Heater core removal - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 07-20-2013, 03:09 AM Thread Starter
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Heater core removal

Hi guys, I need to repair, replace my heater core in my w109 300sel. Looks challenging and I'm looking for some advice of where to start, are there any shortcuts or tips from ppl who have done this before?
Is there anything else I should consider fixing or looking at doing at the same time of this repair?


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post #2 of 7 (permalink) Old 07-21-2013, 08:12 AM
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I've done this job, only because the mechanic at the time wouldn't take the 32 hours away from other customers to do it. It's a bitch. Recommend you do a general search in the forum for the same topic - I've seen a couple threads with a lot of good info and even some step by steps.

In short, the easiest way to get at the heater core is to take out the front seats, and everything (yes, everything) from the dash, except for the dash itself. The radio, the wood, the instrument cluster, glove box, speedo cable, etc etc.

If you're going to do the job, I'd recommend having an assistant who will take careful notes of what came from where and how it goes back. Some stuff will be obvious.

I recommend you inspect and replace as necessary the heater control levers. The parts are available from a couple vendors that are still in business. Also, if you're replacing the core, I'd consider replacing the blower motor as well (unless you can say with certainty that the thing is good).

In lieu of replacing the core with a new one, I'd recommend taking it to a radiator shop and having them repair the coils as necessary. A complete radiator rebuild will cost about $250, but a heater core would be much less, and thus more cost effective than buying a new replacement.

This job isn't "un-dooable," but it does take patience and time. It definately wasn't a weekend job for me
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post #3 of 7 (permalink) Old 07-21-2013, 09:12 AM
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Originally Posted by Pizing82 View Post
Hi guys, I need to repair, replace my heater core in my w109 300sel. Looks challenging and I'm looking for some advice of where to start, are there any shortcuts or tips from ppl who have done this before?
Is there anything else I should consider fixing or looking at doing at the same time of this repair?

The only thing to consider here is whether you can afford a good therapist or will you only consult with Mr Jasper A. Daniel.

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post #4 of 7 (permalink) Old 07-22-2013, 05:25 AM
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I swear, if/when I ever get to my 300's restoration, I'm going to pull the heater core out and put it in the enginy bay where it's easy to get to...
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post #5 of 7 (permalink) Old 07-22-2013, 06:06 AM Thread Starter
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Anyone ever fitted a ceramic core to fix the problem once and for all.


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post #6 of 7 (permalink) Old 07-22-2013, 08:50 AM
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if you dont want to evicerate the car , and just want heat , you could install a self contain heater unit at passenger side , and connect to 12 v and 2 heater hoses . it is about the size of a small electric heater for a room .
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post #7 of 7 (permalink) Old 07-23-2013, 11:21 AM
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if you dont want to evicerate the car , and just want heat , you could install a self contain heater unit at passenger side , and connect to 12 v and 2 heater hoses . it is about the size of a small electric heater for a room .
I presume our friend will only drive the car on nice days, so I'm almost thinking he can just crimp off the heater hoses and not have heat at all, and be none the worse for it.

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