it started to come out. I replaced them both with standard 8.8 fasteners.

When you pull the Air Con / Heater unit out you will need to split it open and then remove the core and the core feed lines (I imagine you will be doing the re-routing to delete feed to the heater in the engine bay).

Will you be deleting the Air Con at the same time? If you are it is probably easier to just remove and delete the whole Air Con / Heater unit and then fabricate a cover plate for the firewall to replace it. The unit is quite heavy, even with the heater and evap core removed.
Thanks! Yes Iím planning to remove the AC as well.
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Old Mon, Sep-17-2018, 02:20:20 AM   #4
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Default Re: Help with heater core delete



These?

I used a pipe wrench


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Old Mon, Sep-17-2018, 04:57:15 PM   #5
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Default Re: Help with heater core delete

I didn't drain the coolant when I removed the heater housing. Had no issues with spilling. Just don't tip the core too much and keep the ends of the 2 coolant hoses elevated when you disconnect them from the firewall.
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Old Tue, Sep-18-2018, 02:34:44 PM   #6
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Default Re: Help with heater core delete

When I went to replace my AC evaporator (lives in the same housing under the dash as the heater core), I was puzzled by those safety bolts in the steering column, but, in the end, we realized that we didn't need to take them out at all. We were able to maneuver the frame around the steering column enough to get everything out. This was in a vert, though, maybe coupe is different?

I also didn't drain coolant. You'll lose some when you disconnect the two hoses that go to the heater core, but if you wait for that to drain out, and are careful in lifting the IHKA housing out, you'll be fine.
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Discussing Help with heater core delete in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)