only cold air at low speeds not hiway speeds

Joined
Mar 24, 2010
Messages
706
Location
Chicago Suburbs
Questions while out on the road in the big rig ,, my 2000 Buick Regal last week end only blew cold air at low speeds in town out on the county roads my cooling diminished quickly

I popped my gauge set and at 90 degrees ambient I was right around 50 psi on the low side and I think 175 200 high side ,, compressor was noisy also , could it be low on oil , i have to put about 10 oz of r134 in every other year , and the car is stored in the winter ,,, so i have been looking through the forums
 
Compressor is either low of refrigerant or the compressor is starting to fail.
 
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