What's the release valve on thermostat for?

StoneX · Mar 15, 2010

There is a release valve on the stock thermostat, but the Stant heavy duty 195 doesn't have one. What is it for? Does it matter if I install the one without a valve?

My XJ is a 93 4.0L AT.

wolfpackjeeper · Mar 15, 2010

I am not sure what valve you are talking about. If it helps, I believe the superstat is designed to fail in the open position instead of failing closed.

birchlakeXJ · Mar 15, 2010

Should be fine. The "jiggle valve" is designed to prevent air from being trapped under the thermostat. Generally not a problem on the 91-2001 XJs but you can drill a hole if you want, I usually do with a stat that doesn't come with it.

Here is a link to an excellent article that gets into this and other cooling issues.

http://www.aa1car.com/library/overheat.htm

old_man · Mar 15, 2010

Are you talking about the radiator cap?

joe_peters · Mar 15, 2010

The Stant SuperStat Premium has its own built in bypass.

All thermostats are made to "lock" open following an overheat situation.

Back in the early 90s I put a FailSafe brand thermostat in my Dad's F250 460 engine--freakin' thing BROKE and I ended up overheating on a Spring Bear hunt.

StoneX · Mar 15, 2010

Thanks for all the reply. The jiggle valve/bypass is what I was seeking. We can't attach pictures in the post, can we?

What's the release valve on thermostat for?

StoneX

NAXJA Forum User

wolfpackjeeper

NAXJA Forum User

birchlakeXJ

NAXJA Forum User

old_man

NAXJA Forum User

joe_peters

NAXJA Forum User

StoneX

NAXJA Forum User

Similar threads