T800 blower issues

I know with most T800's the blower motor is accessible from the engine side of the firewall. Whether or not you can blow out the cores from there I have no idea.

 

It will have a dual cage fan and the motor will run in reverse if the the wires are crossed

 

On mine there's the steel box and then plastic shielding over the steel. Most of my plastic is gone and it works fine. I was into mine a couple weeks ago troubleshooting, found the cores in there were filled up with mud, cleaned them out good and man will that truck burn you right out of the cab now!

Removal is 4, or 6 IIRC 10mm or 3/8 bolts, pull it off and unplug your blower motor and take it right off.

PSA when cleaning the heater and AC cores in this box, go slowly and resist the urge to really flush it out with a garden hose. The little drain hole can not keep up with the volume of water a garden hose will produce and you will wind up with a very, very, very wet cab. I'm lucky mine is a dump truck so the water dripping out of the hole in the floor for the hoist controls gave me a heads up pretty quickly.