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Old 06-30-2014, 10:24 PM   #1
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Angry Overheating issues, new thermostat ??

Good evening all,

Several weeks ago I was getting fluctuations between 210 and redline, then back down then back up. New 195 thermostat fixed that.

Today, ony my way home, everything is fine, then all of a sudden i am in the red line and it just stays there. I pull over, let it cool down, and then i am able to get another 5-6 miles down the road, then red line again.

I just replaced the thermostat a few moments ago. I let it run in the garage, and sure enough, I am inching towards overheating. If i touch the hose on top leading to the thermostat, it is very hot, and very firm. Bottom hose it not as hot, and i am able to squeeze. The coolant is spewing out from the gasket between thermostat and the housing that has the temp sensor and hose connections.

I have placed the old thermostat into a pot of water on the stove and watched it open at ~200* as it should.

So, what else would stop the coolant from getting passed the thermostat? I can turn on my heater and get hot air.

I dont know what else to check. I dont see any coolant leaking from water pump area.

Please help.

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Old 06-30-2014, 10:27 PM   #2
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The heater core bypasses the thermostat. Sounds like a bad t stat to me. Sucks but new stuff can be bad to start with and confuse the purchaser thinking. " I just fixed that! What else can it be?"

Don't by a fail safe replacement one they suck. Fail and stay stuck open. Get a Stant.

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Old 06-30-2014, 10:29 PM   #3
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Good evening all,

Several weeks ago I was getting fluctuations between 210 and redline, then back down then back up. New 195 thermostat fixed that.

Today, ony my way home, everything is fine, then all of a sudden i am in the red line and it just stays there. I pull over, let it cool down, and then i am able to get another 5-6 miles down the road, then red line again.

I just replaced the thermostat a few moments ago. I let it run in the garage, and sure enough, I am inching towards overheating. If i touch the hose on top leading to the thermostat, it is very hot, and very firm. Bottom hose it not as hot, and i am able to squeeze. The coolant is spewing out from the gasket between thermostat and the housing that has the temp sensor and hose connections.

I have placed the old thermostat into a pot of water on the stove and watched it open at ~200* as it should.

So, what else would stop the coolant from getting passed the thermostat? I can turn on my heater and get hot air.

I dont know what else to check. I dont see any coolant leaking from water pump area.

Please help.
Did you burp the cooling system of the air that was introduced into it when it was opened up to install the new thermostat?
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Old 06-30-2014, 10:30 PM   #4
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but it opens when i place it in a pot of boiling water .... I forgot to mention that the radiator has also been replaced. The old one had a crack in the top plastic. I dont think its a failsaif. How do i check?
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Old 06-30-2014, 10:31 PM   #5
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Jerry, I did not burp the system as I long as i normally do, but yes, I did burp it some.
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Old 06-30-2014, 10:33 PM   #6
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A failsafe thermostat commonly sticks in the open position which of course would not cause your engine to overheat. That comment made above about failsafe thermostats was just some distracting noise to sift through.

As I suggested above, you could just have trapped air in the cooling system that needs to be more thoroughly burped out.
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Old 06-30-2014, 10:37 PM   #7
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It's not. Burping as Jerry said is a good thought let it run parked up a steep hill or jacked up in front. A hot firm upper and a cool lower sounds like t stat failure. A failsafe stays open. You run cool. You don't have one. They suck though so don't buy one.

Noise lol. Prestigious. Thanks man.
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Old 06-30-2014, 10:37 PM   #8
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and to properly burb out the air, i simply leave the cap offthe radiator and slowly squeeze the top hose, right? Is there another way?
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Old 06-30-2014, 10:40 PM   #9
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and to properly burb out the air, i simply leave the cap offthe radiator and slowly squeeze the top hose, right? Is there another way?
Park on a steep hill. Or jack up the front end and leave the cap off make gravity work for you.
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Old 06-30-2014, 10:45 PM   #10
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and to properly burb out the air, i simply leave the cap off the radiator and slowly squeeze the top hose, right? Is there another way?
Remove the heater hose from the thermostat housing. Fill the Radiator until coolant comes out of where the heater hose was connected.

Replace the heater hose and continue to fill the Radiator. Once it's full put the Radiator cap on, start the engine and hold the RPMs up a tad until the thermostat opens. Shut the engine off. Check and fill the radiator after everything has cooled off.
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Old 06-30-2014, 10:59 PM   #11
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ok, so i burped as much as i could. Filled up until it started coming out of heater tube port, put heater tub back on. Continued filling up and burping top hose. Everything was looking good. Stayed at 210 and slightly over. Let it contiue to run, placed cap on the radiator, got 1.5 miles down the road, red zone, made it back home,top hose is hard and hot. Steam spewing out from radiator cap.... I placed heater on full blast, no heat.

what the heck.
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Old 06-30-2014, 11:03 PM   #12
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It's starting to sound like the water pump may be failing. Is there any coolant leaking from its weep hole?
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Old 06-30-2014, 11:03 PM   #13
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T stat. Said it before. Burping is always good but I don't think it's your problem. Sorry if your hearing noise lol it follows me.
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Old 06-30-2014, 11:03 PM   #14
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not that i can tell because the cap is spewing it all over so i dont know what is from where. The weep hole is on the bottom, right?
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Old 06-30-2014, 11:04 PM   #15
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T stat. Said it before. Burping is always good but I don't think it's your problem. Sorry if your hearing noise lol it follows me.
but if the thermostat opens in a pot of water, that should eliminate a faulty one, shouldnt it?
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Old 06-30-2014, 11:06 PM   #16
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It's starting to sound like the water pump may be failing. Is there any coolant leaking from its weep hole?
I dont know what else to check. I dont see any coolant leaking from water pump area.
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Old 06-30-2014, 11:07 PM   #17
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but if the thermostat opens in a pot of water, that should eliminate a faulty one, shouldnt it?
That's your old one correct?
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Old 06-30-2014, 11:08 PM   #18
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not that i can tell because the cap is spewing it all over so i dont know what is from where. The weep hole is on the bottom, right?
Yes it typically is a slow drip after parked off the front if the oilpan.

Longer you let it go the worse it becomes.
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Old 06-30-2014, 11:09 PM   #19
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yes. same problems with brand new one. exact same symptoms, but thsi time i dont have heat
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Old 06-30-2014, 11:10 PM   #20
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Yes it typically is a slow drip after parked off the front if the oilpan.
Its been parked since i got back, what 5-10min now. Keeping an eye on the bottom side, no leaking or dripping. ALl i hear is gurgle-gurgle from the top radiator hose.
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Old 06-30-2014, 11:11 PM   #21
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not that i can tell because the cap is spewing it all over so i dont know what is from where. The weep hole is on the bottom, right?
Yes the weep hole is near the bottom of the water pump. It indicates a bushing is going bad.

But that your cap is spewing coolant is new information. Before going any further, I'd replace it with a new 18 lb. pressure model. It could be not allowing the cooling system to pressurize as it needs to by either leaking air or not being the correct 18 lb. pressure model.
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Old 06-30-2014, 11:13 PM   #22
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cap is new along with radiator. which was also replaced a few weeks ago due to a top crack. i gathered it was the pressure from the build of and the cap was releasing that pressure as it should.
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Old 06-30-2014, 11:16 PM   #23
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Heat thing is odd since it by passes T stat. The fact the upper is hard makes me think pump works. No heat makes me think a clog or failing pump. Something is making that hose firm. My guess is a working pump and bad t stat. The heat maybe a clogged core. Lots of issues brother. Just can't see the top hose getting hot and hard otherwise.

A pressure test can be rented for free from oreileiys or the zone if you suspect a weep hole leak.
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Old 06-30-2014, 11:17 PM   #24
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So long as it was an 18 lb. model cap that's good. All I can think of now is the water pump. My TJ has overheated twice in the past 5 years since buying it used from a friend after my previous TJ was stolen... the first time it was from the thermostat sticking shut and the second time was from when the water pump started failing.

And an easy way to confirm that the overheating is not being caused by a defective thermostat is to temporarily remove it and drive with it out of the system.
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Old 06-30-2014, 11:18 PM   #25
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ok, one more bit of detail that Ican think of.
This all happened after i droped down a gear to pass someone in 2nd, got the RPMs pretty high, around 4k.

Thats the only other thing I can think of that happened right before my "Check Guages" light came on and I saw that i was at the red line.
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Old 06-30-2014, 11:19 PM   #26
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Jerry,

Yes it is an 18lb cap. I was thinking of removing the t stat and running it but didt know what harm, if any that would cause.
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Old 06-30-2014, 11:20 PM   #27
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but then again, i dont get why it will run without the radiator cap on for 10-15min, then as soon as i put it on and go down the road, instant over heat.
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Old 06-30-2014, 11:21 PM   #28
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Removing the thermostat temporarily won't cause any harm in these summertime conditions. I drove mine like that for several weeks when I didn't have the time to replace it after it failed on the trail.
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Old 06-30-2014, 11:24 PM   #29
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ok, so thats what I'll do. Remove the t stat and see how it runs from there.I'llpost back when i can.

Thanks for the help y'all.

edit: one last thing -- my passenger floorboard is soaked and i see a slight trickle coming down the firewall. AC condensation backing up ... heater core... who knows.
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Old 07-01-2014, 01:58 AM   #30
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Good evening all, Several weeks ago I was getting fluctuations between 210 and redline, then back down then back up. New 195 thermostat fixed that. Today, ony my way home, everything is fine, then all of a sudden i am in the red line and it just stays there. I pull over, let it cool down, and then i am able to get another 5-6 miles down the road, then red line again. I just replaced the thermostat a few moments ago. I let it run in the garage, and sure enough, I am inching towards overheating. If i touch the hose on top leading to the thermostat, it is very hot, and very firm. Bottom hose it not as hot, and i am able to squeeze. The coolant is spewing out from the gasket between thermostat and the housing that has the temp sensor and hose connections. I have placed the old thermostat into a pot of water on the stove and watched it open at ~200* as it should. So, what else would stop the coolant from getting passed the thermostat? I can turn on my heater and get hot air. I dont know what else to check. I dont see any coolant leaking from water pump area. Please help.
Hold on now, you say coolant is spewing from the thermostat housing gasket area? We'll it sounds to me like this could be the main problem. Simply remove the housing, clean the flanges and apply new gasket. You are probably overthinking this one. System is not building pressure properly if it's spewing coolant out of gasket flanges.

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