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Join Date: Jul 2001
Location: wichita, KS, 67209
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how do you add coolant?

Hey, I am trying to add some coolant to my 928s. I can not get any room to remove a cap or put it in. Any advice?
Old 03-10-2002, 08:49 AM
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Location: Brighton UK since 11/2012
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928 coolant tank caps are difficult to undo, but use a pair of grips and you should be able to release it. Obviously make sure the engine is cold when you do this. Check the cap and renew it if the rubber washer is perished. Use only the proper BEHR cap, US caps have the wrong pressure.
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Old 03-10-2002, 10:25 AM
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"US caps have the wrong pressure"

I don't quite understand this statement?

???

-Wayne
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Old 03-10-2002, 12:17 PM
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Sorry Wayne, I should have been clearer. Porsche run the cooling system at a higher pressure than most US cars; therefore if you fit a pressure cap from the local auto-parts store it will allow coolant to leak out due to the opening pressure being too low.
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2001-2012 Gerber Motorsport Inc. 206-352-6911
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Old 03-11-2002, 07:33 AM
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Coolant pressure? Do you mean that the cap (which is sometimes designed be pressure relief?) would break at a different pressure?

-Wayne
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Old 03-11-2002, 11:36 AM
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Yes, the pressure that the cap operates at is higher for Porsche models than most domestic cars.
Usual auto-parts cap pressure; 7 - 10 psi
Porsche 15-20 psi
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2001-2012 Gerber Motorsport Inc. 206-352-6911
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Old 03-11-2002, 11:55 AM
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How interesting.. I never noticed that.. great info.
Old 03-19-2002, 08:54 PM
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Hello

Most Mercedes use a similar cap.

Grüsse
Old 03-26-2002, 04:36 PM
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Old 03-26-2002, 04:36 PM
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