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Old 11-12-2009, 11:30 AM
Buz Buz is offline
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Question Coolant leak rear 2.2 Engine

I am new to the forum and a barnyard mech, I recently acquired a Chevy
S10 1/2 Ton PU it has a 2.2 Engine it leaks coolant when I turn on the heater on and its coming out the rear of the head, I took off the intake manifold and no leaks there.The heater core looks fine. The guy said they put a new rebuilt engine it 25000 miles ago but I kind of doubt that,s my opnion. What is that cover on the rear of the head 6 bolt pattern, looking on the rear of head facing forward there is a round hole on the right conor next to that going left is a small sq hole and still looking left there is a rectangular box standing up , what are those passage?

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Buz
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Old 11-12-2009, 12:26 PM
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Default 2.2 Block

Attachment 550

Last edited by Buz; 09-23-2012 at 10:25 PM.
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Old 11-12-2009, 05:21 PM
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If those holes aren open you will leak coolant as soon as the thermostat opens or sooner. Mine has a blockoff plate on it. Turn the heater on and see where it comes from.
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Old 11-12-2009, 08:16 PM
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Hi Carl
I found the leak and it was in the rear of the head The two port holes to the lower right corner in the picture.It goes to the EGR valve. Thanks for your input. I ordered a gasket chevy part #10192504 I talked to the chevy dealer when all else fails duh it's called a water outlet adapter cover. Does any know should I use sealent on the gasket when instaling it and what is the operation of the port holes?

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Buz
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Old 11-13-2009, 06:38 PM
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if the motor is in the truck i'd reccomend it with the angle you'll be working with, just some extra protection.
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Old 11-13-2009, 09:32 PM
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Hi Carl
Apparantly they did put a remanufactured engine in the truck as the first engine burned up. The old EGR water adapter cover outlet had a dish shape to it. I took it to my machinest friend and had it remilled, it was out about
10,000 , I know it does sound like much but was enough over time to compromise the gasket with heating and cooling. I got most of it back together today. Finish tommrow .

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Buz
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Old 11-13-2009, 10:50 PM
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.010 is enough to cause a leak over time......which is why most heads have a .002-.007 warp limit.
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Old 11-14-2009, 08:37 PM
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Hi Carl
Your right on there, got the job finished today and NO LEAKS

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Buz
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Old 11-21-2009, 04:14 PM
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I hate to say it but your right I found another leak coming from it and looks like from the top of the bell housing. When I turn the heater on, it leaks.
There is no antifreeze smell inside the cab. It's got to be the heater core, at this point I really don't know any help would be appreciated. The part I fixed no longer leaks
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Old 11-21-2009, 05:11 PM
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It could be a heater core hose, just turn it on and watch where from. Thats about all you can do.
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