I just installed a new low pressure tube assy. and the accumulator / receiver dryer on my 92 3.0 shorty.
I didnt look close enough at the label on the blower case that tells the refrigerant capacity and I filled it to the spec. for having auxillary air which I do not have... (4 lbs with aux - 3 lbs without)
This is an R-12 system but I used Duracool in it which uses less gas... 6oz. Duracool = 19oz R-12 according to the can.
I put in 21 oz but should have only put in only 15 oz.
What are the risks or consequences here?
I have a guage, so I could monitor the pressure on the low side, but I dont know what the pressure "should" be.
Any ideas??

 

5. After a minimum charge is achieved, start the compressor and set system to medium fan. When the compressor cycles on and off about every 45 to 60 seconds stop the flow of refrigerant. Check the vent for cooling. If cooling is inadequate or compressor is cycling excessively add small amounts of DURACOOL 12a® by opening and closing valve handle. Low side pressures should read between 28 and 45 psi.

6. Do not overfill. Exercise patience and let the system operate for several minutes before adding refrigerant.

7. Apply refrigerant identification tag on dry area near installation port.

8. DO NOT OVERCHARGE! Exceeding 60 psi on low side may damage compressor. In some cases, clearing the site glass overcharges the unit. Any overcharging may cause loss of cooling efficiency.

When charging systems with DURACOOL 12a® the pressures will be the same for the low side as factory ( 28 - 45 PSI) and about 5-10% lower on the high side than CFC-12 and may be as much as 20 -30 % lower on the high side for
R-134a systems.

caution, this product is 100% propanes and methanes...in right air/fuel mix is like a gas bomb

 

You should never fill an AC system based upon capacity alone anyway. You should monitor the pressures with a manifold guage set. I'm surprised they don't have a pressure chart included with the product. I would suspect that the overcharge can destroy hoses and stuff from excessive pressures. I could not find a temperature/pressure chart for Duracool, but the low side pressure should not exceed 28-43 PSI during operation. If the system is overcharged, you will have poor cooling efficiency. I would remove the excess refrigerant as best you can, but do it slowly witht he system running, and monitor the temerature inside the vehicle to find that sweet spot where it works best.

 

Thanks for the fast replies.
I will use the guage on the fill hose to monitor pressure on the low side, if it's too high I will remove a little refrigerant at a time till it falls within spec.