Last night I converted my 91 Loyale from R12 to R134.

 

 

Put in 3 bottles of R134....it got colder, but it's not COLD. Do you think I just need more bottles of R134, or what?

if u overcharge an a/c system, it will not work as well, ur suppose to use less R134 than you would have used R12 when converting

did you use a vacuum pump when you did the conversion?

 

r134 does have a higher vent temp.. it's just not as good a refrigerant as r12..

did you use a vacuum pump when you did the conversion?

 

r134 does have a higher vent temp.. it's just not as good a refrigerant as r12..

 

Yeah, I've never liked the r134a systems, they just aren't as efficent coolers as the old stuff.

At idle its sort of lacking...

 

 

nipper

Make sure that the coil thingamabob-doohickey that hangs in front of the A/C compressor is mounted straight and even to the motion of the clutch... and that it is not too far from the face of it, and that it is plugged in. My AC was VERY lame-duck until I tweaked mine, and then it actually worked.

 

It is still pretty lame-duck, but I think there was something wrong keeping me from fully charging it. That is one problem that I simply let my brother (ASE certified) fix for me, and when he said "thats about all your gonna get" I just smiled and nodded. He said something, about something, that would overpressurize and cut the compressor off, IF we added the full amount of refrigerant.. (can you tell I wasn't entirely clear in my understanding of this subject, and still am not? )

R134a operates efficiently at higher pressures than R12. The high pressure switch may be affected in this case. Don't know if there are other switches that will easily solve this problem. Also, it needs a larger condensor to be as effective.

 

When converting, the amount of R134a should be 80% of what the R12 charge should have been. Typically, R134a should be charged using a scale or some other method of measuring the amount that goes in, because it's more sensitive to overcharging than other refrigerants.

 

If you have a marked drop in cooling at idle, your compressor probably has some wear. But this is somewhat normal anyway, because the compressor isn't turning as fast, and there isn't as much airflow across the condensor.

 

Solution: Drive fast. Or fit the largest condensor you can find.

134A systems use a MUCH larger condenser than the older R12 Systems. That's why new 134A systems run as cold as the previous R12 systems. Replace with the LARGEST condenser you can fit and or use high cfm fans.

 

Todd