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stant cooling system tester issues

volaredon

Well-known member
Joined
Oct 7, 2012
Messages
1,631
Location
IL
I have a Stant ST 255 cooling system tester. It don't work no more. I have oiled the pizz out of the innards thru the oil hole and still nothing.
I did get out of fixing cars for a few years and it sat, it used to work when I used it fairly regularly. now I have needed it a lot and have to always go borrow a co worker's.
I see they sell an ST 270 now, one of my co workers has that one, I see the differences mainly the way to release the pressure when finished. but that's on the adapter that goes to the radiator not within the pump itself. I also see that Stant offers parts for the 270 but nothing for the 255, the repair kit for the 270 says it only fits a 270,
so is this 255 junk, then? I'd like to rebuild it if possible instead of buying a new one.
 
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srmofo

Well-known member
Joined
Oct 15, 2009
Messages
6,161
Location
SW ohio
Open it up. There's nothing magical inside. Pretty simple 1 way valve design.

That's the only way to know for sure what's wrong with it and if its fixable
 
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