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Old 08-09-2006, 03:28 PM   #1
horrorbiz
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Member#: 77290
Join Date: Dec 2004
Chapter/Region: NESIC
Location: Oxford, MA
Vehicle:
13 SSM BRZ
06 Impreza 2.5i

Default Coolant, pressure test question

So I have been really busy lately, and ended up having to just drop my car off this morning for a late oil change. I got a call from them, saying that my coolant was pretty low. They recommended that they do a pressure test—I said go for it.

They said it held fine and didn't find any leaks.
So..my question is, why was it so low? Where did it go? Is this normal?

Background info: I had my headgaskets replaced about 3-4 months ago.
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Old 08-10-2006, 12:27 PM   #2
solbey11
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Any fluid overtime will start to evaporate. So it is normal to lose some coolant over a period of time and not have a leak. But since you stated the head gaskets were replaced, there is a possiblity that some air was left in the cooling system after the work was performed. Over that 3-4 months, that air could have worked itself out of the system and coolant from the overflow bottle would be sucked back into the engine. As long as they topped the coolant level off, you should be fine. Just keep an eye on it for the time being. I'd say once a week just check the level and mark it down somewhere. If you do notice the level is dropping rapidly, let your shop know and show them your notes on the level over time. That may help them find a problem if one exists.

The other thing you may want to ask them about is if they checked the cooling system when the engine was hot or cold. When the engine is hot, the metal expands and will close small gaps that could leak coolant. If the engine was cold, those gaps will appear and a pressure test should show if there are any leaks in the system. I work at a Cadillac/Subaru dealership and we have seen this issue on Cadillacs. If the engine is hot, a pressure test will come up "negative". Once the engine cools down to air temperature, leaks will present themselves and the pressure test will come up "positive".

Hopet that helps you out some.
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Old 08-10-2006, 12:42 PM   #3
horrorbiz
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Join Date: Dec 2004
Chapter/Region: NESIC
Location: Oxford, MA
Vehicle:
13 SSM BRZ
06 Impreza 2.5i

Default

Hey thanks for the help! The car sat for a few hours before the test was done so it should have been cold. I'll keep my eye on it for now.
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