R12 AC Recharge kit
#1
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R12 AC Recharge kit
Found this on ebay, comes with the pressure gauge so you dont overfill, my 87's AC doesnt blow cold
http://cgi.ebay.com/ebaymotors/R-12-...Q5fAccessories
I had read about people having success with just replacing the R12 caps with the R134a caps and filling the older system with r134a.
This is a knock-off R12 similar to Freeze-12
I am going to try this first rather than do the cap conversion.
Anyone use on of these before?
http://cgi.ebay.com/ebaymotors/R-12-...Q5fAccessories
I had read about people having success with just replacing the R12 caps with the R134a caps and filling the older system with r134a.
This is a knock-off R12 similar to Freeze-12
I am going to try this first rather than do the cap conversion.
Anyone use on of these before?
#5
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James
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Because for $60 bucks at napa you can get a retrofit kit for these trucks that includes all new seals, nozels, and the ester oil, and be paying around $7 for 2 cans of r134a! (price for r134a guesstimated, haven't bought any for a while)
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#9
I feel for ya.My r12 setup blows 38 to 40 at the vent.I have actually fogged the outside of the windows because its so cold.With the price of r12 nowadays,I can see no reason to convert.I have put 36oz of r12 in my truck in the 18 years I have owned it.If r12 skyrockets in price maybe I would consider it,but not now.
#11
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Im pretty sure my system is drained, what maintenance should be done before refilling with the system? I tried searching A/C compressor seal replacement but could not find anything?
#12
you should do a leak test and evac for at least 30 min before recharge.prefererably 45 min.gets all the moisture out.if system is airtight fill her up.make sure you cycle your fan clutch on when you recharge.keeps expansion valve from freezing up
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Based on what?
If you're using a pressure gauge to estimate fill, you need the pressure AND TEMPERATURE on both high and low sides. One pressure reading tells you next-to-nothing.
This might give you some leads: https://www.yotatech.com/forums/f116...-r134a-284801/
If you're using a pressure gauge to estimate fill, you need the pressure AND TEMPERATURE on both high and low sides. One pressure reading tells you next-to-nothing.
This might give you some leads: https://www.yotatech.com/forums/f116...-r134a-284801/
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Found this on ebay, comes with the pressure gauge so you dont overfill, my 87's AC doesnt blow cold
http://cgi.ebay.com/ebaymotors/R-12-...Q5fAccessories
I had read about people having success with just replacing the R12 caps with the R134a caps and filling the older system with r134a.
This is a knock-off R12 similar to Freeze-12
I am going to try this first rather than do the cap conversion.
Anyone use on of these before?
http://cgi.ebay.com/ebaymotors/R-12-...Q5fAccessories
I had read about people having success with just replacing the R12 caps with the R134a caps and filling the older system with r134a.
This is a knock-off R12 similar to Freeze-12
I am going to try this first rather than do the cap conversion.
Anyone use on of these before?
I feel for ya.My r12 setup blows 38 to 40 at the vent.I have actually fogged the outside of the windows because its so cold.With the price of r12 nowadays,I can see no reason to convert.I have put 36oz of r12 in my truck in the 18 years I have owned it.If r12 skyrockets in price maybe I would consider it,but not now.
Last edited by Janos01; 05-20-2015 at 08:37 AM.
#16
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The R12 system should read 21-28psi on the low side, and 206-213psi on the high side. This is with the engine at 2000rpm. Ambient air temperature may slightly vary the pressure indications, but this is the ballpark pressure readings.
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According to this PT chart http://www.foxmacon.com/Tecumseh/Tem...re%20Chart.PDF,
R12 at 206psi corresponds to a temperature of 140°F. Are you measuring the pressure BEFORE the condensor?
A suction-side pressure of 28psi corresponds to a temperature of 30°F AFTER the evaporator, which means that very little "cold" is being released to the cabin. (The refrigerant only gets warmer in the evaporator; if the temperature inside the evaporator is below 32° at any point the evaporator should be one big block of ice. Except (maybe) in the Sahara.)
I'm by no means an expert in refrigeration, but those numbers are hard for me to follow.
Last edited by scope103; 05-20-2015 at 09:38 AM.
#18
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Rustypigeon: do you have a reference for that?
According to this PT chart http://www.foxmacon.com/Tecumseh/Tem...re%20Chart.PDF,
R12 at 206psi corresponds to a temperature of 140°F. Are you measuring the pressure BEFORE the condensor?
According to this PT chart http://www.foxmacon.com/Tecumseh/Tem...re%20Chart.PDF,
R12 at 206psi corresponds to a temperature of 140°F. Are you measuring the pressure BEFORE the condensor?
http://personal.utulsa.edu/~nathan-b.../8inspecti.pdf
These are the expected pressures at the service valves with the compressor running.
The chart you are referencing seems to be static pressure values with the compressor not running. The values on your chart are what you would typically see on both high and low side with the engine shut off. For example a typical 134a system will have a system pressure of 72-114psi when the engine is shut off. This corresponds to an ambient temperature of 70F-95F on the chart you linked.
You can't use the static pressure of a refrigerant to determine if the system has an adequate amount of refrigerant, it will only tell you that some liquid refrigerant is present in the system. For example at 80F R12 has a static pressure of 84psi. If you hook up your manifold gauge and get a reading of 84psi with an ambient temperature of 80F, you have some liquid refrigerant in the system. It could be only 1 ounce, or it could be filled to spec. There is no way to tell with a static reading. If however you get 50psi static with that same 80F ambient temperature, you know the system is low because no liquid refrigerant exists in the system at 50psi with R12 at 80F.
Last edited by rustypigeon; 05-20-2015 at 03:31 PM. Reason: added page number
#19
R12 filled to capacity.
Whats the subcooling need to be? Filled to 165 hi side, 32 low. Liquid line temp 95. I now know u dont want more than 220 psi hi side. So whats good high side pressure at 80 degree ambient? It may be 110 outside in august.
#20
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If you are getting 32/165 with the above conditions, your compressor is worn.
Last edited by rustypigeon; 05-20-2015 at 11:39 AM. Reason: added information