mo'gas
Registered Member
What should the A/C pressures be on a 89 K5 Blazer R-12? What conditions? ie: engine speed, outside air temp, vent temp etc?
Thanks,
Dave
Thanks,
Dave
CK5
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A/C pressures
- Thread starter mo'gas
- Start date
shaun89
1/2 ton status
i think the normal pressure is around 2.5million psi
but really, dont the recharging kit come with the gauge that has the green range, and lets you know when its full?
but really, dont the recharging kit come with the gauge that has the green range, and lets you know when its full?
Do you have a set of refrigeration guages? If so the guages will have the R-12 temp scale to compare your temps to.
Example. Generally the center vent at idle will blow 32 degree air.
Do you actually have a source for R-12 if you need to top it off?
Example. Generally the center vent at idle will blow 32 degree air.
Do you actually have a source for R-12 if you need to top it off?
shaun89
1/2 ton status
no i dont have a set of gauges, but i worked at napa and saw them all the time, they come with most of the re charge kits. im 99% sure you can get R-12 at napa but its a lot more then the R-134a.
Jason4x4
1/2 ton status
you have to have an epa license to buy it.
Okay, Just my opinion here but if the system is not performing as you expect it should, Then I recommend that you retro fit it to operate on 134-A as it is available at all parts stores and even Walmart. No EPA license is necessary to purchase it either. If you are not familiar with refrigeration systems, then I think that for your safety and the reduced chance of "messing something up" you should let a shop help you.
The shop that does my AC work found a source of R-12 that is not too unreasonable. I would not have converted my truck if it had been available to them at that time. Every vehicle that I have been in that has had a low dollar type of conversion does not cool nearly as well on 134-A.
Agreed with the less effective cooling issue. Just thinking long term and availability as well as the lack of the EPA license or shop to access the R-12
mo'gas
Registered Member
Anyhow,
I have a gauge set.
I have more than enough R-12 to last me, my buddies and all our kids a long time.
I know that the general rule is high side pressure should be approximately the same as 2.5 times the ambient air temperature. I was just wondering if someone had their factory manual handy and could look up the specs for me.
Dave
I have a gauge set.
I have more than enough R-12 to last me, my buddies and all our kids a long time.
I know that the general rule is high side pressure should be approximately the same as 2.5 times the ambient air temperature. I was just wondering if someone had their factory manual handy and could look up the specs for me.
Dave
mo'gas
Registered Member
BTW,
You do not need a license to posess R-12 or to use it in a non commercial capacity.
It is only needed to purchase or commercially use it. I have a MACS license, but have been out of the industry for some time.
You need no license to purchase R-134 in a non commercial capacity either. However 134 is trickier to use than 12 and can easily get overcharged resulting in poor performance.
You do not need a license to posess R-12 or to use it in a non commercial capacity.
It is only needed to purchase or commercially use it. I have a MACS license, but have been out of the industry for some time.
You need no license to purchase R-134 in a non commercial capacity either. However 134 is trickier to use than 12 and can easily get overcharged resulting in poor performance.
