My 1986 190E had a nice gurgling sound as well. Then one day the heater core exploded and dropped hot ass antifreeze all over my feet from out of the drivers side floor vent. No fun when driving 45-50 MPH on a three lane wide road! Burned the crap out of both feet and ankles as I attempted to cross three lanes, brake, and not blow the engine due to overheating. The heater core took me about 5 hours to replace, but I was also checking vacuum lines and wiring in the dash since I had it all out anyhow. Not really a bad job but you do need to remove the whole dash to get it. As for that aux pump, mine is dead and the heat is fine at idle. I am going to just take it out when I do my next flush and fill in the spring and put a piece of pipe in there to connect the two hoses. It is not worth the money to replace it unless you want the factory appearance and stuff under the hood.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....