Intructions for Replacing Aux Water Pump on 602 - Page 2 - PeachParts Mercedes-Benz Forum

dablk1 · #16 10-28-2010, 09:29 AM

Take a look at your replacement part, it probably has the 2 pin connector on the base opposite the 2 holes. The original one in your car probably has a 2 or e inch electrical wire attached to it. The actual connection will be the same. The connector is in a little holder furthest away from the firewall.

shertex · #17 10-28-2010, 10:05 AM

Funny how, in the FSM, they recommend either draining the coolant or relieving the pressure, depending on the model year. Of course mine's in a different location altogether, and nobody here seems to think draining the coolant is necessary....clamping at most.

dablk1 · #18 10-28-2010, 10:16 AM

If the engine is cold there shouldn't be any pressure to relieve, if there iss any pressure just simply remove the reservoir cap.

shertex · #19 10-30-2010, 08:18 PM

Making progress. Have washer reservoir removed and have disconnected electrical cable. Now I'm trying to dislodge old AWP from rubber holder...it's stuck REALLY tight after all these years. Any suggestions as to how best to get it free....without damaging the holder?

Thanks.

Billybob · #20 10-30-2010, 08:27 PM

Quote:

Originally Posted by shertex

Making progress. Have washer reservoir removed and have disconnected electrical cable. Now I'm trying to dislodge old AWP from rubber holder...it's stuck REALLY tight after all these years. Any suggestions as to how best to get it free....without damaging the holder?

Thanks.

It should be considerably easier to remove the two screws that hold the bracket in place and then fool with the motor and bracket once you get it on the bench, no? Sometimes especially up here in NE the outside body of the pump will rust under the rubber and it will be quite difficult to get things apart if you can't get some small thin tool in there between the rubber and the moter to break things up to loosen it.

If you're worried about loosing collant just look at the new pump's inlet and outlet and rustle up a couple things about the size to temporarily plug them up. If I recall correctly I've used the caps from magic markers to plug the heater hoses in the past, the kind that are tapered fit and worked great.

shertex · #21 10-30-2010, 08:33 PM

My next problem: I disconnected one of the hoses (the one on the side of the pump) and all sorts of coolant starts bubbling out of the pump. I was afraid I'd lose too much so I put the hose back on. I was told by several folks I'd lose about a cup of coolant if I didn't use hose clamps. Am I doing something wrong?

Engine is cold and I loosened cap on expansion tank.

shertex · #22 10-30-2010, 08:38 PM

Maybe I'm overestimating the amount of coolant that's getting lost....just makes me nervous. Will the flow stop?

Or will coolant keep flowing until I plug hoses with new pump?

Billybob · #23 10-30-2010, 08:44 PM

Quote:

Originally Posted by shertex

Maybe I'm overestimating the amount of coolant that's getting lost....just makes me nervous. Will the flow stop?

Eventually! Your going to lose the coolant that is in the hose above the pump but it really shouldnt be too much. Finding something to plug the hose temporarily is the easiest thing I imagine then the amount you'd have to worry about losing will be insignificant.

shertex · #24 10-30-2010, 09:00 PM

Quote:

Originally Posted by Billybob

It should be considerably easier to remove the two screws that hold the bracket in place and then fool with the motor and bracket once you get it on the bench, no? Sometimes especially up here in NE the outside body of the pump will rust under the rubber and it will be quite difficult to get things apart if you can't get some small thin tool in there between the rubber and the moter to break things up to loosen it.

One screw came out fine....the other, I turn and turn but still seems tight....maybe stripped....sigh.

shertex · #25 10-30-2010, 09:07 PM

I can't seem to get to second bracket screw to come out. But I NEED to do it that way because I can't really reach in far enough to disconnect the second hose clamp....I need to be able to move the pump to get room to turn the screwdriver. Grrrrrrrr...........

Billybob · #26 10-30-2010, 09:20 PM

Quote:

Originally Posted by shertex

I can't seem to get to second bracket screw to come out. But I NEED to do it that way because I can't really reach in far enough to disconnect the second hose clamp....I need to be able to move the pump to get room to turn the screwdriver. Grrrrrrrr...........

They are screws correct? With 8 or 10 mm hex heads? If so you might try to wedge something like a screwdriver behind the bracket some and apply a little pressure outwards while you turn the screw. That sometimes allows the threads of the screw to catch and then back out. I don't think it's a bolt with a nut on the back of it in that position.

shertex · #27 10-30-2010, 09:47 PM

Yes, 8mm screws.

I lost about 2 quarts of coolant. Does it surprise anyone that I lost so much? I should have played it safe and used hose clamps.

Well, maybe I'll tack another whack at it on Monday....or maybe I'll just give up and take it to be indie.

If I can just get that bracket removed I'll be fine....what you suggest makes sense. Thanks.

shertex · #28 10-31-2010, 06:54 AM

Quote:

Originally Posted by babymog

Significant? Just clamp both hoses and you'll lose a cup.

If you don't have the $5 hose clamps, use vice-grips and a couple of short pieces of wood.

What is the best tool to have to crimp the hoses? I saw on Harbor Freight site some grip pliers....seems like there should be something better suited.

shertex · #29 10-31-2010, 04:21 PM

SUCCESS! Was able to install the auxiliary water pump this afternoon.

Just in case it may help someone else, here's what I did:

1. Thought I would need some clamps but I didn't.

2. Loosened both hose clamps.

3. Left the protective cap on the outflow hole of the new pump.

4. Quickly removed inflow hose from old pump and attached to new pump...lost minimal amount of coolant and cap prevented any coolant flow.

5. Removed outflow hose from old pump and quickly removed cap and attached to new pump.

6. As old pump could not be removed from bracked while in car (too tight), I removed bracket and old pump in order to get pump out of bracket.

7. Put new pump in bracket and reattached bracket.

Now I've got blistering hot heat at idle....ready for another New England winter!

Thanks for all your help, guys....really do appreciate it!

dablk1 · #30 10-31-2010, 04:23 PM

Well done!