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Old 01-05-2007, 05:48 PM   #1
ascheier
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Default Car heats up after idling for a long time.

After driving for a while and coming to an idle my coolant temp starts to get really warm. It hasn't hit red yet, but that's because the light always turns green before it would have the chance. It starts after about 5 minutes or so of idle. After I start moving, it goes down immediately and all is good.

The only thing I can think of is when I replaced my turbo I lost about a tablespoon or coolant and didn't feel any needed to be added since it lost so little. Could there be air in there or are my fans borked?
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Old 01-05-2007, 05:50 PM   #2
Calamity Jesus
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Well, do your fans turn on when it gets hot, or not? If they don't, turn on your A/C and see if they come on then.
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Old 01-05-2007, 06:06 PM   #3
jason6787
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maybe a hairline fracture in cylinder 3. Factory Default. It happend to my car at 32,000 Miles. Subaru Replaced my block for me under warranty. I hope not but i've heard of this before making your car over heat at idle and be fine while driving.
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Old 01-05-2007, 09:43 PM   #4
al3xgonz
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maybe thermostat....
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Old 01-06-2007, 01:34 AM   #5
acidrain088
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most likley water pump or thermostat. the fan doesnt cool too much to the point of overheating. i would check the thermostat first in a pot of boiling water and if that doesnt fix it just replace the water pump.
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Old 01-06-2007, 01:37 AM   #6
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sounds like you have an air pocket.
have you verified your fans are plugged in?
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Old 01-06-2007, 02:12 AM   #7
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Quote:
Originally Posted by ascheier View Post
After driving for a while and coming to an idle my coolant temp starts to get really warm. It hasn't hit red yet, but that's because the light always turns green before it would have the chance. It starts after about 5 minutes or so of idle. After I start moving, it goes down immediately and all is good.

The only thing I can think of is when I replaced my turbo I lost about a tablespoon or coolant and didn't feel any needed to be added since it lost so little. Could there be air in there or are my fans borked?
Do you checked your coolant levels on a regular basis? Probably isn't going to make any difference. It does seem like either the thermo or the fans. Air is getting pushed through the radiator when you are moving which is why the cooling is fine then but when you stop the fans are there to ensure there is airflow through the radiator. I'm guessing the fans not kicking in because a dead thermo would cause the same issue.
Also why did you replace the turbo?

Quote:
Originally Posted by jason6787 View Post
maybe a hairline fracture in cylinder 3. Factory Default. It happend to my car at 32,000 Miles. Subaru Replaced my block for me under warranty. I hope not but i've heard of this before making your car over heat at idle and be fine while driving.
Do you know what caused the fracture to develop?

Quote:
Originally Posted by acidrain088 View Post
most likley water pump or thermostat. the fan doesnt cool too much to the point of overheating. i would check the thermostat first in a pot of boiling water and if that doesnt fix it just replace the water pump.
If it was the pump then it wouldn't be cooling the engine properly regardless if the car was moving or not.

Quote:
Originally Posted by ImprezaRSX View Post
sounds like you have an air pocket.
have you verified your fans are plugged in?
Doubt it. Both of my cars have or have had air bubbles and it makes no difference. Also my computer cooling is loaded with air bubbles and it makes little difference to cooling performance.
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Old 01-06-2007, 02:26 AM   #8
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ok, well after you troubleshoot everything else, check the air pocket
I'll bet you a free tune that it's an air pocket.
I've had it happen on many cars.

The temp sensor in our cars is in the crossover pipe. which just happens to be the highest point in the system (engine side). So any air pocket fills with steam in the crossover tube. At low rpm the water pump is turning slow and not creating enough flow or pressure to move water through the crossover pipe at a rate that keeps the sensor wet.

Last edited by ImprezaRSX; 01-06-2007 at 02:34 AM.
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Old 01-06-2007, 02:31 AM   #9
i_c_the_light
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There I go thinking air bubbles, which is probably not as bad as an air pocket.
If a bubbling sound is heard inside the when the engine is running is a good indication. An air pocket, bubbles, whatever is most likely to be in the heater core.
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Old 01-06-2007, 02:31 AM   #10
ascheier
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I_C, my previous td04 just quit spinning for some reason. I could reach in and force it to spin with my finger but after a few days it would stop again. It seems like a piece of my UP cat got caught in there (replaced that @ the same time), so I bought a used one with 10k miles and did the job myself. I check coolant during regular maintenance periods or when I have a reason to believe it's low (haven't had any time to go out and do it since this problem started, probably will Sunday)I will troubleshoot everything in this thread, thanks guys !
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Old 01-06-2007, 02:43 AM   #11
ImprezaRSX
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Quote:
Originally Posted by i_c_the_light View Post
There I go thinking air bubbles, which is probably not as bad as an air pocket.
If a bubbling sound is heard inside the when the engine is running is a good indication. An air pocket, bubbles, whatever is most likely to be in the heater core.
half right.
When the car is cool, the air pocket will move to the highest point in the system. however, when the engine is running and hot, the air pocket will result in a low pressure in the engine. When the system is solid it develops a pressure as temp rises because water doesn't compress, this keeps the water in it's liquid state and minimizes steam formation. If you add an air pocket into the system, the air compresses and water boils at the hottest points in the engine. This creates steam pockets that rise to the highest point (the crossover pipe). Since the temp sensor is in the crossover pipe, your indication will be the high temp of the steam and not necessarilly the temp of the engine.
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Old 01-06-2007, 07:38 AM   #12
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Just open your owners manual and read and perform the CORRECT cooling system burping process. I dont know why more members do not read how to do this, anytime you remove the turbo or any of the coolant lines you need to perform the steps.
I have seen so many incorrect answers to the burping process. Sure it takes a while to do it correctly but you wouldnt have this problem.
HINT*** The steps do not require to remove your radiator cap at any time.

Jay-R
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Old 01-07-2007, 08:14 PM   #13
ascheier
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So let me get this straight.

1. Idle
2. Take turbo reservoir coolant cap off when it starts getting hot
3. Repeat?

Do I use the turbo reservoir or the plastic one? Do you have any idea how hot the turbo reservoir would be if my car is overheating? I'd burn my hand ! Please let me know what's up.
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Old 01-07-2007, 09:24 PM   #14
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Wrong, I was hoping you would read your owners manual but here it is. I will spoon feed you.
These steps must be done in your driveway/ garage/ parked

1.) Top off plastic coolant resevoir
2.) Top off Turbo Coolant Resevoir ( metal one right next to intake manifold) do not drive the car
3.) Turn on heater to defrost and all the way up (speeds process a tad)
4.) Start car and hold to 3000 rpm's for 10 min ( even if it gets hot stay on it for 10 min)
5.) Turn ignition to acc to keep the fans running ( helps car cool off faster)
6.) Check both resevoirs and fill as needed
7.) Repeat steps 1-6 until no more coolant is added

**** Do not at anytime open the radiator cap, it will negate all the time spent on the proceedures above and will allow air back into the system*****

Jay-R

Quote:
Originally Posted by ascheier View Post
So let me get this straight.

1. Idle
2. Take turbo reservoir coolant cap off when it starts getting hot
3. Repeat?

Do I use the turbo reservoir or the plastic one? Do you have any idea how hot the turbo reservoir would be if my car is overheating? I'd burn my hand ! Please let me know what's up.
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Old 01-07-2007, 09:32 PM   #15
ascheier
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Quote:
Originally Posted by dibblejr View Post
Wrong, I was hoping you would read your owners manual but here it is. I will spoon feed you.
These steps must be done in your driveway/ garage/ parked

1.) Top off plastic coolant resevoir
2.) Top off Turbo Coolant Resevoir ( metal one right next to intake manifold) do not drive the car
3.) Turn on heater to defrost and all the way up (speeds process a tad)
4.) Start car and hold to 3000 rpm's for 10 min ( even if it gets hot stay on it for 10 min)
5.) Turn ignition to acc to keep the fans running ( helps car cool off faster)
6.) Check both resevoirs and fill as needed
7.) Repeat steps 1-6 until no more coolant is added

**** Do not at anytime open the radiator cap, it will negate all the time spent on the proceedures above and will allow air back into the system*****

Jay-R
The problem is, why should I need to ADD that much coolant when I only spilled a spoonful? Isn't there a way to get air out without dumping another gallon of unneeded coolant in, or is this the only way? This is why the owners manual isn't helping me, it is assuming I have lost a decent amount of coolant.
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Old 01-07-2007, 09:41 PM   #16
dibblejr
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Until you perform the proceedure you dont know how much you have to add. You may only have to do it once.
I lost what I thought was a little and it took me almost an hour to complete the proceedure.
You can second guess all you want but if not followed correctly you will be posting an overheating thread or possibly a I melted my engine thread.
I dont want to seem harsh, but I gave you the correct advice a long time ago, I figured by now you would have completed it and everything was fine now.
It is the propper way to add any coolant to your system, dont get all wrapped up on the quantity. The book does not assume a loss of significant coolant, it assumes that your engine temp is high.

Trust me this will solve your problem unless there is something you havent mentioned.

Jay-R

Quote:
Originally Posted by ascheier View Post
The problem is, why should I need to ADD that much coolant when I only spilled a spoonful? Isn't there a way to get air out without dumping another gallon of unneeded coolant in, or is this the only way? This is why the owners manual isn't helping me, it is assuming I have lost a decent amount of coolant.
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Old 01-07-2007, 09:46 PM   #17
ascheier
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Quote:
Originally Posted by dibblejr View Post
Until you perform the proceedure you dont know how much you have to add. You may only have to do it once.
I lost what I thought was a little and it took me almost an hour to complete the proceedure.
You can second guess all you want but if not followed correctly you will be posting an overheating thread or possibly a I melted my engine thread.
I dont want to seem harsh, but I gave you the correct advice a long time ago, I figured by now you would have completed it and everything was fine now.
It is the propper way to add any coolant to your system, dont get all wrapped up on the quantity. The book does not assume a loss of significant coolant, it assumes that your engine temp is high.

Trust me this will solve your problem unless there is something you havent mentioned.

Jay-R
Alright ! I trust you since you're steered me in the right direction many times. I'll get 'er done tomorrow. Thanks ! Also, do I keep both reservoir caps off while I'm doing this process? I don't want to screw up.
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Old 01-07-2007, 09:51 PM   #18
dibblejr
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Good luck and when you remove the metal resevoir cap use a towel just in case it splashes, dont get burnt it still may be hot even if the temp guage shows "c".
Use 50/50 coolant/water as described in your manual.
Let me know how it turns out.

Jay-R



Quote:
Originally Posted by ascheier View Post
Alright ! I trust you since you're steered me in the right direction many times. I'll get 'er done tomorrow. Thanks !
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Old 01-14-2007, 11:56 AM   #19
ascheier
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I did the steps and ended up putting about 3/4 a gallon of 50/50 in. I'm very surprised it took so much. I did everything right, took it for a drive, and idled for about 10 minutes and the temp did not get past half on the gauge (fans were running, I confirmed it) so we'll see if the problem is truly solved. Thanks !
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Old 01-14-2007, 06:11 PM   #20
dibblejr
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You should be good to go, now.

Jay-R

Quote:
Originally Posted by ascheier View Post
I did the steps and ended up putting about 3/4 a gallon of 50/50 in. I'm very surprised it took so much. I did everything right, took it for a drive, and idled for about 10 minutes and the temp did not get past half on the gauge (fans were running, I confirmed it) so we'll see if the problem is truly solved. Thanks !
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Old 01-14-2007, 11:01 PM   #21
ImprezaRSX
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Quote:
Originally Posted by ImprezaRSX View Post
sounds like you have an air pocket.
...
i love this guy!
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Old 01-15-2007, 12:19 AM   #22
ascheier
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i love this guy!
Thanks
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Old 01-15-2007, 03:18 AM   #23
ImprezaRSX
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anytime

Last edited by ImprezaRSX; 01-25-2007 at 11:18 PM. Reason: recieved infraction
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