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Old 01-06-2013, 03:20 AM   #1
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How much should I be concerned-Thermostat

Hi, While investigating why the coolant on my 98'TJ expansion tank keep on "disapearing" I found a small leak just below the thermostat housing. Yesterday I replaced the thermostat but found that the new thermostat had a small bearing in the "breather" hole. Problem, on the old thermostat there was no ballbearing...!! Where could it have gone...??
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Old 01-06-2013, 06:45 AM   #2
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Wouldn't even worry about since no telling if it's the original t-stat or PO may have drilled it out. Even if it was lost in the cooling system , obviously your Jeep hasn't been affected for this long.

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Old 01-06-2013, 08:38 AM   #3
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Problem, on the old thermostat there was no ballbearing...!! Where could it have gone...??
Heater core or radiator.
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Old 01-06-2013, 10:38 AM   #4
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Most thermostats that have vents in the flange simply have a hole there. You sure your old thermostat ever even had a check-valve ball in that location?
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Old 01-07-2013, 11:33 AM   #5
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Hi, First photo taken just before the old thermostat was removed. Note all the old gasket sealant as well as the fact that the old thermostat was not even positioned correctly...90 degrees out! It surely gives some hope that sometime or another the PO did something and hopefully that is when the "ball bearing" went somewhere, hopefully outside the block...
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Old 01-07-2013, 01:38 PM   #6
Knows a couple things...

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Again, not all vented thermostats have that little check valve that can look like a ball bearing to some.

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