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Old 05-09-2008, 07:26 PM   #31
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Join Date: Apr 2008
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Location: Houston, TX
What I Drive: 2003 SVT ZX5

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Originally Posted by brawls43 View Post
If you can see what color yours has, add the same type, green or possibly yellow. Do not use the orange DexCool for GMs.

Sidenote: The proper size O-ring to use is actually a METRIC o-ring. Remember that Ford converted all its cars to Metric, not to mention the Focus was originally designed in Europe, where metric is the standard. After reading some people used #203 and some used #202, I checked into the metric's and there happens to be a standard metric size right between a #202 and #203. Its a 7mm ID, 13mm OD, 3mm cross-section. I got mine in Viton and of course have some left over. It went back in easily and haven't had a leak since. If you need one, PM me and I'll drop one in the snail mail for you.

Sorry, I'm now out of the o-rings I bought, they can be ordered from places like McMasterCarr.

I just did this, and ordered the metric oring from mcmastercarr. I looked around at all the local automotive parts shops, even a few 'specialty' shops that I was told might have metric o-rings, with no luck.
After getting the o-rings, I switched mine out in about 10 minutes. The metric o-ring fits really well without having to force it. about 1/2 gallon of coolant comes out, but it's a fairly quick switch.
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