Go to Payless Shoestore, try on 1,428 different pairs of shoes. Buy one pair. Put all the little packets of silica gel dessicant from all the shoes you tried on in with the pair you buy. When the clerk gives you the stink eye tell them you have awful sweaty feet. Install in your truck. Voila!

 

Try the Fog-X stuff for the inside instead of the Rain-X. Also, really clean the inside of the glass. I like to use a straight alcohol to strip the glass of oily residue then glass cleaner to clean the residue from the alcohol then buff it out very well.

When my A/C worked in my '85. I had to manually engage it with defrost to have it help dehumidify the air. Now that I no longer have it, I have to use heat only. The trick is selecting whether to use fresh or recirc. If the outside air is cold and dry, I use fresh, but if it is foggy, raining or snowing outside, I'll try recirc.

 

1. Open window.
2. Stick head out window.

 

You have that backwards. If it's foggy rainy or snowy you NEED fresh intake to circulate the moisture from your breath and body out. Otherwise you become one of those bozos you see driving around with moisture dripping down the insides of their windows.

It's really easy to remember. There is never a time for recirc except when you want the fastest possible cooldown in AC on a hot day. Cars that don't let you choose fresh/recirc work that way - only closed the outside air door on Max AC, all other positions are bringing in fresh air.

 

you can get GIANT silica things from a lot of old car parts places like roadster factory etc...we got a 25lb one for like $30 or something