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Old 08-24-2012, 06:34 AM   #1
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Thermostat

Is there any way to tell if that us going out besides taking it out. Because jumped in the jeep this morning went to go put heat on for the first time in a long time and there was no heat.

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Old 08-24-2012, 06:50 AM   #2
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What is the water temperature? If the water temperature is low also, it's a thermostat problem. If the water temperature is normal, it's a clogged heater core or a problem with the blend door diverting the air across the core. To check if the core is clogged, are both the inlet and outlet hoses to the core hot?

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Old 08-24-2012, 09:34 AM   #3
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Even with a wide-open thermostat, the engine will get hot enough for some heat. I just replaced a broken thermostat last week; engine was getting to 160*F.
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Old 08-24-2012, 10:25 AM   #4
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X2 on Neil's comments.
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Old 08-24-2012, 10:44 AM   #5
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Originally Posted by Tjwrangler1997 View Post
Is there any way to tell if that is going out besides taking it out.
Observing the temp gauge should provide a reasonable clue.
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Old 08-24-2012, 10:52 AM   #6
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K thanks guys. Will look at it when i get off
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Old 10-18-2012, 08:09 AM   #7
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Hey guys, I know this is an old thread, but I was thinking I might need to change my thermostat and ran across this. The mornings have been getting pretty cool here, so I've been starting my 97 TJ a little early to defrost it. After running for 10-15 minutes, it's not quite up to operating temp, and the heater is not as hot as it should be. Shortly after I drive off, the temp goes up to normal(~210), and the heater is very warm. Do you guys think I should change the T-stat? And could anyone enlighten me on the 'burping' procedure? Thank you all.
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Old 10-18-2012, 08:46 AM   #8
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A new thermostat is the likely fix, be sure to only get the factory specified 195 degree model. Stant and Robertshaw are two good brands.

Two good ways to burp... 1st is with a thermostat that has a burp hole in it like shown below. That will let the air out through the top radiator hose. If you can't find one, you can drill your own as shown in the second photo. Position the thermostat with the hole at the top.

The second is to disconnect the heater hose at the water pump fitting and fill the system up which will get the air out from there. I prefer just using the style of thermostat shown below.

One more thing... avoid the so-called "failsafe" thermostats. Those do little more than get hung up in the open position and then your engine won't warm up properly.
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Old 10-18-2012, 09:08 AM   #9
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Quote:
Originally Posted by Jerry Bransford View Post
A new thermostat is the likely fix, be sure to only get the factory specified 195 degree model. Stant and Robertshaw are two good brands.

Two good ways to burp... 1st is with a thermostat that has a burp hole in it like shown below. That will let the air out through the top radiator hose. If you can't find one, you can drill your own as shown in the second photo. Position the thermostat with the hole at the top.

The second is to disconnect the heater hose at the water pump fitting and fill the system up which will get the air out from there. I prefer just using the style of thermostat shown below.

One more thing... avoid the so-called "failsafe" thermostats. Those do little more than get hung up in the open position and then your engine won't warm up properly.
x2 ill never use a fail-safe thermostat again!
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Old 10-18-2012, 12:31 PM   #10
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Bumping this one for an add on question as I found this thread while searching.

I recently replaced my thermostat, and the replacement was one of the fail-safe kind. Now it may just be coincidence but now after my little water plunge I saw that my temp is only going up to about 160-175 ish instead of the solid 210 its ran at since I bought it.

It would seem that maybe my fail-safe thermostat has indeed failed and stuck in the open position?

The heater and everything else is working fine however.

It's always ran dead solid at 210 this is the first i've ever seen anything like this, and it just happened to be 2 days after its swim.
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Old 10-18-2012, 12:34 PM   #11
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Sounds like it's stuck open... I just replaced mine and the PO had one of them funky fail safe ones on there.
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Old 10-18-2012, 12:34 PM   #12
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Yep, your fail-safe thermostat has done what commonly happens to them... stuck in open position.

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