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Old 04-28-2012, 07:05 PM   #1
skeletorr
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Default 07 wrx overheating for the hundreth time

I have an 07 wrx with vf39 supporting mods proper tune ect ect at 111k miles. Im running a bigger radiator and my car has been eating thru thermostats. I want to say ive gone through 5 thermostats in 11k miles. 2 autozone garbage ones and 3 oem subaru ones. Ive done my water pump and timing belt at 100k. My car started overheating yesterday, coolant is full, my thermostat has maybe 2-3k miles on it and theres no coolant coming out of the exhaust or leaking. This is making me believe its another thermostat. After it overheated, i let it cool down and then started it up. It went to operating temp sat there a minute and then started overheating quickly. Every coolant system piece has been replaced except the temperature sensor and the resivoir cap. In this situation nothings leaking so its gotta be the thermostat again or maybe the temp sensor? If it is the thermostat, why is my car killing thermostats every couple thousand miles.
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Old 04-28-2012, 08:42 PM   #2
scarney1988
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Couple of questions so that we can help you
  1. Do your cooling fans turn on? (if not turn on your blower motor and AC switch to on and see if they work)
  2. How did you refill with coolant when you did timing belt and 5 subsequent thermostats?
  3. Can you verify the temperature (IR Thermometer reading)?
  4. Any possibility of swapping the factory radiator back in?
  5. Does replacing the thermostat seem to fix the problem?
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Old 04-29-2012, 05:54 AM   #3
renhoek
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Why do you think the thermostats are failing? Do you test them to check them, or do you just assume they failed because the engine gets hot and it's the only thing you can think of...

Are you bleeding all the air out of the cooling system properly after you drop the coolant? At the moment, based on what you have told us, my bet is an inadequately bled cooling system.

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Old 04-29-2012, 11:42 AM   #4
z
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Quote:
Originally Posted by renhoek View Post
Why do you think the thermostats are failing? Do you test them to check them, or do you just assume they failed because the engine gets hot and it's the only thing you can think of...

Are you bleeding all the air out of the cooling system properly after you drop the coolant? At the moment, based on what you have told us, my bet is an inadequately bled cooling system.

This was going to be my exact response. Thank you for typing it out for me.
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Old 04-30-2012, 01:18 PM   #5
skeletorr
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System is properly bleed every time there is no air or leaks in the system, my coolant is full. My car s fans turn on and off what seems like properly. Its not that simple of a problem. When i replace the thermostat under these circumstances it fixes the problem. But after 2k miles they break. Is there some other part of the system known to cause a problem like this?
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Old 04-30-2012, 01:41 PM   #6
Thunderpaw
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Could take one of your old thermostats if you still have one put in pan of water and start boiling it. It should pop open. Could use a cooking thermometer to check temp. They're pretty simple devices. And if car is idling and reaches operating temp. the fans turn on? How did you check that they turned on? (a/c off)
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Old 05-01-2012, 08:17 AM   #7
scarney1988
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I guess everyone is perplexed cause the cooling system is possibly the most simple system in the powertrain system. I am sure your frustrated but there has to be something simple thats been missed.

How do you know the air is bleed out properly?

when bleeding coolant on a new vehicle I recommend the use of a vacuum operated coolant fill device or a Lisle Coolant Funnel. You essentially fill the funnel up until coolant backs up into funnel, turn car on and top off funnel as coolant funnel empties into the system. When fans come on and no more bubbles are coming up, you must be good.

2. Test a thermostat like on of the other users suggested, that way you will know if they are actually bad.

3. When was your rad cap last replaced (when you engine is cold, are your hoses flat or round?

4. Does your car make any noises when its turned off, like suction noises or anything (sounds stupid but you'll know it if you hear it)?

I guess what confusing is your symptoms are generally combined with loss of coolant over time. Repetitious thermostat failure just doesnt seem probable even at autozone parts failrates. When I first read your post my first thought was, the coolant was not bled properly after TB/WP and the head gasket popped (not going to say its common but certainly not the first time). I hope that this does not turn out to be the case, but honestly from my experience all odd coolant system behavior problems that can't be cured by what you have go that way. Keep checking stuff and you'll get something.

G'luck
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Old 05-02-2012, 04:17 AM   #8
renhoek
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Quote:
Originally Posted by skeletorr View Post
System is properly bleed every time there is no air or leaks in the system, my coolant is full. My car s fans turn on and off what seems like properly. Its not that simple of a problem. When i replace the thermostat under these circumstances it fixes the problem. But after 2k miles they break. Is there some other part of the system known to cause a problem like this?
Please explain how you know the thermostat is "broken". Have each "broken" in the same way?

No answers yet, just more questions as we all try to figure out what is going on here.
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Old 05-02-2012, 01:33 PM   #9
skeletorr
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i dont know if the thermostats are actually "broken" i get this problem and i change the thermostat first and its solves the problem for a few thousand miles. the system is properly bled i have a coolant exchange tool that fills the system and bleeds the air. i work with a friend of mine that is an experienced mechanic on each replace, i highly doubt that is the problem. also this problem happened at 109k i replaced the thermostat and had no issues at all until 111k, which is where im at currently. im starting to think its something with the motor (headgasket, cracked head.) something of that sort but i need more proof before i go with that. im not losing coolant at all really though, so if my head gasket was bad, can it cause some of the problems im having without leaking/burning coolant? in the next few days if everything works out i might be bringing the car to efi logics, im sure they will be able to fix it.
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Old 05-02-2012, 08:34 PM   #10
scarney1988
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Head gasket possibilities and symptoms
  1. coolant jacket -> oil passage - Oil soupy brown, coolant f'ed up looking. Coolant lost
  2. coolant jacket -> comb. chamber- coolant sucked in during intake stroke and burned. System produces copious amounts of bubbles when full with the above mentioned funnel and running.
  3. coolant jacket -> exterior block - Coolant leaks outside of head and runs down block. Coolant lost.
Cracked Coolant passage in Head/manifold/turbo?
  1. head -> intake side = Coolant continously sucked into engine while engine operating. I imagine the effect is enhanced on a turbo car, but not sure. Coolant lost.
  2. head -> exhaust = coolant continously sucked out of coolant into exhaust. Coolant lost.
  3. manifolds -> They leak coolant into their related system. Coolant lost.
  4. I imagine a coolant cooled turbo housing could potentially crack and allow coolant into exhaust, but I do not have any real experience dealing with turbos (Toyota doesn't use too many, and I dont like'em lol)
I just keep thinking in my head your losing coolant slowly over time (im guessing from head gasket), then you fix the problem by replacing thermostat, refilling and bleeding the system out. I am trying my best to help man. Wish I was there, I'de dive in but tough to diag over the keyboard.

I would really recommend driving the thing local to your house until you duplicate the problem. Then bring it home and let it cool completely (atleast and hour) should give you a true reading on coolant lvl. Doing anything else is gonna cause pressure to launch coolant out and introduce all kinds of unknowns. Also you could fill it up completely cold, then pressure test it. Also, drain it completely and vacuum test it (if your friends bleeder will allow it since some are universal and not equipped for the task).

Good luck
Sean
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