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When you get the lower temps are the engine revs higher? So when you are cruising on the highway your revs might be lower and thus the compressor is not turning as much as at lower speeds with a higher engine speed such as around town. I've noticed a similar problem with my wifes car where the temp seems to drop noticably at lower speeds/higher revs around town and then climb noticably at higher speeds/lower revs such as highway cruising.
- Peter.
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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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