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  #1  
Old 04-09-2010, 09:00 AM
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Question antifreeze leak on top of motor

My 96' 4x4 v-6 vortec engine has just starting leaking antifreeze there isnt any on the ground but i smell it and when i look for the leak there is antifreeze laying on top of the engine. I havent been having an overheating problem, the heat works and i dont smell antifreeze inside the vehicle. Now today When i turn it off the engine starts smoking and the temperature goes up but as soon as i turn it back on the temperature goes down and the smoking stops. Please if anyone has any idea water pump? thermostate? head gasket? heater core? im at a total loss. Thanks in advance.
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Old 04-09-2010, 11:44 AM
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Upper radiator hose leak/connection, thermostat gasket leak, intake manifold gasket leak. One of those.
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Old 04-09-2010, 03:16 PM
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Thermostat is a good place to check I just had that issue, I replaced it while I was in there and leak stopped, but could also be a hose and any of before mentioned things, good luck.
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Old 04-09-2010, 04:09 PM
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150k is the limit for the intake manifold. Mine on my 1998 went at 152k. I was driving (January in New England), and lost my heat. Then, my truck was overheating. I got the smell of anti-freeze in the cab, so I pulled over and popped the hood. I swear, it was peeing out of the top of my engine, near the throttle body, where it was pooling. I noticed a loss of antifreeze before, and had the smell, but ignored it for the time being, contributing it to a hose leak. BIG (and expensive) MISTAKE!!! Cracked my engine block in the process...
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Old 05-20-2010, 05:26 PM
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Does coolant go thru intake manifolds? Would it leak from intake gaskets?
thanks.
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Old 05-20-2010, 07:48 PM
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Yes, it could like seen in this video.

http://www.youtube.com/watch?v=BI2FH6034sQ
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Old 05-20-2010, 10:43 PM
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is it common on blazer/s10 98? which one will leak upper or lower?
mine has 110K on it.
thanks for reply.
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Old 05-21-2010, 10:19 AM
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Yes its common on all the gm4.3s the lower intake gasket will either breach since they used a nylon gasket with very little gasket or the rtv seals leak. They most commonly leak at the front and back of the intake near the bolts holding it down. I just changed mine because it was leaking out some and into the crankcase; the old gasket is a joke compared to the fel pro perma seal gasket.
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Old 05-21-2010, 09:15 PM
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PORTCQB is absolutely correct. The stock intake manifold gaskets are garbage. I just changed mine on my 2000 Jimmy and the felpro gasket are great. Clean anti freeze off of intake and put a pressure tester on it and pressurize your cooling system and you will find the leak real quick. Good luck!
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Old 05-22-2010, 11:20 AM
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Thank you guys for your help!
Old 05-22-2010, 11:20 AM
 
 
 
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anti, antifreeze, blazer, cheverlot, chevrolet, chevy, engine, freeze, intake, leak, leaking, manifold, motor, top, youtube


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