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View Full Version : Coolant cap untwisting itself, why?

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turbotalon1g
10-25-2009, 06:52 PM
Why is my car trying to kill itself?

Boost is way down to 25psi. after doing a 2nd - 4th pull on the street with boost at 27psi that time, now turned down to 25psi.

The coolant cap was twisted about 45 deg. and it pushed coolant into the overflow bottle.

I just don't understand why the cap would unscrew itself.

Aaron
notsostockgalant
10-25-2009, 06:53 PM
maybe the rubber gasket under the cap is wore out. or the spring is uber weak just thought of that
munchgsx
10-25-2009, 06:55 PM
Did you get the new HG installed?
turbotalon1g
10-25-2009, 09:20 PM
No new hg. New cap 2nd new cap
95talonracer
10-25-2009, 11:36 PM
Sounds like a bad HG.
Kevin 1G Drummer
10-25-2009, 11:46 PM
Sounds like a bad HG.
+1. Sounds like the system is getting over-pressurized. Between that, and the vibration of the engine, it's forcing the cap to untwist.
Pushit2.0
10-25-2009, 11:47 PM
My car would do this, and only after 1 run on the dyno. So I used a zip tie to hold the cap from twisting, this fixed my problem. I say it was from engine vibration, and this is why I had to safety wire my oil filter.

~John
95talonracer
10-26-2009, 12:02 AM
My car would do this, and only after 1 run on the dyno. So I used a zip tie to hold the cap from twisting, this fixed my problem. I say it was from engine vibration, and this is why I had to safety wire my oil filter.

~John
But was yours pushing coolant as well?
Pushit2.0
10-26-2009, 12:07 AM
No, not even with the stock cap. But I was not out driving it and would tighten the cap after 1 run. I switched to a 23psi cap and it still did it, so then I used a zip tie. For the 20miles I put on the engine no coolant pushing problems.

~John
95talonracer
10-26-2009, 12:10 AM
If his starts to move the cooland into the overflow then I am guessing there is pressure there from a bad HG.