I have a 1994 Blazer with the 5.7L motor. Would anyone know the size of the big bolt that is on the radiator fan?

 

if you dont get your answer they sell entire fan clutch kits that pretty much comes with all the stuff you need, or can usually rent one from autozone.

if your lucky you might be able to get in there with a large pipe wrench or crescent wrench to get that nut off

 

Thanks abig84. I actually pulled the water pump today and to my surprise, there was no big bolt in the middle of the radiator fan. Instead, I just had to take the 4 smaller bolts off and the fan/clutch and pulley cover just slipped off. When looking at a y_tube vid, it showed the big nut, but my 94 did not have that setup.