Re: 1941 Packard Clipper Eight Special Sedan

Posted by HH56 On 2016/9/19 12:45:05

200 sounds a bit high although it can get that high after a run and then hitting idle speed in traffic. They will generally cool down after a few minutes if that caused the higher reading. I believe the typical average depending on thermostat chosen is around 170-180 but it does vary.

If the car has been idle for a long time and its condition beforehand was marginal there could be some issues with rust or sediment in the engine covering the water jacket. The radiator flow could be compromised or the water distribution tube in the block behind the water pump could be clogged or deteriorated. Those are typical conditions that would tend to cause the car to run warmer as would timing or a stuck closed heat riser valve or a restriction in the exhaust system.

There is also a distinct possibility the old temp gauge is not reading correctly. You could check with an infrared device to confirm the high temps if you haven't used other means already. If the temp gauge does appear to be off one thing to be aware of is the sensing bulb in the head has likely not been removed for decades if ever. There is every chance sediment and corrosion has caused the bulb to become stuck in the head. Use every precaution if you try to remove it -- penetrating fluid and time but even then it may be damaged or the bulb twist off the tube when being removed.