| some closure on my AC system [message #138367] |
Wed, 10 August 2011 22:35  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma:
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Senior Member |
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I did some more testing today.
It was in the mid 70's so more normal pressures.
I knew the main evap was clean and I had the front off
I had my shiny and clean harbor freight A/C gauges hooked up
Engine running at 1500 RPM scaring women and small children.
I turned on the fans on the dash air and the secondary AC fan was OFF.
I added Duracool to get 20 PSI and the high side was 125-130.
Ran for about 10 minutes and it looked stable.
The evap was dripping and the low side was COLD.
I then turned on the secondary fan on high ( this thing has some serious airflow)
The discharge air on the secondary started out cold, but soon warmed up Hmmmm
The low side climbed to 25-28 and the high side dropped to 110-115
So it looks like the compressor can't keep up with both units running full blast.
Maybe at freeway speeds (2500RPM) it could, but not at 1500 rpm with no air flow through the radiator!
So I think with a large secondary evap, it's possible to overwhelm the compressor.
I still think the compressor is weak.
Now to get airflow through the dash vents...
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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