How much refrigerant to charge AC?

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Gray035
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How much refrigerant to charge AC?

Post by Gray035 »

I've completed an install of a new (to me) AC system on my truck, but I don't know how much refrigerant is supposed to go into the system. And since its a system I put together, there's no manual or anything to look at. Everything is new, and I'm using a Sanden style compressor.

So can anyone tell me how much refrigerant I should expect to use? Should I go by trial and error using vent temp?

Need help!!
1968 F-250 Camper Special
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sargentrs
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Re: How much refrigerant to charge AC?

Post by sargentrs »

Around 28 oz I think. At least that's what Google says. :doh:
Randy
1970 F100 Sport Custom Limited LWB, 302cid, 3 on the tree. NO A/C, NO P/S, NO P/B. Currently in 1000 pcs while rebuilding. Project thread: http://www.fordification.com/forum/view ... 22&t=59995 Plan: 351w, C4, LSD, pwr front disc, p/s, a/c, bucket seats, new interior and paint.
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1972hiboy
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Re: How much refrigerant to charge AC?

Post by 1972hiboy »

which a/c system are you using? new aftermarket or an old system?
Rich
1973 f350 super c/s 460/c6 22k orig miles
1972 f350 srw crewcab special 390
1972 f250 4x4 sport custom 390fe Red
1972 f250 4x4 custom 360 FE " Ranger Ric"
1972 f250 4x4 custom 84k og miles 390
1971 f250 4x4 sport custom 56k og miles. 360
1970 f250 4x4 428 fe hp60 205 d60
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mkoecher
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Re: How much refrigerant to charge AC?

Post by mkoecher »

I have a '76 that I converted to R134a. I put around 1.8 lbs in. It works well. I would maybe try for 2 lbs if I were to do it again though.
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Gray035
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Re: How much refrigerant to charge AC?

Post by Gray035 »

The system has a new 508 syle Sanden compressor coupled with an old dealer add on evaporator unit. The condenser is a universal aftermarket one.
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1972hiboy
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Re: How much refrigerant to charge AC?

Post by 1972hiboy »

I would expect somewhere in the 1.5lb to 2 range. Do you have manifold gauges? what freon are you planning on running?
Rich
1973 f350 super c/s 460/c6 22k orig miles
1972 f350 srw crewcab special 390
1972 f250 4x4 sport custom 390fe Red
1972 f250 4x4 custom 360 FE " Ranger Ric"
1972 f250 4x4 custom 84k og miles 390
1971 f250 4x4 sport custom 56k og miles. 360
1970 f250 4x4 428 fe hp60 205 d60
Dont eat yellow snow.....
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Gray035
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Re: How much refrigerant to charge AC?

Post by Gray035 »

It's a dealer add on unit, but with a new Sanden compressor and new everything else. I put in about 26 oz and it's pretty cool coming out of the evaporator, but I think that I might add a little more.
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Gray035
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Re: How much refrigerant to charge AC?

Post by Gray035 »

Oh, and I'm using 134A.
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