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post #1 of 11 Old 05-03-2012, 05:46 PM Thread Starter
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AC charge

Just added 3 12 oz can of r134a in my truck to the low side. Still only got the gauge, a professional liquid filled gauge, to maybe 28, air is way colder though. Should I add more? Outside temp is 80, pressure should be 45 according to chart... Any advice is appreciated. The air worked before but not the best...

2008 F250 XLT CCSB- 90k, 5R110W, b&w hide-a-ball, DIY coolant filter, final charge, dieselsite boots, xrt pro, CAI, SGII, egt gauge, DIY egr cooler blocked/bypassed, viper alarm/ remote start, P/S filter
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post #2 of 11 Old 05-03-2012, 06:06 PM
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Was it comPlety out before? At 45 psi your running a 40 degree evap coil, which is what your looking for. I like to charge mine with the motor turning about 2000rpm.

Last edited by Moto2four; 05-03-2012 at 06:09 PM.
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post #3 of 11 Old 05-03-2012, 06:24 PM
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First, what was the reason for putting 3 cans in the system?
It is sealed so it should never escape. If it does, it is leaking. If it is leaking then dont put more in till you fix the leak.

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post #4 of 11 Old 05-03-2012, 07:21 PM Thread Starter
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3 cans was needed to bring the pressure up to 25 at idle with ac set at max with Max fan. It was low before that. It worked but not the best. Now it's great, so I am assuming I'm good now that pressure is about 28 at idle?? I added one can and it was at 22, 2 cans, 24, 3 cans and it's now at 28psi at idle max ac...

2008 F250 XLT CCSB- 90k, 5R110W, b&w hide-a-ball, DIY coolant filter, final charge, dieselsite boots, xrt pro, CAI, SGII, egt gauge, DIY egr cooler blocked/bypassed, viper alarm/ remote start, P/S filter
06 VW Jetta TDI- all options, 100k, stock for now...catching up on maintenance...
04 Triumph Thruxton, cr special carbs, TPUSA cams, MAS side-covers, Lossa stubby exhaust, pingel petc*ck, etc...

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post #5 of 11 Old 05-03-2012, 07:25 PM Thread Starter
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The air in my truck has been the same since I bought it 3 years ago. Ok, not great, if it's a leak it's very slow...just FYI. Before I could always hear my compressor cycling as well. Now it's on all the time with max ac. So I think I was just pretty low and the low pressure switch kept cycling the clutch/compressor.

2008 F250 XLT CCSB- 90k, 5R110W, b&w hide-a-ball, DIY coolant filter, final charge, dieselsite boots, xrt pro, CAI, SGII, egt gauge, DIY egr cooler blocked/bypassed, viper alarm/ remote start, P/S filter
06 VW Jetta TDI- all options, 100k, stock for now...catching up on maintenance...
04 Triumph Thruxton, cr special carbs, TPUSA cams, MAS side-covers, Lossa stubby exhaust, pingel petc*ck, etc...

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Last edited by rt_hawk; 05-03-2012 at 07:33 PM.
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post #6 of 11 Old 05-04-2012, 06:42 AM
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Your right about the pressure switch cycling the compressor clutch like that.

28 psi seems real low to me. It has been awhile but i thought low side should be around 40 for the system to run and under that, the low switch would shut it off.?
idk about that though. If your clutch is running, then the pressure switches are satisfied.

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post #7 of 11 Old 05-04-2012, 06:48 AM
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If its at 28 psi at idle, it's prolly 20-25 going down the road. I thinks your still low.
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post #8 of 11 Old 05-04-2012, 08:56 AM Thread Starter
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Yea I don't know. I am worried that if I put any more in I'm going to blow a hose when it gets hot...air is way cold now. I did the ranger ac heat block off deal before and it helped but with the new 134a it's amazing now!...I don't have a high pressure gauge, I should probably get one to be safe. With 4 cans that's 2.75 lbs of r134a. What do the trucks hold? 2.2? The clutch stays on now...

2008 F250 XLT CCSB- 90k, 5R110W, b&w hide-a-ball, DIY coolant filter, final charge, dieselsite boots, xrt pro, CAI, SGII, egt gauge, DIY egr cooler blocked/bypassed, viper alarm/ remote start, P/S filter
06 VW Jetta TDI- all options, 100k, stock for now...catching up on maintenance...
04 Triumph Thruxton, cr special carbs, TPUSA cams, MAS side-covers, Lossa stubby exhaust, pingel petc*ck, etc...

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post #9 of 11 Old 05-04-2012, 09:12 AM Thread Starter
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Just checked my father in laws 99 SD. Max ac, fan on full, pressure was 28 at idle, clutch on, pressure started dropping, clutch would kick off under 25, pressure would build to 35, then clutch would kick in again. I guessing he is low... I also shimmed my ac clutch a while back to the correct air gap...that was a year ago.

2008 F250 XLT CCSB- 90k, 5R110W, b&w hide-a-ball, DIY coolant filter, final charge, dieselsite boots, xrt pro, CAI, SGII, egt gauge, DIY egr cooler blocked/bypassed, viper alarm/ remote start, P/S filter
06 VW Jetta TDI- all options, 100k, stock for now...catching up on maintenance...
04 Triumph Thruxton, cr special carbs, TPUSA cams, MAS side-covers, Lossa stubby exhaust, pingel petc*ck, etc...

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post #10 of 11 Old 05-04-2012, 09:43 AM
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What kind of symptoms were you guys having before this?

My AC blows good and cold for a few minutes and slowly dies away?

Is DIY recharging difficult?


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