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Old 04-06-2011, 12:01 AM   #26
Wrencher86
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Sounds like you have an air bubble in the system. Somebody around here can probably tell you a Subaru specific method of burping the system. Generally speaking, make sure the radiator and the reservoir are completely full, turn on the heat, take it out and drive it hard to get the RPMs up. That should push through most of the air in the system. Then let it cool down. That usually takes care of things, just make sure your reservoir doesn't go empty (you can overfill it to begin with just to be safe).

That's a pretty general procedure. Anybody else feel free to correct or add to that if there's any specific process with Subaru's.
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Old 04-06-2011, 12:11 AM   #27
Seventh
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What I like to do (on any car really...if you don't have a lift) is find the steepest hill around and park with your front end facing forward up the hill. Your radiator will be the highest point in the cooling system, air goes up... you can see where I'm going with this. CAREFUL when opening the rad cap when it's hot, or just wait for it to cool is a better idea. Fill the radiator as much as you can.
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Old 04-06-2011, 12:33 AM   #28
NickGoober
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So wrencher, I would put max heat on, blowing at me, defrost whatever.. And push the car a little bit and then let it cool down?

And seventh I park up a hill/driveway and then fill it up? Also.. Do I fill in the spot where the turbo is? Or radiator
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Old 04-06-2011, 12:38 AM   #29
Seventh
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Radiator, that would be the highest point if you're facing up a hill. Air goes up. Follow?
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Old 04-06-2011, 01:11 AM   #30
NickGoober
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yes, well i just tried when i got home, to turn on the car with the cap open and heater on max to see if it would get the bubbles out but nothing happened. after driving today i let my car cool down for about an hour then i turned my key to the on position and the line went up to a little bit past first line to the halfway mark
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Old 04-06-2011, 02:10 AM   #31
NickGoober
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i just changed back to the oil coolant temp sensor, and now its back to usual, somewhat normal, but still the climb to the upper line before the fan turns on.. at least for now it dont skyrocket if i press on the gas -___-
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Old 06-21-2013, 04:31 PM   #32
fawcetteng
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sorry to resurect an old post, but anyone know where fuse 17 and 18 as shown in the above posted diagram are? Are they really the 17 and 18 under the dash behind the door - the manual says 18 is the backup light.
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Old 06-22-2013, 09:29 AM   #33
prometheum
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definitely not the relay, when relays go bad they normally become sticky, or work intermittently
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Old 06-22-2013, 11:14 AM   #34
Mulder
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Quote:
Originally Posted by prometheum View Post
definitely not the relay, when relays go bad they normally become sticky, or work intermittently
Thread is from 2011, OP hasn't been here since 2012.
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Old 12-27-2013, 07:43 AM   #35
alfiewrx
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Default Temp Issue

Hey guys I am having a similar issue, but my 04 wrx fans only turns on when I turn on the ac. I have already changed the temp sensor and the radiator and now starting to wonder if the fans have a switch that's bad. Guys I have recently purchased this car and cant drive without the ac on or the car will start over heating.
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Old 08-04-2014, 07:46 PM   #36
mooneyswrx
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Default overheating with no fan turn on without ac

Hey everyone. Im haveing the same problem nickgoober had a long time ago. Was hopeing someone has the answer. I have 04 wrx that overheats slightly when idle after driving or at low load cruising. The fans dont turn on until the second temp line or ac. But will overheat with ac fan running anyway. Also drops down to operating temp when i drop a gear and give her some gas. I have flushed her multiple times due to sludge. Changed thermostat and relays to the fans. Appreciate any help thank you
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Old 07-12-2016, 12:37 AM   #37
Fat Black Pig Sac
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I have same problem
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Old 08-01-2016, 11:19 AM   #38
wrxsabre
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Quote:
Originally Posted by mooneyswrx View Post
Hey everyone. Im haveing the same problem nickgoober had a long time ago. Was hopeing someone has the answer. I have 04 wrx that overheats slightly when idle after driving or at low load cruising. The fans dont turn on until the second temp line or ac. But will overheat with ac fan running anyway. Also drops down to operating temp when i drop a gear and give her some gas. I have flushed her multiple times due to sludge. Changed thermostat and relays to the fans. Appreciate any help thank you
My 02 WRX just started doing this also. I have no idea why. I did recently change the upper radiator hose and haven't burped the system in a while. It runs well below he halfway heat mark on the highway, but if I'm stuck at a light idling for more than 2 minutes, I watch the temp sky rocket to the 3rd line. As soon as I start moving or give it gas it goes down. It doesn't seem to go above the 3rd line, but this isn't normal for the car. If anyone has figured this out, please reply.
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Old 08-01-2016, 05:57 PM   #39
CosmoTheCat
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Plugged up radiator? Check for cold spots.
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Old 08-08-2016, 09:52 AM   #40
wrxsabre
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Thanks Cosmo.
I think that it was simply air in the system. I burped it and it happened one more time and I burped it again. I still "hear water running from the driver seat" occasionally (only once since I last burped it though). So, there is still probably some air in there. I do need to flush the system to get the gunk out. The fluid looks like there's corrosion in it. I have a new aluminium Mishimoto radiator so a little surprised to see particles in the fluid. Might be from other parts of the coolant system.

I did confirm that fans are running after I burped the system, so for the most part I think the issue is gone. I don't see it when I get off the highway anymore. Every couple months the system needs to get burped. I find if I do it with an oil change it helps to prevent this issue from occurring. I've had this issue for years. It will happen every six months if I don't burp the system. Many parts of my cooling system (water pump, radiator, thermostat, upper and lower radiator hoses and turbo hose) have all been replaced. I think it's just normal mode of operation for these cars.
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Old 05-07-2019, 07:15 AM   #41
C4epps
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My bugeye RS is doing the same thing. Burped it several times, and at stop lights it starts to creep up in temp. I've replaced everything under the sun on this car too..
Put some wet wetter in it, and it kinda slowed it down from doing it.
Once I get going from a light, seems to return to normal.
Just started doing it..is thisnthe beginning of a head gasket failure?
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Old 05-08-2019, 09:47 PM   #42
wrxsabre
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Quote:
Originally Posted by C4epps View Post
My bugeye RS is doing the same thing. Burped it several times, and at stop lights it starts to creep up in temp. I've replaced everything under the sun on this car too..
Put some wet wetter in it, and it kinda slowed it down from doing it.
Once I get going from a light, seems to return to normal.
Just started doing it..is thisnthe beginning of a head gasket failure?
I ended up replacing my fans to fix this problem. And changed all of my coolant hoses. Upper and lower radiator, both heater hoses, all of the ancillary hoses, and one coolant hose near the lower radiator hose. I also changed the upper resoviour from metal to the new plastic material. No more radiator issues. No head gasket problem. But still lots of work.
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