Does your AC do this ?
05-14-2003, 03:28 PM
#1
Three Wheelin'
Thread Starter
Does your AC do this ?
I noticed that when my AC compressor comes on that the idle speed did not seem to compensate for it enough and it also has a bit of a rumble sound to it. The idle speed I figured was probably related to an issue with the idle stabilizer system, the rumble I figured was a bearing going out on the AC compressor clutch.
I drove another 951 that had pretty similar AC rumble and less than ideal idle with the compressor engaged, so I am wondering how common this is?
One story that I heard was that a 944 compressor with R-134 gas instead of Freon presents more of a load than the idle compensation system was designed to cope with, can anyone confirm this ?
Oz
I drove another 951 that had pretty similar AC rumble and less than ideal idle with the compressor engaged, so I am wondering how common this is?
One story that I heard was that a 944 compressor with R-134 gas instead of Freon presents more of a load than the idle compensation system was designed to cope with, can anyone confirm this ?
Oz
05-17-2003, 10:53 PM
#3
Racer
Join Date: Mar 2003
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If R-134a is charged to the same level as R-12 (aka Freon), then yes, the system will be severely over-taxed. R-134a needs to only be charged to about 75% or R-12 levels, and even then it will have higher head pressures and lower vent temperatures than R-12.
R-134a, to accomplish the same cooling, requires a larger compressor and a larger condensor.
Aaron
R-134a, to accomplish the same cooling, requires a larger compressor and a larger condensor.
Aaron
05-17-2003, 11:27 PM
#4
Burning Brakes
Join Date: Jan 2003
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Mine is converted to 134a and makes no odd or different sounds, or difference in idle. Works perfect and freezes your a$$ off. BTW you charge 134a to 80% of R12 oz's.
05-18-2003, 01:31 AM
#5
One story that I heard was that a 944 compressor with R-134 gas instead of Freon presents more of a load than the idle compensation system was designed to cope with, can anyone confirm this ?
The amount of high side pressure vs. low side pressure is directly related to the amount of Freon in the system..R12, R134A or anything else. So, if you add too much Freon, your high side pressure increases and your system leaks or has a compressor failure. You really need gauges to charge a system.
The amount of high side pressure vs. low side pressure is directly related to the amount of Freon in the system..R12, R134A or anything else. So, if you add too much Freon, your high side pressure increases and your system leaks or has a compressor failure. You really need gauges to charge a system.
