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Antifreeze Odor

I have begun using the heater on some of the cooler evenings of the last
few days.  There is a fairly strong antifreeze odor.  The problem first
appeared last spring, but I forgot about it over the summer.  I'm guessing
that there is a leak in the heat exchanger, but I don't have much
experience with this part of the car.  I would appreciate any diagnostic
process help and any BTDT when replacing - special tools, time required,
etc.  Also, I still have the stock raditor.  I was told that later
generation replacements where improvements in the original's
design/performance.  I debating on the replacement of the later - comments
most welcome.  Thanks.

86 5KTQ 133k