my 72 cutlass supreme (350 motor)didnt come with a factory overflow container that im aware of .seems most overflow hoses of this era clip in alongside the radiator and empty on the ground .i notice now that its getting in the upper 80s to 90 degrees outside ,and after a good cruise i get antifreeze blowing out the hose .not alot maybe a couple ounces.but it seems to do it often.naturally i check it and top it off when needed.my question is how much is too much ? are many of you guys installing overflow tanks to catch the antifreeze ?

 

You are in the never ending cycle of overfilling your radiator. There is a mark on the side tank that shows the full level. Its about 3 inches down from the neck and the coolant should be just above the auto trans cooler. When the coolant gets hot it expands, if there is no head space it just muscles past the cap and winds up on the ground.

 

That's generally the level I keep it at . The engine temp runs right around 200 degrees with a 190 stat so it's really not an overheating issue. Thanks Eric

 

There are 2 ways to go about this.
1. keep filling any coolant the rad pukes out.
2. Buy a cheap overflow bottle and mount it on the right side fender. $10.00 and you're done, unless you want an expensive 200.00 repop. Universal Radiator Coolant Reservoir

 

Thanks Allan I may go with an overflow to keep the antifreeze off the garage floor

 

I have an OEM overflow in mine. It also was prone to puking coolant after it was shut down. There is a difference between OEM and aftermarket reservoirs BTW. The one I linked for you is the econo version and works just as well as the one I paid big $$ for. Consider what you need or want and go from there.

 

Will do .thanks

 

If you have it at the proper level then the cap may be weak. There are a lot of us with no overflow bottle and never lose coolant.

 

Well, three ways: Let it discharge antifreeze, check the level it's gone down to, remember where that is, and don't fill above that in the future (unless that level is well below the —FILL LINE— embossed in the tank.

- Eric