Success...FINALLY done with AC! - Chevy Impala SS Forum
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post #1 of 11 (permalink) Old 06-09-2016, 07:02 PM Thread Starter
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Success...FINALLY done with AC!

So, when 1st tried to charge my new to me '94 wagon, a hose was bad.

Replaced the hose(s), flushed condenser, replaced orifice tube, replaced receiver drier/accumulator.
Tried again, compressor failed (started making noise then locked up).

Replaced condenser, and compressor, tried again...brand new compressor had a defective clutch. Horribly noisy when disengaged/metal shavings coming from behind it.

3rd try today...replaced compressor with another new one. Recharged and WORKING! Love the 30lb tank, took just minutes to charge vs. those useless little cans.

39* out vent @ idle, and pressures look good. Have to keep an eye on it for leaks, etc., but will be nice to have working AC.



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post #2 of 11 (permalink) Old 06-16-2016, 05:28 PM
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Wow that's awesome bro! Must feel great with this warm summer coming.

Mine started short cycling after sitting for 3 weeks- so it's definitely got a leak in it. The cars getting a LO5 swap in it now with a tranny rebuild- along with recharging the A/C. He said the A/C system and hoses were fine, so he'll just replace the rings and refill the system.

'92 OCC 305/LO3 @ 243k
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post #3 of 11 (permalink) Old 06-16-2016, 06:00 PM Thread Starter
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You know it! They're forecasting 95* on Sunday and 99* on Monday😳
So just in time I guess.

If your hoses etc. are good be sure to replace the schrader valves in the low & high side fittings.
Very high probability of leak points especially the high side.
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post #4 of 11 (permalink) Old 06-18-2016, 01:45 PM Thread Starter
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86* outside right now 33% humidity...39* out the vent still today. I'm a happy camper!
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post #5 of 11 (permalink) Old 06-18-2016, 03:19 PM
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Congtrats, good job using the proper tools.

I LOVE the A/C system in my caprice. It's much better than my tahoe. I get right down between 30 & 32' out of the vents in the car.

I did have the chart for the outside temperature & humidity level how it corresponds to the high and low side pressures.

I can post it when I get home tonight as a reference.

Clear Image Tri-Ys & Hi-Flow cats >> 2.5" X-Pipe & Magnaflow Tri-Chambers, Mike Harris 4L60E, Circle-D 2,400 RPM TC, All MOOG FT End & Del-A-Lum bushed MOOG CTRL Arms, Eibach FT & New Stock HT rear springs. Hotchkis Sway Bars & End Links, RAISS, 3.73 Gears in Eaton carrier, Dynoshaft & CIA Loop, BMR Trailing Arms, Braided Brake Hoses, Taylor Spiro-Pro Wires, AutoMeter Water Temp & Oil PSI Gauges, Impala Console. ATE Blue Brake Fluid. Skip White distributor. 20's, Z28 Cluster, Corbeau GTS Seat
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post #6 of 11 (permalink) Old 06-18-2016, 03:36 PM Thread Starter
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Quote:
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Congtrats, good job using the proper tools.

I LOVE the A/C system in my caprice. It's much better than my tahoe. I get right down between 30 & 32' out of the vents in the car.

I did have the chart for the outside temperature & humidity level how it corresponds to the high and low side pressures.

I can post it when I get home tonight as a reference.
No real long trips yet, but guessing it'll go lower in temp. if they were. Pretty impressive for all the interior real estate in a wagon!
Very comfortable in short order. On the freeway for a few miles today it dropped lower than 39*, but I couldn't read the actual number on that little probe while driving.

I do have the chart, and used it when I was charging it. Pressures were good/right in spec. after charging the system.

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post #7 of 11 (permalink) Old 08-03-2016, 12:49 PM
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Congrats to you babywag...Can you give a few pointer on how you recharged your system up? I know I will need a Pump and I already have the HF Gauges but as for Freon..did you use the Cans or did you have bulk tank? As for the Oil, my AC Compressor from Amazon didnt come with specs on how much Oil it came with...is there a way to get all the oil out and re-add the correct amount? Im thinking not as the compressor will need oil to function but I could be wrong. Please advise your thoughts when you have a chance. Thanks!
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post #8 of 11 (permalink) Old 08-03-2016, 04:06 PM Thread Starter
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Generally you see how much oil is in your old compressor and add same amount to new one.
You simply hold new compressor over VERY clean cup, and slowly spin it to work/pump oil out hose openings. They ship with 6-8oz. depending on who it comes from.

When I did mine compressor got 4oz., receiver drier got 3.5oz., condenser got 1oz., hose assembly got 1oz.

Make sure to use correct oil PAG46 is what they came with.

I charged it the 3rd time using the 30lb tank.
2nd time used the small cans. Sure wish I would have checked the new compressor more closely before I installed it. Never assume a new part is good anymore...
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post #9 of 11 (permalink) Old 08-03-2016, 04:18 PM
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Quote:
Originally Posted by babywag View Post
Generally you see how much oil is in your old compressor and add same amount to new one.
You simply hold new compressor over VERY clean cup, and slowly spin it to work/pump oil out hose openings. They ship with 6-8oz. depending on who it comes from.

When I did mine compressor got 4oz., receiver drier got 3.5oz., condenser got 1oz., hose assembly got 1oz.

Make sure to use correct oil PAG46 is what they came with.
When I did mine, I thought I used PAG150, but I'd have to look at receipts. Regardless of that, what I'd suggest, as I did was to install the new oil into the suction port, and slowly turn the pump's pulley to get it into the pump. Just be careful, as it work its way thru, and start to come out the pressure side.

Quote:
Originally Posted by babywag View Post
I charged it the 3rd time using the 30lb tank.
2nd time used the small cans. Sure wish I would have checked the new compressor more closely before I installed it. Never assume a new part is good anymore...
If memory serves me correctly, the system take 1Lb 7 ounces (23 Ounces), so it just about takes two of the 12Oz cans you find on the shelves at any store these days.

1. Did you install a new Orifice Tube?
2. Did you install new O-Rings?

After you complete the system install, what I did was draw a vacuum down to 30" of mercury for a few hours (As drawing a vacuum removes any moisture in the system) unplug the pump, and walk away. Go have a beer, or two, or..whatever.

Let the system sit for about an hour, and ensure that you are still holding 30" of vacuum. This is a verification that your system is fully closed.

Clear Image Tri-Ys & Hi-Flow cats >> 2.5" X-Pipe & Magnaflow Tri-Chambers, Mike Harris 4L60E, Circle-D 2,400 RPM TC, All MOOG FT End & Del-A-Lum bushed MOOG CTRL Arms, Eibach FT & New Stock HT rear springs. Hotchkis Sway Bars & End Links, RAISS, 3.73 Gears in Eaton carrier, Dynoshaft & CIA Loop, BMR Trailing Arms, Braided Brake Hoses, Taylor Spiro-Pro Wires, AutoMeter Water Temp & Oil PSI Gauges, Impala Console. ATE Blue Brake Fluid. Skip White distributor. 20's, Z28 Cluster, Corbeau GTS Seat
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post #10 of 11 (permalink) Old 08-04-2016, 05:52 PM Thread Starter
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2 cans is not enough they take 28oz.
You also need to add 2oz. to compensate for the manifold & hose assembly.
So to get a full charge you want 30oz., using just 2 cans will result in a low charge. It will still work, but won't be optimal.
If you're not replacing everything or flushing the whole system use pag46.
If you flush everything you can safely switch to pag150.
I would not ever mix oils.
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