Re: Overheating-1941 120

Posted by TxGoat On 2025/3/14 9:15:23

Do you fill the radiator to the top? If you do, some coolant will be ejected as the engine warms up.
Be sure it is actually overheating. It is normal for the engine to get hot, and 170 to 190 F is normal.
A modern thermostat may not work well with the pre-war system.
If the radiator shop told you the radiator was flowing poorly AFTER cleaning, it may be the culprit.
A product called Thermocure may improve the situation. Use exactly as directed.
If any loose debris remained in the engine after flushing, some of of it may have got into the radiator, It takes very little debris, like rust flakes, to restrict radiator flow, especially if it is already partially clogged
As suggested above, be sure timing is correct, and be sure the fan belt is doing its job.
Many Packards used a honeycomb type radiator core, and they can be very hard to clean out.