I just went thru this exercise. Started with flush and refill, new cap and t-stat. Ended up fixing it with a new radiator. My symptoms were the same as yours, started slowly and ended up just overheating in b to b traffic. Just went with the original 3 row rad and the problem went away. Like they say start with the cheap items and work your way up. Hope yours gos away before you get to the rad replacement. LOL
1980 ZX Overheat
I have recently noticed my 80ZX having an overheat problem, first indications of this problem was the temperature started creeping to between half way and 270f during stop and go traffic. Lately I've notice a knock, (like low octane gas) noise when I get down on the accelerator, and just yesterday the temp shot up to 270f in stop and go traffic. It does go lower when air starts getting through it at speed. Looking for places to start trouble shooting myself before I spend big bucks taking it in!! Anyone got any easy fixes????
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