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Old 11-13-2012, 10:39 AM   #1
thatirishguy
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Default Another Overheating thread

Coming home from work the other night my car overheats big time. I pop the hood and there's coolant everywhere. So I had the car towed home and started looking for the leak over the weekend. Upper rad hose had a good size hole in it so I replaced that and didn't see any other culprits for coolant leaks. Now within 2 miles of the driveway, the temp gauge skyrockets and stays there. Did the thermostat get cooked during the overheating? Odd thing is my heat is still working properly. Excuse me if any of these are dumb questions, stills noob with Subys.
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Old 11-13-2012, 11:37 AM   #2
RickRick
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How much coolant was lost? If more than a quart or two, did you refill the neck? Not the overflow. If so, when the car is warming up squeeze the upper radiator hose to burp the coolant back three the system and run your heat to get the coolant threw the heater core. There most likely air in your lines.
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Old 11-13-2012, 02:33 PM   #3
Mishimoto
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Quote:
Originally Posted by RickRick View Post
How much coolant was lost? If more than a quart or two, did you refill the neck? Not the overflow. If so, when the car is warming up squeeze the upper radiator hose to burp the coolant back three the system and run your heat to get the coolant threw the heater core. There most likely air in your lines.
Definitely could be air in the system. Try purging the air, filling fully with coolant and let us know how it works out.
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Old 11-13-2012, 02:50 PM   #4
thatirishguy
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2002 WRX
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Default

Quote:
Originally Posted by RickRick View Post
How much coolant was lost? If more than a quart or two, did you refill the neck? Not the overflow. If so, when the car is warming up squeeze the upper radiator hose to burp the coolant back three the system and run your heat to get the coolant threw the heater core. There most likely air in your lines.
Quite a bit was lost, what do you mean by "the neck." I'll try burping the system when I get home this afternoon. Thank for the help guys!
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Old 11-13-2012, 03:45 PM   #5
Concillian
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Air in the system is a very, very, very common problem with these cars. The way the system is setup, it's difficult to get all the air out.

You need to let the car run with the coolant system open until it's fully warm. In order to do this without getting coolant everywhere, you need a funnel that can sit with smooth walls against the fill location in the upper reservoir.

The issue is that a whole leg of the coolant system is fed by a pipe that comes out the top of that upper reservoir. You must get the coolant level over the top of that pipe, and that only happens readily by using a funnel. You can half-ass it by squeezing the upper hose and "pushing" some coolant into that area a little at a time, but it's easier to just set up a funnel and let it idle for 20 minutes while you watch TV or whatever.

Alternately you can pull the hose off that pipe, it's the S-shaped hose that goes to the turbo. Fill through that hose and you will get rid of most of your problem.
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Old 11-13-2012, 04:42 PM   #6
RickRick
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Quote:
Originally Posted by Mishimoto

Definitely could be air in the system. Try purging the air, filling fully with coolant and let us know how it works out.
I just bought and installed a mishimoto radiator this week it's great! I had the same coolant issues after the install haha
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Old 11-13-2012, 04:47 PM   #7
thatirishguy
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Quote:
Originally Posted by Concillian View Post
Air in the system is a very, very, very common problem with these cars. The way the system is setup, it's difficult to get all the air out.

You need to let the car run with the coolant system open until it's fully warm. In order to do this without getting coolant everywhere, you need a funnel that can sit with smooth walls against the fill location in the upper reservoir.

The issue is that a whole leg of the coolant system is fed by a pipe that comes out the top of that upper reservoir. You must get the coolant level over the top of that pipe, and that only happens readily by using a funnel. You can half-ass it by squeezing the upper hose and "pushing" some coolant into that area a little at a time, but it's easier to just set up a funnel and let it idle for 20 minutes while you watch TV or whatever.

Alternately you can pull the hose off that pipe, it's the S-shaped hose that goes to the turbo. Fill through that hose and you will get rid of most of your problem.
Just pop the cap on the upper reservoir place a funnel in and let the car idle for a bit? Thanks again guys
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Old 11-13-2012, 04:48 PM   #8
RickRick
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Quote:
Originally Posted by thatirishguy

Quite a bit was lost, what do you mean by "the neck." I'll try burping the system when I get home this afternoon. Thank for the help guys!
The neck is where you put the coolant into the reservoir. It should be filled up to about an inch bellow your rad cap . It may appear to be full... But coolant as said above needs to get pushed threw the system and using a funnel works the best. I just did this last week by filling the reservoir and continuing to squeeze my hoses til the coolant level no longer went down. I don't know what vehicle you have but my 2003 Wrx takes about 7.7 qts . If your messing with the coolant, you might as well drain all of it and re fill while your under the hood anyway.
Be sure your rad cap is on correctly to.
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Old 11-13-2012, 05:44 PM   #9
Concillian
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Quote:
Originally Posted by thatirishguy View Post
Just pop the cap on the upper reservoir place a funnel in and let the car idle for a bit? Thanks again guys
Yes, that's it.

It will take 10+ minutes for the coolant level to rise enough that you don't have to hold the funnel.

Obviously when you're done, the coolant level is over the cap level, so you need to drain some out with a siphon. I usually run that siphon to the overflow tank by the driver's headlight to bring the coolant level back down to a level I can put the cap on.
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Old 11-15-2012, 11:59 AM   #10
thatirishguy
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This fixed my issue! thanks for all the help guys.
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Old 11-15-2012, 01:00 PM   #11
Mishimoto
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This fixed my issue! thanks for all the help guys.
Good deal!
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