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Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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i just put new head gaskets on this '91 chevy 6.2l and now its leaking coolant from the back driver side of the block. where could the coolant be coming from.... JOIN NOW TO REMOVE TRACER

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Old 03-02-2013, 10:23 AM
scrappiron68's Avatar
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Default 1991 6.2l coolant leak

i just put new head gaskets on this '91 chevy 6.2l and now its leaking coolant from the back driver side of the block. where could the coolant be coming from.
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Old 03-02-2013, 04:52 PM
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The rear of the heads have coolant passage coverplates-could be leaking from one of them or their studs?
Glow relay is often mounted to a rear stud in that area and would have needed some pipe sealer when re-installed.
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Old 03-03-2013, 09:43 PM
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My 6.5 leaked from the block heater, caused by it shorting out. When I put a lower hose heater on it, I used some of that Bars stop leak powder and it doesn't leak antifreeze now, motor oil and power steering completely different story however. Might try it, its 1.62 at walmart, but you need about 3-4 bars of it, but it worked pretty good. If its a big leak, might not try it.

MontanaTechPetroleum's Sig:1996 Chevy C2500, 5 spd, 3:73 gears, manual glow plug override, Bosch 80034 glow plugs, S&B Cold Air Intake
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Old 03-06-2013, 10:58 PM
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guy who worked on it after i left didn't tighten the cover plates. all good
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