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Rocks in thermostat housing?

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Old 03-10-11, 12:29 AM
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89FC
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Rocks in thermostat housing?

s5 GXL, 120k miles, 5speed.

So maybe not rocks per say but pretty damn close. I'm thinking there calcium build up. I've been running strait water for a few weeks now while trying to figure out if I have a water leak or blown coolant seals. Found my water neck cracked and removed the rad hose to see how bad it was when I found this. Any ideas?
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Old 03-10-11, 04:18 AM
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Yup... Mineral deposits or electrolysis...

What's your radiator made of?
Is the radiator grounded to the chassis of the car?
Tap or distilled water?
Old 03-10-11, 11:38 AM
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Rad is Brass.
I believe so, but I'll double check.
Tap water.

Radiator was recently replaced with a used Brass unit.
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Old 03-10-11, 01:09 PM
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Mineral deposits. You need to run distilled or ro/di water.
Old 03-10-11, 03:06 PM
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89FC
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Thanks guys.

Just put a bid on this, anyone else buy one off this dude? If so hows the quality?
http://cgi.ebay.com/ebaymotors/1989-...Q5fAccessories
Old 03-10-11, 05:31 PM
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I am using this....

http://www.mazdatrix.com/getprice.as...m=15-1720-ALUM

Works great. A bit more than the ebay unit, but I'd damn sure trust mazdatrix more.
Old 03-10-11, 05:56 PM
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^Mazdatrix probably sells the one this dude makes lol

Last edited by -Crash-; 03-10-11 at 06:08 PM. Reason: eh?
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