1965 Impala SS, windshield fogging after sitting months, coming through defroster vent. Why?
If my math is correct, your Impala is 55 years old. Your heater core is most likely leaking. If original, I am surprised it lasted this long.
Yes, very typical. I have replaced two on GM cars and the cost was a reasonable $150 or so. The last time the car was in GM dealer garage the guys were puzzled as to the cause of the fogging. Service writers are o low on mechanical knowledge.
I explained what is was and what it should cost. It came out $10 more than the last one.
It was also the last time I visited that dealer…