1950 Overheating in traffic in Buick - Post War Posted August 31, 2010 I think that you can really assume it's a little plugged...especially if it's original to the car and never been serviced. That's a lot of time for crud to build up, and your standard in-car flush doesn't get it all. If it's in good shape, a boil out shouldn't be more than 50-75 dollars, and could make a world of difference. It could also bring about some real issues, like pinholes, etc. I had to have mine recored to the tune of $475, and that was 3 years ago.