Reddit reviews URO Parts 11517527799 Water Pump, w/Metal Impeller

I ordered everything off amazon and did my thermostat, water pump, expansion tank, also on the automatic cars (like mine) there is another thermostat on the bottom of the expansion tank when you remove it, which most likely broke when your tank exploded

I also snapped off the drain screw/plug on the bottom of the expansion tank when switching it over...so I filled er' up with coolant, only to realize the MF'er was busted ever so slightly, so coolant was flowing through the expansion tank like taco bell does to me. So I replace that too for under $5.

This is a fairly easy job to DIY, the only thing you need to worry about is the 32MM wrench to take off the fan on the automatics, other than that, most of the tools are just the 14MM or 16MM sockets and some torx screws. If you are working on your E46 you should have a torx set, and a metric socket set. I did not do all the hoses though when I did mine as they felt and appear to be in decent condition.

[thermostat] (https://www.amazon.com/Stant-14602-Thermostat-Housing-Fahrenheit/dp/B000C822YM/ref=sr_1_1?s=automotive&ie=UTF8&qid=1487609776&vehicle=2003-31-176-20--1-6-6-7308-171-1-1---1-0&sr=1-1&ymm=2003%3Abmw%3A325xi)

[expansion tank thermostat that sits on bottom of expansion tank] (https://www.amazon.com/B7583-17111437362-Cooler-Thermostat-Housing/dp/B00BOIVI76/ref=pd_rhf_se_s_cp_7?_encoding=UTF8&pd_rd_i=B00BOIVI76&pd_rd_r=WV5225HSC9FA4W0BJ1FB&pd_rd_w=uAVgO&pd_rd_wg=nUSHN&psc=1&refRID=WV5225HSC9FA4W0BJ1FB)

[expansion tank] (https://www.amazon.com/Radiator-Coolant-Reservoir-Expansion-Quality/dp/B008564ZQG/ref=pd_bxgy_263_2?_encoding=UTF8&psc=1&refRID=9S8V0595SD0VV6X1BPVX)

[water pump with metal impeller] (https://www.amazon.com/URO-Parts-11-527-799/dp/B0066TLWGU/ref=pd_sim_263_21?_encoding=UTF8&psc=1&refRID=S1N6T6G260SVYS2YNMY1)

[32mm wrench for fan] (https://www.amazon.com/Clutch-Wrench-Water-Holder-Removal/dp/B017VLLQ6M/ref=pd_bxgy_263_3?_encoding=UTF8&psc=1&refRID=513EA9TG3QARCWSMJ554)

So for ~$150-$160 you can re-do the cooling system, if you want to do hoses as well, you are looking at another $50-$75