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Old 11-11-2008, 01:43 PM
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loosing coolant ?

1999 Blazer, 4.6, auto, 2wd, loosing coolant over a out 100 miles. No leaks visual. When I let it run on the driveway until it got good and warm, there were no leaks to be seen, except the exhaust pipe. I didn't check it until I happen to walk around the back, and it was dripping water out the tail pipe. 1 drop every 7 seconds with the engine running. I had a friend that has problems with a chevy truck leaking head gaskets, he said it was a problem from chevy using bad head gaskets. He had them replaced with a better after market and hasn't had any problems seen. Has anyone had this problem with a v6, I think his was a 305. thanks

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Old 11-11-2008, 02:08 PM
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I know the 5.7 had ****ty intake gaskets and I had to replace mine at about 100k in a 97 Tahoe
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Old 11-11-2008, 02:19 PM
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The water dripping out the tailpipe is normal condensation. It should go away after a while when the exhaust tubing gets hot. If you are getting a sweet-smelling steam from the exhaust, then I'd worry.

The 4.3 V6 is basically a small block chevy minus two cylinders, so its possible that the same problems would plague them both, however, the problem wasn't with the head gaskets, it was the intake gaskets. The driver's side rear water passage would leak sometimes. Its just a matter of replacing the gaskets with a good aftermarket set.
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Old 11-11-2008, 02:45 PM
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Intake manifold gaskets leak on the 4.3 as well , usually under the a/c compressor where you can't see it
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Old 11-11-2008, 05:53 PM
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Check the oil dip stick. Those intakes are famous for leaking into the engine. If the oil looks milky at all, get it fixed or you will destroy the bearings if you havent already. It is a fairly easy intake job except the fuel lines, they can be a real pain.

Chet
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Old 11-11-2008, 07:58 PM
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Can you smell coolant under the hood? You may want to look for a trace along the block or water pump. Sometimes when a leak first starts the coolant will burn off on the side of the block or water pump as it trickles out and never reach the ground. As the leak gets worse the coolant will end up on the ground.
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Old 11-11-2008, 09:18 PM
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Radiator

I don't know if they do this any longer or not but you used to be able to go to a Radiator repair shop and they had some chemical they put into this device, they remove your radiator cap and use this to sniff out any exhaust in water, meaning a possible leaking head gasket.

The water has to be going some place.
HJ

Last edited by 88lowrider; 11-11-2008 at 09:25 PM. Reason: grammer
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Old 11-12-2008, 04:32 AM
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I have that tool at my garage. I think you can still buy them from Snap On or Mac. The liquid in the tester is blue but changes color in the presence of combustion gases. If I remember correctly it's looking for CO2. I've found it to be 100% accurate and invaluable when determining if there's coolant getting into the combustion chamber. Btw, if you change the coolant regularly you'll avoid a lot of the head gasket and intake gasket problems.
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Old 11-12-2008, 08:15 PM
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safe to assume there is no pressure tester available ?
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