Question about 1999 Chevrolet Silverado 1500

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Oil in the water (radiator) 1996 Vortec 350 Chevy Z71 4x4

I have a 96 Chevy 4x4 Z71 with the vortec 350. I just bought the truck and it had a leaky freeze plug. The truck ran but I had it towed home anyway. I replace the freeze plug, just drove it for the first time and it drives great, runs strong, everything is good including the running temp. I put fresh oil and filter and brand new antifreeze in it. When I opened the radiator cap to make sure the level was right, there was oil in the water (unlike the other guy you helped that had water in the oil). I am very perplexed. The new green antifreeze appears brown now and when I felt it, it is clear there is oil in it. I didn't drain the entire system when I changed the freeze plug, just added the antifreeze. But when I took the freeze plug out, the water that came out appeared pretty clear (can't say for sure, but I didn't think there was oil in it). Any help is appreciated. Thank you, Tony tonmar@rsaa.com

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  • tonmar Apr 15, 2009

    Thank you goofduck, I will try to flush the cooling system.  Any flush products that you would recommend?  I checked the oil but didn't see any signs of water on the dip stick.  The truck ran cool and great and very smooth.  I drove it about 10 miles.

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I would try to flush the cooling system completely
if I had to guess someone put stop leak in it when the freeze plug started leaking
also check the oil to make sure there is no water in the oil

Posted on Apr 15, 2009

  • Jeff Adkisson
    Jeff Adkisson Apr 15, 2009

    all of them are about the same just follow the directions and be careful not to burn yourself

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