Shade tree mechanic(s) wrestle with a faulty radiator coolant expansion tank: The reservoir was split which allowed weepage and seepage which eventually became leakage. None of these symptoms were visible from the engine compartment topside, except for the occasional adding of coolant. The sickening sweet smell from the slippery glycol mixture dripping from the underbelly was also noted. A new unit was ordered. The challenging bit was the removal of the original hoses and clamps. They were hard to access due to obscure placement and confined space. Luckily we prevailed with the uttering of only a few choice curse words and NO skinned knuckles. We took step by step photos detailing the procedure. Once the new piece was in place we followed the procedure to refill and bleed the system.