Re: which radiator for sb ac auto car
Twenty-three inch radiator is for A/C equipped cars. As said, several flushings may have loosen trash/sediment and plugged the core.
Original equipped AC cars usually have a larger crankshaft pulley to overdrive the water pump. Since you have Vintage, aftermarket AC, not a problem, and a Plain Jane, the pulleys may be of the same diameter and w/pump turning at the same speed. You can get a larger c/shaft pulley from one of the vendors here. You also might look into getting either a clutch fan set-up, again original AC option included in the AC option, or a flex fan as the mechanical four-blade fan may be hindering air flow through the radiator at highway speeds.
Installing a high flow thermostat may help also.
a strip of foam across the top of the radiator support to seal the hood from the front of the radiator would help, prevents recycling of hot air through the radiator.
Ensure rad cap is good, 210°F is not bad, as long as it doesn't boilover.
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