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Old 12-09-2013, 08:46 PM   #1
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Ok, so I had a bit of a brain fart and forgot to check my antifreeze before this record cold snap. Was -10 on Saturday night and we decided to take the jeep on Sunday. Made it less than a mile and realized i wasnt getting any heat in the motor or out of the heater. I turned around and got home then the temp gauge was pegged when i shut it off. I let it cool, put some antifreeze in and turned on the heater and could get some heat and the motor had heat also. There were no leaks, didnt blow any freeze plugs, and the oil had no signs of water, vice versa. This morning was frigid also and i couldnt get more than 120 out of the motor and the heater would only blow ice cold air. So my first thought is thermostat is stuck open. Ok no biggy. I changed it, motor runs at normal temp now but i only get luke warm air from the heater. Thoughts???

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Old 12-09-2013, 09:04 PM   #2
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How low was antifreeze ? Could be a bad thermostat? You may have air in system...

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Old 12-09-2013, 09:09 PM   #3
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How low was antifreeze ? Could be a bad thermostat? You may have air in system...
Thermostat has been changed.
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Old 12-09-2013, 09:22 PM   #4
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The NEW one could be bad, had that happen twice now! Was it a fail safe stat? If it was and you got a bad one they stay open so engine doesn't heat up...
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Old 12-09-2013, 09:29 PM   #5
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The NEW one could be bad, had that happen twice now! Was it a fail safe stat? If it was and you got a bad one they stay open so engine doesn't heat up...
The old one was staying open so i was only getting 120 from the motor. New one in runs at normal temp but im only getting luke warm air
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Old 12-09-2013, 09:33 PM   #6
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If you run it without radiator cap on do you see bubbles? Another thing you may try is a new radiator cap, I typically put a new one on with a new stat. It made a difference for me...
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Old 12-09-2013, 09:37 PM   #7
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If you run it without radiator cap on do you see bubbles? Another thing you may try is a new radiator cap, I typically put a new one on with a new stat. It made a difference for me...
Ok, what psi or lb was it? Ive heard of guys getting a higher rated cap
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Old 12-09-2013, 09:43 PM   #8
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Ok, what psi or lb was it? Ive heard of guys getting a higher rated cap
. I went out and looked for you ...how's that for service?. LOL. 18# STANT
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Old 12-09-2013, 09:47 PM   #9
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. I went out and looked for you ...how's that for service?. LOL. 18# STANT
A real saint I tell ya! Thanx man i appreciate it.
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Old 12-09-2013, 09:53 PM   #10
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Anytime!
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Old 12-09-2013, 10:29 PM   #11
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Likely even though your gauge shows normal temps the engine still isn't getting as hot as normal. Even with the correct 195 thermostat mine fluctuates between 187 and 197 (per scangauge) on these cold days where it's below zero. Won't get above 200. I've been meaning to put some cardboard on the radiator so it will get hotter. I've noticed the difference in heat output when the engine is at 187 and 197 is pretty big. If it would run at the usual 210 I think it would be fine.

If you have the original heater core and have never flushed it that's probably not helping either.
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Old 12-09-2013, 10:31 PM   #12
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Join the club. Personally I decided that mine was just warm enough to make it through the winter and I'll deal with it come springtime lol.
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Old 12-10-2013, 12:01 AM   #13
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Have you tried blowing all the gunk out of your heater core? Busy out the garden hose and give it a blast. Takes 5 mins. Just disconnect the two hoses from your core and run the warmer through for a minute, until it comes out smooth and free of junk. Made my jeep go from Luke warm to hot as Hell!
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Old 12-10-2013, 12:55 AM   #14
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I will definitely flush the heater core. Thanx men!
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Old 12-10-2013, 10:41 AM   #15
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Well after the new thermostat it looks like i will be replacing the radiator as i have setting water in the bottom between the core and the plastic bung.
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Old 12-10-2013, 11:01 AM   #16
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Just saw a stock one for cheap on Portland CL. Somebody is parting out 1-2 wranglers. For what it's worth.

Edit: yup, still there. $40
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Old 12-10-2013, 11:10 AM   #17
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Just saw a stock one for cheap on Portland CL. Somebody is parting out 1-2 wranglers. For what it's worth. Edit: yup, still there. $40
Thanx, i can get a new one from macs for around a hundy
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Old 12-10-2013, 11:21 AM   #18
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Thanx, i can get a new one from macs for around a hundy
Prolly worth $60 more just for the peace of mind. Good luck.
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Old 12-10-2013, 01:08 PM   #19
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Id do a full system flush with the old radiator then put new one in that way you don't plug your new radiator up. Prestone makes a Flush/Fill kit you splice into heater line and it flushes entire system... Good luck!

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