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Old 01-23-2014, 12:11 AM   #1
Cbob123
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Default Odd coolant temp behavior

Searched thru other threads to see if anyone else has this issue.
Coolant temp gauge will go all the way up, after a boost pull the temperature will drop for a little.
Hoping it's just a thermostat but nothing else
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Old 01-23-2014, 12:12 AM   #2
Cbob123
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I'm simply looking to seek someone else's opinion
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Old 01-23-2014, 04:51 AM   #3
smirnon
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well, it could very well be just a blown fuse for your 2 fans up front, next thing would probably be your fan motor... but these are just my 2 cents worth
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Old 01-23-2014, 03:30 PM   #4
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Quote:
Originally Posted by smirnon View Post
well, it could very well be just a blown fuse for your 2 fans up front, next thing would probably be your fan motor... but these are just my 2 cents worth
2 cents is better than no cents, thanks for the input I'll look into it!
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Old 01-23-2014, 05:04 PM   #5
yebokmj
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Thermostat is most likely if it is when driving, seeing that the fans rarely come into play except at idle, usually the air flow through the radiator is enough when the vehicle is at speed.
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Old 01-24-2014, 09:10 AM   #6
Cbob123
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Last night the temp gauge was maxed and I almost crapped myself. I pull over and my engine was cold to the touch. I think it's just a faulty sensor... But id want to fix that so I know when it really is overheating lol
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Old 01-24-2014, 11:14 AM   #7
xSUNSHINEx
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You could have air in the system, have you tried burping it? Mine did the same thing when I first changed my radiator until all of the air worked itself out after me burping it a million times.
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Old 01-24-2014, 10:44 PM   #8
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Quote:
Originally Posted by xSUNSHINEx View Post
You could have air in the system, have you tried burping it? Mine did the same thing when I first changed my radiator until all of the air worked itself out after me burping it a million times.
If you're overheating and your radiator is cold, I agree with this guy.

Otherwise, it has to be t-stat. Possible but unlikely to be temp sensor.
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Old 02-11-2014, 03:13 PM   #9
Cbob123
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Attempting to burp it today. Just took my subie for a 30 minute cruise and the hot air never came on. Temp gauge was past the H and when I shut the engine off the coolant in the overflow tank was steaming and bubbling but came to a stop after a few seconds... Praying to baby Jesus I don't need a head gasket because the timing belt and water pump have been replaced withing the last year
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Old 02-11-2014, 03:27 PM   #10
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Quote:
Originally Posted by Cbob123 View Post
Attempting to burp it today. Just took my subie for a 30 minute cruise and the hot air never came on. Temp gauge was past the H and when I shut the engine off the coolant in the overflow tank was steaming and bubbling but came to a stop after a few seconds... Praying to baby Jesus I don't need a head gasket because the timing belt and water pump have been replaced withing the last year
You're gonna need a headgasket and check for warpage if you ran it above H. Your thermostat never opened.
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Old 02-11-2014, 03:40 PM   #11
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If you never got heat in the cabin, you are low on coolant. Maybe air in the system but when this happens and you overheat it, you reeeaaaallllyy overheat it. If the needle gets to hot when theres no coolant running over the sensor you baked the **** out of it. let it cool off completely, try and top it off with fluid/burp it and cross your fingers.
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Old 02-11-2014, 04:50 PM   #12
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Quote:
Originally Posted by Turd Nugget View Post
If you never got heat in the cabin, you are low on coolant. Maybe air in the system but when this happens and you overheat it, you reeeaaaallllyy overheat it. If the needle gets to hot when theres no coolant running over the sensor you baked the **** out of it. let it cool off completely, try and top it off with fluid/burp it and cross your fingers.
just burped the coolant and I got hot air!!! I put it on full blast so it burnt my face off. I took it for a 5 mile loop around my town and the needle stayed in the middle for the majority of the time. The only time it went back up to the top is after I did a few 4k pulls but I got out immediately and used my bare hand to touch the radiator, engine block, ect and it was normally warm.
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Old 02-11-2014, 05:47 PM   #13
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Quote:
Originally Posted by Cbob123 View Post
just burped the coolant and I got hot air!!! I put it on full blast so it burnt my face off. I took it for a 5 mile loop around my town and the needle stayed in the middle for the majority of the time. The only time it went back up to the top is after I did a few 4k pulls but I got out immediately and used my bare hand to touch the radiator, engine block, ect and it was normally warm.
Headgasket, under boost
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Old 03-16-2014, 06:33 PM   #14
Cbob123
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Update:
Just discovered one of the rad fans wires are melted from one of the FMIC tubes so I'm going to replace one of the rad fans.
The thermostat works because it opens up at 190. I just believe that it needs another fan to maintain proper temp.
I also noticed that there is no bottom pan and that the hood scoop is open, not allowing enough Air flow to focus on the rad.
Other than that there is no oil in my coolant nor coolant in my oil. Still going to get it tested.

Heat works great even at idle
No white smoke coming out of my exhaust (except when it's cold)


WORST CASE SCENARIO I do have to replace the head gasket

1)anyone recommend Blue Devil gasket sealant that you add to the radiator?

Or

2)where's the best and cheapest place to get them done? I'm not a millionaire
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Old 03-16-2014, 08:59 PM   #15
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No and the closest SUBARU SPECIALIST shop.
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Old 03-23-2014, 10:11 PM   #16
Cbob123
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Week later no overheating. Made a trip to rutgers (beachwood-brunswich) without overheating. Only time I saw the temp climb to 214 was at a red light right after getting off the parkway. Still only have on rad fan working is why. Other than that no problems
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Old 03-29-2014, 10:45 AM   #17
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bump...... still no overheating but after i do some "WAAAAAAHHHH PSHHHH WAAAAAAAHHH PSHHHH" and come to a stop light, ill notice the temp climb to 214 degrees max but no red zone. Im having trouble finding a replacement wiring harness for my Driver Side rad fan so if anyone can hook me up with a link that would be great so i can do more waaaaahhhh pshhhing around town
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Old 03-29-2014, 01:38 PM   #18
jason02wrx
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Really maverick?
Best post ever!
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Old 04-23-2014, 01:39 PM   #19
Cbob123
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Update:
New wiring harness, new driver side radiator fan, new relays and fuses (courtesy of Pro Com) but still occasional over heating.
I believe it's my own fault because when installing the rad fan, I accidentally knocked off the top radiator hose and made my driveway all pretty and green. Most likely didn't bleed all air bubbles out.
Also, got a compression & leak down test and it came back good.. So the worst case scenario of leaky/blown head gasket has been scratched off the list.
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Old 04-24-2014, 11:55 AM   #20
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"still occasional over heating"

If after all of that troubleshooting you are still overheating, you likely warped your heads man.It doesn't take much for these heads to go out of tolerance, especially overheating several times.

:/
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Old 04-25-2014, 08:21 AM   #21
Cbob123
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I got everything tested I'm fine. I caused air bubbles in the system by knocking the upper rad hose out and leaking coolant everywhere.
Burped it a couple times, also added more water than coolant and it's been running no hotter than 190.

You guys are worse than web MD, I could type in I have a cough and you'd tell me I have cancer lol
But I do appreciate everyone's input
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Old 05-20-2014, 04:16 PM   #22
Cbob123
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Solved issue, got tested for HG and head warp and I passed, and upgrading to mishimoto rad whenever UPS stops dragging their feet. Thanks everyone! Close thread admin pls
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Old 05-20-2014, 08:03 PM   #23
Scoobiesdoobies
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Quote:
Originally Posted by Cbob123 View Post
I got everything tested I'm fine. I caused air bubbles in the system by knocking the upper rad hose out and leaking coolant everywhere.
Burped it a couple times, also added more water than coolant and it's been running no hotter than 190.

You guys are worse than web MD, I could type in I have a cough and you'd tell me I have cancer lol
But I do appreciate everyone's input
If you are self diagnosing you health issues on web md you got other problems dude.
Also doctors misdiagnose all the time and they are the ones who get paid 500k a year not us.....
Glad u figured it out.
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