[prairiedog14]

Hello My boss just bought a 37 Lasalle. It is over heating.I have never worked on a V8 flat head before. Radiator is flowing great. Has a new water pump. Flused system it is very clean. Runs for about ten min pegs gauge. Can someone give me a idea of what is going on. Any help would be appreciated. Thank You Jim

[AntarcticDave]

Hi Jim,

If you go to the Cadillac & LaSalle Club website forum and do a search on 'overheat flathead' you will find many cnoversations. These engines are notoroius for sediment building up in the block. If you get a factory serviceman bulletin reprint (often available on Ebay) it will describe how to flush these engines. A standard flush doesn't do much. Basically you have to take a metal tube with compressed air and pull out one head bolt at a time, insert it, and blow out the sediment using compressed air.

Other things to check are the radiator itself, and if the thermostat is out, it may be flowing too fast. Good luck, they are great cars!

Dave

[prairiedog14]

Hi Dave

Thanks for the info will let you know when I fix it.