yangoub

Hi all
I need any DIY infos on changing the heating water circulation pump on my 2003 C230. It went to the dealership for the camshaft solenoids recall, a couple of days after I brought it back the leak was happenning. I can't pin point the origin of the leak. It seems as a case of loosely connected parts. Is this a hard DIY challenge?
I need the part number of the heating water circulation pump (M13). I have tried the number below and they don't seem to be good. Any help will be greatly appreciated. Thanx

yangoub


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Glyn M Ruck

Part number = A 203 835 00 64

yangoub

Any idea where to get it? Price? And any DIY infos?
Thanx

yangoub

Actually MB just told me that my part number is A 203 835 0164 based on my vin number and code. Still thanks a lot for the heads up. I still don't know if should do it myself. Any suggestions out there faulks I mean, someboby should have an idea. I have been at this for two days now. I feel kinda lonely out here, any input moderator Thanx a bunch.

Yangoub

pcy

Replacing the auxilary water pump shouldn't be that bad. When the engine is cool, remove the clamps on the hoses attached to the aux water pump, carefully remove the hoses, attach clamps to the hoses to stop the coolant leaking. Remove the aux pump, put the new pump in place, re-attach the hoses, tighten the clamps. Start the car and after warming up, check for leaks and check for coolant level.

Glyn M Ruck

Yes - 0164 is probably an improved 0064 - Benz do this all the time - sometimes just a new supplier - either will work. Try & get 0164 in case the part is improved. I'm looking at 2008 EPC

This is an easy DIY - I have never seen a method on the forum.

yangoub

Ok Guys thanx a lot I am getting READY for my first DIY!!!! Wish me luck.
yangoub

splinter

Received your PM. Have not yet replaced mine.
Eyeballed underhood tonight to have a look at that REST (residual engine heat utilization) pump.

Looks to be an easy and straightforward replacement. Trust you’ll interpret the following with a grain of salt, but here’s how I’d do it:

*Only work the cooling system when it is at ambient temperature (i.e., overnight cold) to avoid any possibility of nasty burns!


*Ensure your replacement pump visually identical.

*See to it that the key is off and out during replacement.

*Remove the reservoir’s cap anticlockwise.

*Gently disconnect the electrical connector. Depress and/or pry back the two hooked tabs while simultaneously pulling it free.

*Squeeze and slide back the three self-tensioning hose clamps from the adjoining barbed nipples.

*Have available a suitable container in which to catch the ensuing coolant/anti-freeze mixture. It’ll only be a liter or so, but it is reusable - assuming it’s in serviceable condition.

*Gently pry the pump away from the reservoir’s plastic mounting tabs. Be mindful that long term exposure to high temperatures can render them brittle.

*Twist, and then gingerly slide the hoses off the pump and reservoir.

*Installation is the reverse of disassembly. =)

*Replenish the fluid lost from the reservoir.

*Check for leaks upon initial installation and after several subsequent heating cycles.

*Top up the reservoir as required in order to achieve its proper level.


..kindly disregard if you’ve already tackled it.

yangoub

I have ordered the part from parts geek, they should be here later this week then I shall get to it. Thanx again for your assistance.

Cheers

yangoub

dboyrusky

Sorry to resurect this old thread, but i suspect my pump might be bad. Is there a way to test if its working or not? Thank you

C230 Sport Coup

Well 1st off you don't actually need it.
If you don't know how to test it, you've probably never used it and you could just bypass it.

There's a button, 1 left from the right side on your heating and control panel. When the engine is off (and even the key is out)
if you push this button, it will circulate the coolant via the pump in question to heat the car while you are parked with the engine hot. It serves no other purpose.

The nomenclature varies, but mine says AC / REST or is it EC (as in economy) / REST
which apparently in German means "Residual Engine Heat Utilization".
Later years, I think the button might read slightly different.

This button turns the AC off when the engine is running, as it is running ALL the time, unless depressed. It's on even when the heat is on to dry the air so as to not fog the windows. Slightly better mileage can be had by turning it off, hence they refer to it as "Economy Mode"
The switch in question is #6 in the attached diagram.

So to answer your question, to tell if it's working or not. Simply depress switch #6. You'll hear the pump turn on even from inside the car, ever so quietly. And heat will flow out of the vents, very slowly, no fan adjustments are available, and likely all your windows will fog up since with the engine off the AC is off and not drying the air, but your lady will be warm, while you run an errand in the store and she will marvel at this cool hidden feature of your Mercedes Benz!