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Old 03-21-2021, 07:11 AM
JeepsAndGuns's Avatar
JeepsAndGuns JeepsAndGuns is offline
AMC 4 OH! 1
Join Date: Jul 18, 2003
Location: Cullman, AL
Posts: 4,582
Radiator suggestions to keep a 401 cool

I have been fighting this ever since I installed this 401 many many years ago. Just recently I had my thermostat stick open. While I had the system open I flushed it and changed the coolant when I replaced the thermostat.
This made me start thinking about it again and a desire to want to try and fix it.

I rebuilt the 401 about 17 years ago. It is .040 over. Temps are pretty much never below 200. In the winter it runs at right at 200, even if it is 30 degrees outside. Setting at idle or at any speed. During the summer it usually runs at 205 to 210.
For a long time I thought it was the cheap aftermarket mechanical temp gauge. However a few years ago I swapped to some high quality aftermarket gauges and the temp readings are the same.
The radiator is a copper/brass 4 row I got from a local parts store. I bought it when I built the engine. It still seems fine and there is no damage to the fins or the tubes.
I have used a (new) mechanical clutch fan (yes the shroud was on there) and even a large electric fan (which is currently what is on there) Neither one make any difference.

I was wondering if there is any chance one of those aluminum radiators would do any better? I do not mind spending $200-300, but I can not swing $500 right now.
Anyone have any suggestions on a radiator with good cooling capacity that will not break the bank and will not leak in a week?
79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
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