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Old 07-06-2003, 08:13 PM
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Join Date: Feb 2002
Location: SF Bay Area, CA
Posts: 180
Magically teleporting coolant

I've done two coolant changes before on this vehicle, an '83 380SL, but I've never used the block drains. I would just cycle four or five rounds of clean distilled water through, draining the rad and expansion tank in between. Costly for the water, but cheap on time and hassle, and no need to raise the car.

This time, I had the entire system full of tap water after flushing, the car was on the ramps, and so I used both block drains. Drained rad and expansion tank too, let the thing drip dry, buttoned up, started to refill with 50/50 coolant/distilled from the expansion tank. Once the rad was full and the expansion tank was level, I said, "Ooops!" This time, because of having used the block drains, that's only half of the system filled.

I had started the car and let it idle briefly just as a test -- but I am leery of running it up to temp to get the thermostat open and allow the rad coolant into the block. Too much risk of damage.

In between pondering and reading the 107 service book to figure out what to do, I said, "Drat!" Remembered that I had not run the heater to drain the tap water from the core along with the rest of the system. I could just ignore it -- it's not that much tap water -- but I really prefer not to have any nondistilled water in the system, having cleaned out mineral crud for years from systems where people had filled with tap.

OK, simple enough. Turn on the heater, start and idle the car for 20 seconds, turn the engine off, pull one of the block drain plugs, expecting a trickle from the heater core leftovers.

Yikes! A cascade of what is without any doubt coolant-colored fluid comes pouring out. I frantically get the plug back in place to stop the flood. Thank goodness it's an Allen.

How in the world did *that* get into the block? The car hasn't run for anywhere nearly long enough to let the thermostat open to admit coolant from the rad.

Could the coolant be getting past the weep hole in the thermostat body? That's a prodigious amount of fluid to get past what I recall to be a tiny little hole, in only a few seconds of running time.

s/b
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Old 07-06-2003, 08:44 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Any time you drain coolant, you will have voids in the castings where coolant will stay. It is that simple. If you drain the block and the radiator, you will get at least 90% of the old stuff out. That is good enough.
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  #3  
Old 07-06-2003, 10:17 PM
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Join Date: Feb 2002
Location: SF Bay Area, CA
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Quote:
Originally posted by Benzmac
Any time you drain coolant, you will have voids in the castings where coolant will stay. It is that simple. If you drain the block and the radiator, you will get at least 90% of the old stuff out. That is good enough.
Roger that, Benzmac.

Any idea how to refill the block with coolant now that I have it all out? The 107 manual references a bleed screw on the thermostat (which I do not discern on the actual vehicle!), and also talks about jumping the aux coolant pump.

s/b

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