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Old 02-01-2020, 10:47 PM   #1
Alice
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Quick question and Iíll leave ya all alone.

1995 6.5L diesel, long time member here, had it since new. Gave my son that suburban. Today he says itís drinking the coolant, 3L at a time, starting today. Coolant low light keeps coming back on, itís down each time. Didnít dump on the ground, didnít dump on the floor mat, no white smoke.... whereís it going?
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Old 02-02-2020, 12:43 PM   #2
Blue Bowtie
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Re: Quick question and Iíll leave ya all alone.

You seem to have covered the bases - It's not leaking externally. Is this a dual-heat truck? If so, start looking at the floor and drain openings in the passenger footwell and the rear cargo area.

Just to be sure, check the transmission oil level and condition. You probably see where that is going. If that is all correct, and the engine oil is also not contaminated or overfilled, that only leaves the exhaust system as the exit path for all that coolant.

If it isn't leaking in the vehicle, that only leaves internal system leaks. As you indicated, those are susually evidenced by vapor/white smoke - Usually. A diesel can be a little different.
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