I can't figure out why my AC doesn't work. I did everything by the book.
Flushed whole system.
Pulled a vacuum for 3 hours.
Held vacuum for 1/2 hour
Added correct oil and charged with R-12
Brand new filter/dryer

High side around 150 low side around 25. No joy but I have a good temperature drop through the condenser coil. I can't remember the exact numbers but it was like a 40 degree temp drop. When I rev the engine the low side drops to like 10 or 15.

Added more R-12. High side around 200 low side around 35-40. Still no Joy, When i rev the engine the low side drops again to around 20 or so. Is the drop of pressure like that normal??

The expansion valve is ice cold and I can hear it working. I did find the outside air damper was always open. I disconnected tha actuators and jammed it shut. But it didn't help.

I just don't understand it. It's almost like the air is completely going around the cooling coil. Is that possible?

Testing was done with ambient air at 90 or so. Revving the engine at 2000 rpm doesn't help either. There are bubbles in the sight glass but I can see refrigerant flowing. I should get SOME cooling.

What do I need to do to get cold air??

Thanks

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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