For some time now, I've known that I'd need to replace my auxiliary water pump. When getting a flush and fill, they noted a couple of years ago that it was leaking. Also, I've noticed the last couple of winters the lack of heating capacity when at idle.

Fastforward to now.

I believe that I am detecting the smell of antifreeze from "inside" the car. Along with that, for some time, I believe I can hear water sloshing and/or gurgling in the dash area at a fast start/stop.

From these clues, who can tell me what is likely the culprit? I suppose what I'm really asking for is how the core and aux pump symptoms differ.

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1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
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1989 Mustang GT Cobra Convertible
43k miles