I think i over charged my ac unit 80 lowside 251 high side.big coper pipe is cold, small coper pipe is not hot. just wondering if that would have an affect on quality of air

look for a port on the aluminum ac pipes on the driver's side of the engine compartment next to the suspension tower. Port might be on the underside of one of the pipes, marked with L.
Usually on modern cars the ports are pretty fail safe...you can't hook up to the high side with a standard DIY R134A recharger/kit.
Google this:
2007 dodge charger ac recharge connection

It could be going out on a high head pressure safety

The easiest way to tell on any car is that the low pressure hose is always larger than the high pressure one, and you always want the low pressure hose.
You can also tell because it is the one going from the radiator condenser/receiver/dryer, to the interior of the car. It is never the one attached to the pump.

use a proper AC machine and remove the gas so its weighed on removal and i do think you will find that its undercharged with gas ,most vehicles operate with around 750 grms of gas by weight and i think yours will show about 150 grms of gas so it works but it doesnt get cold enough ,the low pressure pipe out of the valve under the bonnet should be well cold with condensation on it and the inlet pipe which is thinner should be warm to hot ,unless you have operating flap thats not closing properly that is ,but i would stick the machine on it and weigh the gas to make sure before you pull the dash apart

NO. Use your hand and find out where its cold/ hot. Small pipes are high pressure (hot) large pipes are low pressure (cold) The big can in front of the passenger should be cold. If not, it could be low on charge. The rear uses an expansion valve, so its really different than the front (orifice tube)

Make sure the outside fan is running. Also check the high side pressure, I assume the 70# is the low side pressure, so you can tell what the compressor is doing. If the fan and compressor are both working, make sure there is good airflow through outdoor coil and check that it is clean. Let me know what you find.

you could have over charged the system ?? or the operating flaps in the heater unit are not working ,find the inlet and outlet pipes for the AC where they enter the vehicle and see if one pipe is hot and the other cold ?? the big pipe should be cold and the thinner one hot

If this is a heat pump it sounds like the reversing valve is stuck in the heat mode, replacing it requires opening the sealed system, which needs to be done by a licensed ac repairman.

If your talking about the low side sevice port to charge your ac, its easy to find. With your recharge kit, it comes with a nozzle to attach to this lowside port. Each port, (lowside and highside), are different diameters. The charging nozzle will ONLY fit onto the lowside port. Just run the length of your ac lines from the compressor and trace them back to the firewall. You should find both ports before you hit the firewall.

If the big pipe out side is cold and sweating and the little one is warm to touch if it is hot to touch under charged. I would suspect insulation, or under sized unit
is their a 20f difference from supply air to return air the i would lean towards insulation. Tom