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Old 05-01-2016, 05:10 PM   #1
IPassedYou
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Default 08 sti no heat

Today my 08 sti decided that it didn't want to have any heat and when it did come it was only for a couple minutes than it went away. The temperature gauge slowly gets to the normal mark but even when it's at normal it doesn't get heat.

The car threw a P0128 code I popped the hood and noticed the expansion tank is completely full so I believe I can eliminate a stuck open thermostat.

Any suggestions would be greatly appreciated
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Old 05-01-2016, 06:16 PM   #2
TakesTheBus
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i doubt that there is air in the system or else your temp would be high. Shot heater core maybe? Even that seems rare, ive seen it only twice
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Old 05-01-2016, 07:59 PM   #3
IPassedYou
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Originally Posted by TakesTheBus View Post
i doubt that there is air in the system or else your temp would be high. Shot heater core maybe? Even that seems rare, ive seen it only twice
For safe measures I bled the system now I have heat but only if I am moving if I stop it goes cold. The code is still there on top of a new one p0457.
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Old 05-02-2016, 01:15 PM   #4
CosmoTheCat
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Well there are only a couple of reasons that the expansion tank would be full - blown head gaskets and a failing radiator cap being among the most common.
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Old 05-02-2016, 03:20 PM   #5
Eitri
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Sounds very much like the blown HG I had in my 2012 STi.
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Old 05-02-2016, 03:24 PM   #6
Max Capacity
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You can find a repair shop with a HC tester and have them test for hydrocarbons in the coolant system.
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Old 05-03-2016, 05:12 PM   #7
IPassedYou
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Originally Posted by CosmoTheCat View Post
Well there are only a couple of reasons that the expansion tank would be full - blown head gaskets and a failing radiator cap being among the most common.
The expansion tank hasn't over filled since I bled the system but I am still getting the code for the system not getting up to temperature. I'll look into buying a new radiator cap this week.
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Old 05-03-2016, 09:08 PM   #8
Davidbag001
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Pull out your thermostat it is probably part of the way stuck open.
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Old 05-04-2016, 10:50 PM   #9
CosmoTheCat
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I'm curious as to why the coolant pushed out - it's possible for the cap to be bad, allow excess pressure to push coolant out but not allow it to return when the system cools off.

That won't explain why you're not heating up though. A stuck open thermostat would, but that wouldn't explain the coolant.

You may have a couple of things going on.

If the coolant isn't getting hot, replace your thermostat. If the coolant IS getting hot, but you're not blowing hot air inside, check both heater hoses at the bulkhead to make sure they're both hot. If they are, you probably have a blend door issue.
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Old 05-05-2016, 12:24 AM   #10
Davidbag001
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The key to this is the p0128 I have seen this one different makes and models. A lot of the time the time the thermostat is broken and is stuck partially open that will explain the pushing coolant due to restricted flow and slow warm up
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