I have a 93 toyota std MT pick-up truck. The air conditioner which had worked fine for 12 years it stopped cooling this spring. I had a can of the old type of refrigerant and charged it and it cooled fine for about a week. Then it stopped cooling. I had no more of the old type freon so I put the new type connector on the low pressure side, bled any remaining old type freon out then charged the system with the new
134a type freon, about 8 oz until it started cooling well. It worked well for about a month but now it only cools intermittantly.
Sometimes when I first start it in the morning the air coming out is not cool but later begins cooling. Other times it cools fine after start-up then stops cooling after say 10 or 20 mintes. Usually I can turn off the A/C switch for about 5-10 minutes then turn it back on and it begins to cool again. Or if I turn off the truck and park it then come back and start it back up it begins cooling again. When its not cooling I can see that the compressor is spinning. Also ther is pressure at the low pressure side.
Does anyone have any suggestions?