AC help dripping evaporator!

well as the title states i have a dripping evaporator core that leaks water to the interior of the truck onto the floor and its a pretty heavy drip.

now i know you guys are going to tell me that its a clogged DRIP HOSE but its not clogged, it drips out onto floor outside with no problems and makes a good puddle but on top of that i am still getiing a drip inside and its cold not water from heater core.


question is, sometimes my AC doesnt feel full power early in morning and at night it works fine but midday shes kinda sucky but still cold, i just notice it leaking at all times but more during the mid-day hours. i was going to pull apart my passs side dash and see about re sealing box to keep waterfrom dripping but if its dripping out to floor outside why am i getting so much still dripping inside?
some people have told me cause its low on freon so the evaporator cold side is freezing over causing the excessive water drip? either way its getting to me and my riders toes lol.

any help would be great. truck has new compressor,lines,bottle. has been flushed and vaccumed. filled with guages and working within paramters compressor pumping good. 87' old freightliner classic converted to r134a.

 

my truck is an old 87 so no cabin filter here. as for the dirty evaporator or clogged fins or dusted up, you think this would make a big deal in terms of cooling and my stupid drip.

i cleaned one before while it was still on truck but it wasa t600 that had on the firewall in engine compartment. lets see if i can do it on my truck while its still mounted as its on my pass side interior of truck, but i hadnt come to think about it.

i had cleaned my last evaporator with acid whcih is made forthe fin of ac condensors and evaporator coils foams out the dirt and dust and you hose down imma have to cover my whole interior to do that with a hose.

 

i had cleaned my last evaporator with acid whcih is made forthe fin of ac condensors and evaporator coils foams out the dirt and dust and you hose down imma have to cover my whole interior to do that with a hose