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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 06-04-2011, 09:43 AM
a228380 a228380 is offline
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Mein Auto: 1991 325i
ac pressure specs e30

does anyone have the low and high pressure specs for a 1991 325i e30 4 door factory ac system.

I had the system evacuated put in a new compressor and switched to r134a. On a very hot day the ac is luke warm. in the mornings before it gets hot the ac will be cool.

I have manifold gauges and i want to do some diagnosis but need to know what the low and high pressure should be.

thanks
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  #2  
Old 06-04-2011, 05:59 PM
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eieio4tn eieio4tn is offline
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not sure of the pressure at the moment, but the evap temp (on your suction gauge) needs to be around 40' (somewhere around 40-45 psig i believe). you should have sweat on your suction line up to the compressor, but NOT on the compressor itself. if i get a chance, i will get my gauges and get you an acurate #...
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Old 06-04-2011, 09:27 PM
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downhiller downhiller is offline
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the best way, since these are the r12 originally, then 134a numbers will be off. the best way to do a good check, wait till its low 90s out and add some 134a until it blows cold. what youll want is a thermometer to put in the vents and youll want somewhere around 40* comin out.
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Old 06-06-2011, 05:39 PM
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eieio4tn eieio4tn is offline
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with 134a gauges, 40' evap temp is 40'. there is no "off" to it. pressure/temp charts are a constant. 40' on r12 is 40', the pressure is different, thats the only difference.
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Old 06-06-2011, 08:17 PM
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downhiller downhiller is offline
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Quote:
Originally Posted by eieio4tn View Post
with 134a gauges, 40' evap temp is 40'. there is no "off" to it. pressure/temp charts are a constant. 40' on r12 is 40', the pressure is different, thats the only difference.
i was mainly talkin the air comin out of the vents.
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Old 06-07-2011, 05:57 PM
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eieio4tn eieio4tn is offline
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anyway...we both agree on the temp. to achieve a 45' supply air, the suction pressure would have to be @ 30 psig, which is 34'. head pressure should be in the 150-180 range.
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