2000 dodge ram pick up - ac blows hot air and freon is good

check for clutch slippage --and when charging system was it done at idle [which is incorrect ] or at raised rpms may be low on freon

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?

I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.

need to use manifold gauge set to check refrigerant level. level could be low or you have leak in the AC system.

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.

Freon is low. Its normal for the system to loose 10% freon a year. Due to the price of freon its bettery to make sure there is no large leaks before top off.

Check for a bad left door actuator motor.Have you checked the freon,to see if it is low?If the freon is not low,a servo,or actuator motor is not working.They are hard to find some times.If it is a vacuum problem,try this,remove the ac control out of dash,and remove the vacuum plug from vacuum switch.Spray some silicone spray in the switch,and the vacuum plug.Then reattach the plug,do this while the ac is on,and engine running,so the spray will be sucked into the vacuum switch,and servos.I have fixed a lot of them like that,but use nothing but silicone spray.Let me know the out come.

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

blend door closing to hot on heat side....vacuum line check valve failure or signal from ac/heater control unit wigging