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Old 07-03-2019, 02:15 PM   #1
knightangle
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Default Engine temp JDM EJ205

03 WRX with jdm ej205 with working AVCS. Only mods are an spt intake and some mishimoto hoses.

On weekends I work 70 miles from home and stay with a friend. When I get there my temp gauge rises? It doesnít move any other time except when I get to work. Not when I go home at the end of the week end or anything only when I get to work. Itís happened twice so far.

First thought was shoddy t-stat or air in the system. I burped it while at work and fluids seem to be ok?

Thoughts? I tried reading through the forums while at work today but canít get through much. Sorry if this is repetitive or anything. I did my best to find something and couldnít.

Thank you in advanced
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Old 07-03-2019, 08:31 PM   #2
danger1138
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Check the coolant reservoir (right upfront alongside radiator)after the drive when you say that temps are beginning to rise. If you see that level of coolant has risen, alot, it may be a headgasket issue and the resulting leak from HG's no longer properly sealing is pushing coolant back into resevoir. Thats worst case scenario.

Best case scenario may be that you're thermostat needs changing.
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Old 07-04-2019, 07:47 PM   #3
kabz
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I had a bad turbo tank cap on my swap. Changing it for old one seems to have stopped the coolant coming out the top tank. Still runs hot though.
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Old 07-08-2019, 07:08 AM   #4
runner19
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I had the exact problem.

It turned out to be a partial blocked radiator. I swapped to a new mishmoto and the problem went away
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Old 07-09-2019, 02:00 AM   #5
knightangle
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Quote:
Originally Posted by runner19 View Post
I had the exact problem.



It turned out to be a partial blocked radiator. I swapped to a new mishmoto and the problem went away


That is the best news Iíve heard! Iím bringing mine to the shop tomorrow to have it looked at to determine the issue. Iím currently saving for a mishimoto radiator anyway!!! Just got my radiator tank in the mail today
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Old 07-09-2019, 04:14 AM   #6
Fahrezz
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Quote:
Originally Posted by danger1138 View Post
Check the coolant reservoir (right upfront alongside radiator)after the drive when you say that temps are beginning to rise. If you see that level of coolant has risen, alot, it may be a headgasket issue and the resulting leak from HG's no longer properly sealing is pushing coolant back into resevoir. Thats worst case scenario.

Best case scenario may be that you're thermostat needs changing.
+1
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Old 07-09-2019, 08:16 AM   #7
Shik
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Are both of your fans turning on? While driving with good air flow, they are not needed, but as soon as you stop the air flow, up goes the coolant temp.

When the car is sitting, especially after a long run, it will need the fans to bring the coolant temps back down to normal. The fuses do blow on occasions.

A new genuine oem Subaru thermostat and gasket is always good insurance if the age of the one that's in there is unknown, as are new oem radiator caps.
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Old 07-11-2019, 06:31 PM   #8
kabz
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Mine was doing the same thing. Running hot, like 205 F all the time then puking coolant at idle and generally being a pain.

So the Friday night after a camping trip, I changed out the thermostat, old one looked all scratched up, and may have been bad, and filled and rebled the cooling system.

This is where it gets crazy ... While re-bleeding, using a funnel in the turbo tank, I revved it up a bit, and blammo, a bubble blows the funnel right out of the turbo tank and coolant spills everywhere. I shut it right off then just left it to cool.

After cooling off I topped up the turbo tank, and she's been running at 180 ish ever since. No issues touch wood. I'm guessing you really need that 3000 rpm to flush air out of the heater and whatever other corners cause trouble. This is not compatible with having a funnel full of coolant on the turbo tank.

tldr: Read the FSM and bleed it their way. Top everything up. Cap it. Run it, rev it. Shut down. Cool. Top off and repeat.
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Old 07-14-2019, 02:29 PM   #9
knightangle
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Default Engine temp JDM EJ205

Quote:
Originally Posted by danger1138 View Post
Check the coolant reservoir (right upfront alongside radiator)after the drive when you say that temps are beginning to rise. If you see that level of coolant has risen, alot, it may be a headgasket issue and the resulting leak from HG's no longer properly sealing is pushing coolant back into resevoir. Thats worst case scenario.

Best case scenario may be that you're thermostat needs changing.


Can you explain why rising levels mean gaskets? If it were gaskets wouldnít it be all the time? Overheating that is
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Old 07-15-2019, 01:58 AM   #10
danger1138
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The rising coolant in the 'coolant reservoir ' indicates that the system for one reason or another cant sustain the pressure throughout the system the way it should, possibly due to a leaky headgasket (very slight possibly) , hence it escapes to the next viable option which is the coolant resevoir.
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Old 07-15-2019, 04:05 PM   #11
knightangle
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This could be due to an air bubble to right? Which is what I think it is. I was adjusting some hoses and never tightened the clamps and was missing one. A full flush and clean of the cooling system should do it right?
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Old 07-19-2019, 10:17 PM   #12
kabz
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Yeah, I'd say just make sure the main radiator is full, then top up the turbo tank, and put the caps on, and run it at 3000 rpm for 5 - 10 minutes with heater on full blast hot. Let it cool and verify the turbo tank is still full.

See the FSM for the full procedure, but you need it turning over fast to flush the air out the heater. Mine was a bugger to bleed.
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Old 07-20-2019, 02:01 PM   #13
NicMonte
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Did you change the thermostat? Or is it original from the jdm.
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Old 07-20-2019, 05:55 PM   #14
knightangle
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Original jdm tstat. I did the swap back in March. I cleaned IACV today and took out SPT intake and drove it for an hour or so. It didnít start over heating when I got off highway and sat in a parking lot for 20 minutes

I have a timing belt Iím just waiting for free time to do
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Old 07-20-2019, 07:11 PM   #15
NicMonte
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When you do the timing belt, which id highly advise, change the water pump and thermostat(oem) your thermostat may be faulty and not properly working(which makes sense, because itís old) I did my swap back in March as well, and I did all those maintenance items while the engine was on the stand. I also reused my usdm upper rad tank and cap as well. If itís over heating and then not overheating, my guess would be the thermostat. But Iím not 100% sure, and that is if you properly burped the system. But Iíd start there for sure and if you can...donít drive the vehicle until you change those things first. But thatís just ?me?
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