Re: Running a bit hot,,,Question!

[Eric Sturgis <ericsturgis@xxxxxxxxx>]

Mo, not all of the overflow tanks hold pressure.  Only the new cars do that.  The old fashion kind do not hold pressure they are just an overflow tank and the contraction of the liquid makes the vacuum that draws the fluid back into the radiator.  The new cars it's not so much an "overflow tank" as it is an expansion tank and is part of the system. 

 

On an old car, lets say a 1969 Dodge Dart, it is truly an overflow tank, it holds no pressure and truly is just a bucket that will hold fluids and as the motor cools let them draw back into the radiator, and if it was broken or missing from the car it would work just like one of our cars.  It would puke out a little bit of coolant and have a air gap in the radiator when it was cold.  We would have to add fluid to it every now and then and check it every time we filled it up with gas.  However if you take that plastic tank off of our 2006 Jeep it would not just make little dribbles, with out it, it would dump all the radiator fluid out on the ground and overheat within a few minutes of start up.  To our new cars that plastic bottle is more of an expansion tank for the cooling system, not just for overflow.  Some of them are designed to catch sediments as well as hold the extra cooling fluid so you can easily tell it's condition at a glance. 

 

You can retro fit either system to a car like ours.  The plastic tank for Mopars from the 60's would look just fine under the hood and work really well for our cars.  It's just a white plastic tank with a rubber hose the goes from the overflow of the radiator to the bottom of the plastic tank or it goes through the top of the plastic tank through an opening in the top cover (it depends on what car you take it from, both work the same) and you just keep the fluid filled to the "Cold" mark and check it when the car is cold.  To do the pressurized system you need a different type of radiator cap for the radiator as the expansion tank from a new car with become the new pressure cap.  You have to get the lines from a donor car, a 1980's VW or Mercedes has a system that would be compatible with our older cars, and I'm sure lots of others too. 

 

Either way you go, they are both very nice systems, only is more sealed than the other, but both work just fine. 

 

This is an example that will work with your current system, just bolt it on the car, and that rubber line goes to the radiator overflow nipple on radiator. (hehe I said nipple)  http://www.streetperformance.com/part/dorman-products/engine-coolant-overflowexpansion-tank/5577659-603-419.html

or this one http://www.streetperformance.com/part/dorman-products/engine-coolant-overflowexpansion-tank/5577433-603-624.html

 

Or go junk yard shopping.  It's fun!

 

--

Eric

Tacoma, WA

1962 Chrysler Newport 2 door HT

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