Question about 1978 Chevrolet C1500

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I have compressor oil leakage coming from the evaporator area but can't see where its coming from. What problem can I look for?It is on a 1972 chev truck. I have opened the evaporator cover but cannot see where the oil is coming from.

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If oil is coming form the evaporator box, the evaporator is leaking, period. Replace it, and the drier. Evacuate and recharge the proper amount.

Posted on May 31, 2010

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I need to know how to fix an ac on a 1991 Toyota corolla


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the best suggestion is to give up on replacing compressor clutches and have the system done by an accredited ac specialist shop
excessive pressure from excessive gas is hydraulicing the compressor and making the clutch slip burning it out
next flushing the system removes all of the compressor oil in the system leaving the compressor running virtually dry
next when a system is opened , moisture laden air gets in and that has to be vacuumed out for a period of 2 hours minimum or the water in the air turns to ice and blocks the tx valve
freon gas ( if that the gas that is supposed to be used as many now run r134a) is inserted ,not by the can but by the low pressure and high pressure readings on a manifold gauge designed for that purpose
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If you wanted you could dump the oil from the old accumulator into a cup and then add that same amount to the new one but an ounce would be the norm.

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I have a 1972 chevelle ss 454. I have ordered factory lines, compressor, condenser, and accumulator and poa expansion valve for r12. I will change oil, poa, 150. what else needs to be done with factory...


Use pag oil with a dye. Helps finding leaks. Think you have everything you need. Put the dryer on last and keep it sealed to prevent mositure from getting in. Pump it down for at least an hour on a new system.

Some compressors come with a full charge of oil. Use the right amount of oil. Add to compressor and add a little to the dryer as well.

need some good votes, thanks

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Oil fills each area (like compressor, receiver dryer, evaporator and condencer)then spills over to flow through the system...

This job requires special tools and training, take your system to a qualified shop, not the one that you have been going to.

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Ac compressor oil


First off is your compressor pre-lubed? to find out, remove shipping caps from ports and tip to side and see if any oil comes out. As a rule of thumb, The oil is sold in a small bottle pre measured for the entire system. 1/4 bottle per item (compressor, evaporator,condenser, and filter/dryer) The label showing cc's will do fine for your oil needs as the system will find its own level once activated. Oil continuously flows througout system. Need I remind you that when replacing compressor you should also replace filter/dryer so you do not repeat this job in two months.

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