Running too cool? - Page 2 - JeepForum.com
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post #16 of 26 Old 09-15-2012, 10:12 AM Thread Starter
mbardeen
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Me too. I noted that the old cap was 16 PSI, and the new one was 13 PSI. Pehaps that's the reason?

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post #17 of 26 Old 09-15-2012, 02:10 PM
djb383
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Lowering the cap psi from 16 to 13 simply lowered the coolant boiling point from 260 to 251.
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post #18 of 26 Old 09-15-2012, 04:39 PM
wgirvine
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Changing the cap will definitely keep the engine cooler. It increases the earth's declination from 23 to 23.8 degrees, and decreases the inclination and recipracation by the appropriate values. All of this increases the longitudinal stability of the diffractive girdle springs, but at a sacrifice in coefficient of thermal transfer. However, this is more than compensated by increased rotational speed of the cooter valve. Thus, the engine now runs cooler.

Hope that cleared it up...

The road goes on forever, the party never ends....
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post #19 of 26 Old 09-15-2012, 07:45 PM Thread Starter
mbardeen
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Quote:
Originally Posted by wgirvine View Post
Hope that cleared it up...
'tis magic!

Only other thing I did was to stick a new rotor on the distributor. That shouldn't make it run hotter, should it?
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post #20 of 26 Old 09-15-2012, 09:59 PM
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Hotter no, better yes.
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post #21 of 26 Old 09-16-2012, 02:19 AM
straightsixjeep
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My xj's temp gauge randomly dropped to 100* one day, after ten minutes its would climb back up to the normal range then drop randomly. I changed the $10 coolant temp sensor and put in a new stant fail safe t-stat and its reading perfect.
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post #22 of 26 Old 09-16-2012, 05:21 AM
sAe23
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Quote:
Originally Posted by mbardeen View Post
Finally figured out why the Jeep was running too cold. Radiator cap! I changed the old one out with a new Stant cap, and now it runs at the right temp.

One less thing on my to-do list!
...? Wasn't it fixed by replacing the t-stat??
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post #23 of 26 Old 09-16-2012, 08:20 AM
djb383
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Quote:
Originally Posted by straightsixjeep View Post
......and put in a new stant fail safe t-stat and its reading perfect.
Stant does not make a "failsafe" t-stat.

http://www.stant.com/Consumer-Produc...of-Thermostats
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post #24 of 26 Old 09-16-2012, 04:02 PM
straightsixjeep
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Quote:
Originally Posted by djb383 View Post
Stant does not make a "failsafe" t-stat.

http://www.stant.com/Consumer-Produc...of-Thermostats
Good call, now that I research it you are correct. At the parts store there were 2 t-stats to choose from, they told me the more expensive one was a "fail safe" one. The one I bought is a Stant Superstat 45359
http://www.summitracing.com/parts/SNN-45359/
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post #25 of 26 Old 09-16-2012, 05:27 PM
GetLifted
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Yea also not sure on the cap making it run cool


but i lol'd good at the egypt glifs
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post #26 of 26 Old 09-16-2012, 08:17 PM Thread Starter
mbardeen
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No, it was not completely fixed by replacing the t-stat. The temp gauge is still reading a shade above the 80C line. And no, the coolant cap didn't fix it either. It still climbs to around 100C at times, usually when sitting in traffic on a hot day. It also seems to depend greatly on ambient temperature. Heck, this might even be normal.

Yes the distributor rotor definitely made it run better.
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