Mechanics

AIR CONDITIONING

1993 Ford F-150 • 190,000 miles

I haven't had AC since I bought the truck last year and as you know its very hot I live in south ga. So I had to convert it from r12 to r134a. I evacuated the system and pumped it down for about two hours. Under the hood it says that it requires 2 pounds and 12 ounces. Which is 44 ounces of course. I retrofitted the connecters and put 44 ounces in. The ambiant temp was 87 degrees. And according to my gauge it was at about 30 psi which according to the chart should be about 45 psi. So I go to AutoZone and explain my situation and the guy says to add another can. Which is 12 more ounces. So I did but when I hooked the gauge up at AutoZone it was at about 29 psi. So I added the can and the guy instructs me to buy another 14 ounce can of 134a with stop leak in it. So I did. Well as you already know that wasn't good. I ran it for a few min and the compressor started having short burst of Freon shooting out of a what to me seems like a pressure relief valve. So I cut it off and released a little bit of the Freon. That has quit now but what its doing is getting up to pressure and the compressor kicks on and immediately drops in pressure and it kicks off. Then slowly builds back up. Compressor comes back on drops pressure and cuts off again. Over and over. What do I do? Its already been costly and its very hot. Please help. Thanks
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Clintcoston
August 3, 2013.




When you convert from r12 to r134 you only put in.88 percent of r134 versus r12. Also you have to add pag oil to the system. You cant just keep adding charge like that sounds like your way over charged.

Saturntech9
Aug 3, 2013.
Pag oil? And I'm sure I have put way to much in. The refrigerant cans say that it has the necessary oils in it. Is there a way to know how much to let back out without evac the system and start over. That gets expensive. Thanks for responding btw : )

Tiny
Clintcoston
Aug 3, 2013.
Like maybe with the gauge hooked up and the truck running let off till it equals out?

Tiny
Clintcoston
Aug 3, 2013.
Unfornately it goes by charge weight not pressure on the gauges. Did you get a conversion kit that came with a can that had the oil and like 2ozs of ri134 in the can?

Saturntech9
Aug 3, 2013.
It came with three 11 ounce 10 oz. Of 134a and one ounce high mileage lubricant. Is what it says. Unfortunately the AutoZone guy got me to buy 2 more cans of straight 12oz r134 a and also a 14 ounce can of 11 oz of 134a. 2.5 oz of PAG oil and.5 oz of "cool down" to improve cooling up to 10 degrees. Plus O-ring conditioner to improve durability and stop leak to prevent refrigerant leakage. It says a red dye is included to mark leaks that may need to be manually repaired. That 14 oz can cost the most it was about thirty bucks. Cause I thought I needed it

Tiny
Clintcoston
Aug 4, 2013.
About four ounces of oil your about thereoil wise. Its too bad he over sold you on the charge and the products.A lot of those guys have never recharged a ac system let alone converted it from r12 to r134. Is the conversion kit made by inter dynamics?They usually come with a instruction DVD but sometimes its not in the kit. My brother Inlaw bought one of those kits ad didn't cone with the DVD.
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Saturntech9
Aug 4, 2013.
How do you know the correct position of the oriface in the actuator

Tiny
Clintcoston
Aug 4, 2013.
You mean the orifice tube in the ac line?

Saturntech9
Aug 4, 2013.

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