I have a 2001 dodge ram 1500 my ac is blowing hot instead of cool

u sound like your describing an AC system w a blockage in it. Is the compressor going on & shutting off ? Any air at all blowing? Hot/cold/cool air?

you say it will blow cold and hot air for only a few minutes. You don't say but I assume you mean will blow cold a few min. when turned on AC max , blow hot only a few min. when turned to heater hot. Assuming thats the situation and you say AC charged and shows good on the low side -you should charge the AC to a full charge on the low side will cause problems with the AC air compressor kicking on and off. I suggest while the engine is running and turned to AC cold max watch the AC air compressor clutch to see if it does indeed kick on and off if so charge completely. As far as the heater make certain you coolant is all the way to the top and the best way to do this is when engine is completely cold remove radiator cap and fill completely and completely close cap then fill overflow container just to the cold level. That should fix your problem.

It sounds like a low charge. It could be a clogged expansion device also. It has a higher probability of being a low or contaminated charge.

if the compressor is turning on and and off R1-34 level is low recharge system.

recharge your system, it;s low on refrigerat, there is not enough liquid going into the evap to help maintain cooling, hence the speed of the compressor. install gauges to check pressures at idle, if not to spec , recharge. if it's low you have a leak to repair. also make sure your AC condenser is clear. GOOD LUCK. RDJRP

If AC under hood gets cold then it could be the damper motor or the shaft it drives has split a common problem.

Check the evaporator coil by sniffing the vents,floor is best, with your tester.

sounds like u guessed right blender door is getting stuck motor is weak or mount is cracked

Your A/C sounds like it needs to be vacuumed
out and then recharged to factory specs. That
should solve the problem.

Have you checked the cowl to see that it is free and clear of leaves and dirt? You may have to take the plastic off to get down into it and sweep it out with a vac. Usually it is right under your wipers.