The a/c was working poorly, only a 20degree drop from ambient temps

Question:
I have a 2001 Dodge Caravan, 3.3Liter engine. The a/c was working poorly, only a 20degree drop from ambient temps. The lo side reads 25 psi, the high side reads 50psi., outside air temps in the nineties.The compressor does engage and runs all the time. The system is working partially as a steady drops of water come from the drain.The system runs on 134 and will not take any charging.Any suggestions would be appreciated. Already Tried: Replaced dryer, replaced compressor, evacuated and charged system

Answer;
From the pressures you describe it sounds like the charge is low. If it won't take a charge then you must have a restriction in the system. Most likely the condensor.

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Air Conditioning Blows Hot?

Any automotive air conditioning system employs four basic parts-a mechanical compressor, driven by the vehicle's engine; an expansion valve, which is a restriction the compressor pumps against; and two heat exchangers, the evaporator and the condenser. In addition, there is the refrigerant that flows through this system. If the system is low on the refrigerant ( R134a for automotive use) than the system will blow hot air. In most cases the vehicles system can be recharged. Check for leaks before recharging.

http://www.freeautoanswers.com/airconditioning.html

Test and Maintain your Car Battery

Batteries can be recharged because the chemical reactions they use are reversible; they are recharged by running a charging current through the battery, but in the opposite direction of the discharge current. Rechargeable batteries can be charged hundreds of times before wearing out; and even after wearing out some can be recycled.

Always keep your battery terminal ends clean and free of corrosion on the inside as well as out. You can use boiling water to remove the majority of the corrosion and then follow up with a wire brush. On some model cars equipped with anti- theft system it is important to have your security codes before you disconnect your battery or you may not be able to start your car. Another way is to attach a battery charger to the battery cables before disconnecting the battery to allow power to the vehicles computer during battery maintenance

started bogging and know I cant go over 5 miles an hour in first gear

Question:
I have a 2002 Nissan Sentra and i think I hit the converter when I bottomed out going up a bridge last week. Yesterday I was driving home and it started bogging and know I cant go over 5 miles an hour in first gear, and it is surging real bad.

Answer:
It is very possible when you bottomed out you created a restriction in the exhaust. From what you are describing, that is exactly what it sounds like. If you look under the car, can you see any damage such as bent exhaust pipes? The best way to verify a restriction in the exhaust system(if you don't have a vacuum gage) is to remove the exhaust bolts from the front pipe and drive the car- if it has power then you know the problem is in the exhaust.

Which oil should I use in my 95 Toyota Camry with 200k miles.

Just use the same regular oil that is recommended by the manufacturer.

They have high mileage oils, but most of these are synthetic blends...and synthetics are bad because they don't get contaminated. This lets the blowby gasses sit on top of the oil and when the oil is up in the engine, there is a fresh shot of raw gas sitting in the oil pan for the pump to pick up and try to lubricate the engine with...THAT is not a good situation to be in. This will usually destroy the oil pump before it hurts anything else, though. FYI, I have never had to change an oil pump on an engine that used regular oil..they have all been on engines that run synthetics.

Air conditioner has a moldy smell when used

The air conditioner evaporator drain hose is blocked or partially restricted, allowing condensation to build up around the evaporator and drainage tray. Clear the drain hose where it exits the passenger compartment

Troubleshooting your Air Conditioning System