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Old 08-12-2003, 10:22 PM   #1
DDMan
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Default Overheating Probs.

Alright...well, 20,000 miles and my car is already overheating. I seem to get the luck...Pretty much every car I drive overheats somehow. If Im in stop and go driving for more than 10 mins, with or WITHOUT the A/C, in any temps over 85 degrees...the coolant temp starts to rise It only happens in stop and go driving, and has EVEN happend on an overcast morning (8am) when it was only like 70 degrees outside (luckily it did plummit within 30 sec after I got up to 45mph.

I have checked the coolant, radiator, overflow, (when cold)and hoses, and everythign seems alright. What else could it be?
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Old 08-13-2003, 02:59 AM   #2
atmosphere
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Could be a number of things... bad thermostat, blockage in the cooling system, maybe a leak some where, even worse it could be a cracked block or a blown headgasket although I highly doubt these. Any blockage will be removed with a radiator flush, the thermo will cost some money to have replaced. For future reference post something of this nature in the service forum you'll get better info and feedback.
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Old 08-13-2003, 03:24 AM   #3
Subietonic
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Concur with atmosphere's assessment. If those checks prove negative, I would add a coolant sniff test (for exhaust gases) just to be on the safe side or, if that's not available, at minimum a pressure leak down test. You're running a Phase II block and the head gaskets typically tend to go externally but I've also seen a few where they leak between the No. 1 and No. 3 cylinders (pushes hot exhaust into the cooling jacket) and causes overheating at idle/in traffic and eventually all the time.

Did you recently drain and replace your coolant, or have it done? If the engine block plugs weren't pulled, and the coolant refill wasn't done properly (bled out of the top), it's possible that there's air trapped in the engine's coolant jacket and that will give you hot spots (not good), blocked coolant flow (definitely not good) and potential for cracked head gaskets and/or cracked blocks/heads (way worse). Just thought I'd add the part about the coolant refresh because I've seen this before too.

Keep us appraised and definitely get it into your dealer for an assessment/noted on your work order.

Br, Dale
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Old 08-13-2003, 11:18 AM   #4
DDMan
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Ah...ya. I know it can be lots of things (from previous experience ) but I wasnt sure if I was missing anything I personally could do.

I havnt replaced any rad. fluid or added anythign. Its all as the car origionally came (just checked to make sure I wasnt low or anything).

Guess ill take it to the dealer and see if they can dulpicate it.


Edit: I also just throught about something. The fans may not be kicking on at the right temp. that would definately cause overheating in low speeds (but not idle).

Last edited by DDMan; 08-13-2003 at 11:53 AM.
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Old 08-13-2003, 02:03 PM   #5
Subietonic
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Fan kick-on is a critical piece of your cooling system as you have identified. The thermostatic switch that controls the fans could be bad, or it could be a fuse/relay problem or even a loose connection. I'm sorry for not mentioning that, it's just that these fan parts are like energizer bunnies, they just keep on running with little or no problems.

Do the fans come on when you turn on your A/C? If so, at least you know your fans are working. Do the fans come on after you've driven the car and come to a stop/idle? They typically do, especially during the summer months and they should if you are sitting in traffic at idle or crawling along in traffic. As atmosphere mentioned the thermostat could be sticking closed but that should cause the fans to come on and stay on, at least typically they would. You many be on to the idea that cracks your cooling nut!

Let us know what you find out from the dealer.

Br, Dale
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Old 08-13-2003, 03:58 PM   #6
maciek
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check your fan fuse....I blew mine twice already

Only overheats under 30 mph or so
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Old 08-13-2003, 07:05 PM   #7
DDMan
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Well...just checked, and while sitting in my garage I turned on the A/C and the fans immediately kicked on...so the fans work.
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Old 08-13-2003, 09:33 PM   #8
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Do you have any mods relate to the ECU? Like any computer chips-ProECM, torque chip etc...
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Old 08-13-2003, 11:17 PM   #9
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Back when I used to drive Fords it seemed like every other thermostat I put in was crap, and the car would overheat. When I got to California, and had two bad thermostats in a row, I just took the thermostat out entirely -- it's warm enough here that a car runs ok without it.

I'm not sure I'd recommend that, but you could try running without it for a while and see if the problem goes away. Or just put in a new one -- I don't know about this car yet, but they are usually cheap and easy to replace.
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Old 08-13-2003, 11:35 PM   #10
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20,000 miles...Your car is still under warranty. Let the Subaru Tech's worry about fixing it.
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Old 08-14-2003, 02:16 AM   #11
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Quote:
Originally posted by kasio
Do you have any mods relate to the ECU? Like any computer chips-ProECM, torque chip etc...
Yes he does, im telling him to pull it now
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Old 08-14-2003, 10:41 AM   #12
Subietonic
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Quote:
Originally posted by DDMan
Well...just checked, and while sitting in my garage I turned on the A/C and the fans immediately kicked on...so the fans work.
That's good. Now, does the thermoswitch at the radiator, turn them on. That's the next question.

And... ECU mods can have a tendency to override things..., temp sensors, etc.

Like it was said above, let the dealer sort it out.

Br, Dale
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Old 08-15-2003, 11:18 AM   #13
DDMan
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Tested the thermostatic switch...and it seems to work too

Although, it seems like it took ALOT to get them to kick on. I had the car idling for 5 mins (after I got home, so the car was already warm)...and the fans still didnt kick on. I revved the engine to 1500 RPM and held it there. Finally the fans kicked on, but the temp gauge never moved an inch (it would normally creep up).

So it seems like the cooling system is too good...but it still overheats.
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Old 08-15-2003, 01:21 PM   #14
Subietonic
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Okay - all of that said...by overheat you mean the temp gauge goes up into the "red" area and/or the radiator overflow starts to burble with escaping, steaming fluid, or just that the temp gauge goes up? If you're getting boil over or in the "red" zone on the indicator gauge, then it sounds like you've got a head gasket and/or cracked block problem. It's been known to happen even at <20K miles.

BTW - Do you have a manual or an automatic? If it's an auto, then that could be a contributing factor, especially if the fluid is low.

HTH.

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Old 08-18-2003, 11:22 AM   #15
DDMan
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By overheat I mean go over the "middle" range. I have never had it boil over or go into the red....nor will I ever let it. I've had too many cars that once they start going up, they dont stop unless you either get up to speed quick or stop the car immediately.

Im going to Rancho Cordova Tues...Ill see if it overheats then.
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