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Unread 02-23-2011, 09:14 PM   #16
Bnabb
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1993 YJ Wrangler 
 
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I am going to change the thermostat so please no more "change the thermostat" comments thank you guys a lot though

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Unread 02-24-2011, 05:56 AM   #17
Que89YJ
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LOL You guys are bad. You can see if the thermostat was stuck open by starting it cold and looking in the radiator for flow. I agree with everyone but I do agree that 100 is way low. The problem Bnabb, is that the guages are finicky at best and notoriously unreliable.
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Unread 02-24-2011, 07:19 AM   #18
jhumphrey
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Quote:
Originally Posted by Que89YJ View Post
LOL You guys are bad. You can see if the thermostat was stuck open by starting it cold and looking in the radiator for flow. I agree with everyone but I do agree that 100 is way low. The problem Bnabb, is that the guages are finicky at best and notoriously unreliable.
The gauge is not working because the thermostat is stuck open. While we'll all agree that Jeep infamously uses cheap/inaccurate gauges from the factory, the reason its registering 100 is because of the thermostat issue. I know this because Ive experienced the same thing the OP has... after the thermo change, it worked (and still does) fine.
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Unread 02-24-2011, 09:08 AM   #19
UltimatE
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Symptom 1: Temp Gauge reading low.
Symptom 2: No heat

Add them together is a stuck thermostat. Your gauge is most likely perfectly fine. Change the thermostat ... burp/purge the antifreeze and it'll be fine. If and only if after that is done, and your gauge isn't working correctly, and you have heat... change the temp gauge sender, located driver side back of the head on top, single wire, behind the intake. That simple.

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Unread 02-24-2011, 11:44 AM   #20
mightybg
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just for your info (since you asked about it), the temp gauge is driven off of the little guy on the back of the head, drivers side with one wire sticking out of it. I circled it in yellow.

added picture of what it should look like white connector is "switch with gauge" and a black connector is for "switch no gauge" that just turns on a warning light. They word it weird that is why it took me a while to get the Oreilly guy to understand what I was talking about.
tempguagesensor.jpg   temp-sender.jpg  
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Unread 02-24-2011, 03:11 PM   #21
Bnabb
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I bought my thermostat and I am going to change it as soon as I can. I will let all you guys know if/when your right.
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Unread 02-25-2011, 06:12 PM   #22
Bnabb
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So my thermostat definetly needed changed


So I have heat now but guage still reads 100, Like I though.
I need to change the sensor now then right? Anything special I need to know?
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Unread 02-25-2011, 06:47 PM   #23
mightybg
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if you go to oreilly's or autozone I don't remember where I bought it from, it was called a temperature switch with gauge. I remember that cause getting the guy at the counter to find the right part was difficult. and the difference I believe is the one that drive the gauge in the dash has a white connector and the one that is just a switch has a black connector. (see my previous post for pic).
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Unread 02-25-2011, 07:14 PM   #24
TheNewbie
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What the heck? How did it get bent like that?
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Unread 02-25-2011, 07:33 PM   #25
Bnabb
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That's how it looked when i pulled it out today. I asked my dad if he has ever seen a thermostat busted like that and he said that this was definetly his first. I have no clue how it did it.
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Unread 02-25-2011, 07:50 PM   #26
Noltz
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The brass failed either through corrosive action of the coolant or a mechanical failure. It's bent because the spring pushed it away from the 'base plate' (whatever it's called).

I have seen that, maybe 3 times in 13 years of servicing cars.

As for your gauge, I recommend you remove the little connector at the back of the head that was circled by mightybg. The gauge should fall to dead cold. Then ground the connector. Gauge should read full hot. THIS IS TO BE DONE WITH THE ENGINE OFF, KEY IN "RUN" POSITION. If it works fine (low/high) then replace the sensor.
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guage , heat , heater , sensor , temp

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