Need some exploded diagrams...
 

Hi,

I need a source for some exploded parts diagrams. I have three GM vehicles, and I'm trying to handle some nit picky issues...

1984 K-5 Blazer...need to see how to remove replace the manual rear window crank. I have an extra tail gate I bought with a working unit, but need to see how to move it over.

1988 Scottsdale...need to dig into the heater core...would like a diagram showing location of all screws in the under dash ductwork so I don't break anything to get to it.

1993 C-6000 (actuall a GMC Topkick)...need to find where the brake light switch is supposed to be...can't find it. Any technical diagrams for this old U-Haul truck would be handy...366 tall deck, Allison 4 speed automatic...hydraulic over hydraulic power brakes...

Many thanks to anybody who can help locate this documentation.