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Originally Posted by thorsen
That makes sense. Mine had been converted to R-134 years before I purchased the car.
I guessed the compressor was on 100% of the time because I drove the car for 90 miles on the highway and got the inside nice and cool. I then had my wife slowly turn the temp dial to hot as I watched the compressor and the clutch never kicked off.
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The system had very poor efficiency at idle. The condenser is inadequate and the airflow across the condenser is inadequate. So, you can bet that the compressor will never get the evaporator down to a level where it shuts down the compressor.
Now, on the highway, it's a different story. Massive airflow across the condenser raises the efficiency of the system and will allow the evap to reach the cutoff temperature.
You can check this if you lift the hood and suspend your wife from the M/B hood ornament while travelling 60 mph.
