One other dislike I had was the R4 ac compressor is/was horribly unreliable with r134a refrigerant which had been mandated by ‘95.
Cons: horribly unreliable
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This is what the dealership put in my 2019 that also has the newer refrigerant type. These AC compressor seem to be a common failure...too bad GM won't ever do a recall.
Cons: common failure, no recall
Vehicle:
Chevrolet Impala
Part number: 84441489
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