Another IC pump question ? - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 06-26-2019
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Another IC pump question ?

Hi everybody, this is my first post !!!

Ok, here we go ! This is what I did so far:

1- Check IAT with OBDII reader, when car cold, ambiant at 20C, IAT at 20C
and after 10 minutes, IAT at 24C, seems ok to me.

2- I know ECU disengage supercharged when IAT is above 93C and that's my
problem.

3- Took out the IC pump, disassemble, clean and reassemble it. Plug it to a 12V
power supply, inlet in the sink and pump was working fine !

4- Put it back on the car, hook the pump with the same power supply (not from the
car battery or with OEM harness), pump is working but something strange is
happening ????

5- My question is: when the pump is working that way, engine off, I should see
coolant coming out of one of the two metal pipe when I disconnect the rubber
hose that goes back to the coolant reservoir ??? No coolant comes out ???

And if my english is not that good it's because I'm a french speaking person from Canada !!

Hope someone can answer my question. Tnanks
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#2 Old 06-26-2019
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#3 Old 06-26-2019
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While it's not completely clear it sounds like the mechanical part of your pump has failed even though the electrical part is ok. If flow is below spec (or no flow) replace the pump.
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#4 Old 06-26-2019
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So I should see coolant coming out through the tube attached to the bleeding nipple ! If not the pump even if it's working is not strong enough, is that what your saying ??
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#5 Old 06-26-2019
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To test the pump use hose right after the pump.
Also note there are no pictures so I can't see what you are seeing.
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#6 Old 06-26-2019
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Ok i'm gonna take pictures later today, thanks
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#7 Old 06-26-2019
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#8 Old 06-26-2019
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In the first picture, when I energize the pump, nothing comes out of the tube and the second picture is my Bench Power supply made from a PC power supply very usefull !!
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#9 Old 06-26-2019
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That might no be the right hose to test, looks like the gas bypass for the engine.
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#10 Old 06-26-2019
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It goes to the coolant reservoir and the radiator !
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#11 Old 06-26-2019
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Yes that is not what you want.

You need to be on the IC circuit.
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#12 Old 06-26-2019
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SLK32_Air_Charge_System.gif

Ok, which hose do you want me to disconnect ?
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#13 Old 06-26-2019
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Ah nice diagram!
You want the section of blue hose before the intercooler.

If flow is ok then the red section after.

If flow is again ok supply pump with distilled water and disconnect after heat exchanger (you are testing for clogging).
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#14 Old 06-26-2019
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ok, which is more likely to clog, intercooler or heat exchanger ?
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#15 Old 06-26-2019
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Well when the coolant is neglected for too long both would deteriorate in a similar manner so about the same.
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#16 Old 06-26-2019
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I'm gonna make some more tests this weekend and keep you posted. Thanks again
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#17 Old 06-27-2019
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When I drive and car is hot, is the IC pump always on ??
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#18 Old 06-28-2019
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Final post, this is what I did:

1- Disconnect the hose that goes from the heat exchanger to inlet of the pump.
2- Connect a garden hose to the inlet of the pump into a bucket with coolant.
3- Start the pump manually with my Power supply.
4- Coolant was coming out of the heat exchanger, so no clog in the intercooler and heat exchanger.
5- Remove the garden hose and reconnect the hose from the heat exchanger to inlet of pump.
6- I let the pump run for 20 minutes to make sure no air was in the system, it's a self bleeding
system. I could hear the pump making a different sound when air was passing through !!

When for a drive and check IAT with OBD II reader and temp never got above 50C, I was not WOT
all the time but it's working now ! And for those of you who spent in excess of $100 to buy a new pump, it's just a 12V DC motor with brushes, very easy to rebuild yourself or go to a shop that repair small motor. Next time it happens, I'm gonna rebuild it myself !!! Thanks VII7 for your help !
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#19 Old 3 Weeks Ago
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Ok just to let you know I rebuilt my IC pump and this is the brushes I used, perfect fit :

Milwaukee carbon brushes, product no: 22-18-0710

And the bearing is from NSK 608Z, but I did not replace mine !!
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