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Old 08-13-2000, 10:59 PM
Benzmac Benzmac is offline
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
There is a tool sold by NAPA for this...It goes in the place of the reservoir cap. You run the engine and if the blue liquid turns yellow, you have a combustion leak into the coolant system.

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
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