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Replacing with R134

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Old May 29, 2009 | 10:11 AM
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LIGOOMBA's Avatar
LIGOOMBA
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From: Matthews NC
Replacing with R134

I have a 1992 F350 7.3with R12.The previous owner gave me all the parts to convert to R134 but the compressor and the lines are different.Can I replace the dryer/ Press switch and the little line filter(where does that go?).I also purchased the conversion caps at NAPA to fill the system.
My next question is can I replace all these parts and bring it to an A/C shop and have them charge the system.It has a leak, when I open the system will I have to replace the oil,meaning will it burn out the compressor when I open it up?As you can tell I know nothing about A/C.
Thanks any help will be appreciated
 
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Old May 29, 2009 | 12:00 PM
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Some of the stuff I looked up called for the filter on the low P side after the drier. On my expplorer, the filter is built into the high P line itself.

What all are you changing? Theoretically, you need the new barrier type hose for R134 and any metal parts (evap core and condensor mainly) would need a complete flush with AC flushing agent and drying out with compressed air. To be safe, change out everything for new parts. Especially if you have a leak and don't know where it is.

You can take it to a shop and have them evac and charge it. If there is any pressure left at all, it needs to be evac'd by a shop - you can't legally work with R12 without a license. But....when you get it all back together with new parts, you can go to autozone and borrow a vac pump and get your self some gauges and a few cans of R134 and charge it up yourself. Yes you need to add oil too. Do a web search and you'll find a chart for your truck of what type of oil and how much and about how much freon you'll need. You'll also find the evac/charge procedure. Once you do it, it is pretty simple.
 
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