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Old 24-10-2009, 04:46 PM   #1
Beer Baron
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Default AU thermostat housing leak.
Hey Hey,

I put on a serpentine belt cover the other day and since i replaced the bolt with the stud i cant stop it from leaking. Ive replaced the o ring and it still leaked. Replaced the o ring again and sanded both surfaces till they were dead smooth, I even checked it with feeler gauges and its perfect.

Why does it still leak ?

It gets wet where the top housing meets the lower housing then drips onto the ac pump.

Suggestions ?

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Old 24-10-2009, 05:19 PM   #2
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use some permatex form a gasket in between the two surfaces that are leaking.
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Old 24-10-2009, 06:04 PM   #3
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I didn't want to use goo but i did put some on anyway, I'm going to let it cure over night and test it then.
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Old 24-10-2009, 06:04 PM   #4
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also, how much tension have you got on the thermostat housing now that you are using the stud?
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Old 24-10-2009, 06:05 PM   #5
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Originally Posted by rag top
also, how much tension have you got on the thermostat housing now that you are using the stud?
I don't have a specific torque but i didn't want to go any tighter in alloy. Its not so tight now that it has been goo'd
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Old 28-10-2009, 05:20 PM   #6
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All sorted???
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Old 28-10-2009, 07:53 PM   #7
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All sorted???
So far so good, I'm checking it daily. Paranoia sucks.
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Old 01-11-2009, 02:30 PM   #8
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Originally Posted by Beer Baron
So far so good, I'm checking it daily. Paranoia sucks.
Started leaking from the stud yesterday. Regoo'd the entire housing and studs again and let it set for longer before starting it. Seems to have worked but i will check during the week periodically.
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Old 28-10-2009, 05:23 PM   #9
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gasket goooo is your friend
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Old 01-11-2009, 06:11 PM   #10
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is the housing cracked? (micro crack which expands when hot)
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Old 01-11-2009, 06:23 PM   #11
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is the housing cracked? (micro crack which expands when hot)
I thought that too but the leak is moving around the housing, It was leaking between the mating surfaces, then from the stud. Now it seems to be good but this week will tell as i will rack up close to 700km. I always keep a bottle of coolant in my car so i should be right and its just a tiny leak, I check it daily too.
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Old 02-11-2009, 12:02 AM   #12
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i usually get a bit of sand paper on a piece of glass or whatever i can find thats uniform with some 100 grade and give the face a bit of tickle up just to make sure its a flat surface.
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