Radiator Hose Spring
Jim Smart
January 7, 2016

We’re continuing our series of restoration tech tips with this little gem that might solve one of the most aggravating aspects of Mustang enjoyment—overheating. Have you ever been installing a part on a car, and wonder what that extra little piece is for, thinking, “Meh, that doesn’t’ do anything,” and throw it away? We’ve been guilty of the practice more times than we can count, but don’t be like us and stop doing that. An example is in the lower radiator hose.

We’re going to get arguments on this one, especially from hose manufacturers, but all molded lower radiator hoses should have an anti-collapse spring. What have we learned from not having one? Molded lower radiator hoses tend to collapse with an increase in engine rpm because the water pump draws more coolant out of the radiator than the hose can handle — negative pressure at the radiator and lower hose causing collapse. The hose collapses causing coolant starvation and overheating on the open road at high rpm. You get back in to town and temperatures return to normal. Avoid this with the anti-collapse spring, which is available from Marti Auto Works or nearly any NAPA Auto Parts store.