Is there a correlation between adding Prestone antifreeze to vortex engines and leaking intake manifold gaskets?

Answer 1

I wouldn't think so. If it is a Vortec 350 engine made after 1996 it should have the hard plastic gasket with the rubber type sealing surface. If they are leaking fluid the intake is not torqued correctly to the heads.

AnswerIn the last four weeks I purchased Prestone(The label said mixes with all antifreezes)and added it to my 1999 Suburban and my 1996 GMC Jimmy. This week both vehicles are leaking under the lower intake manifold. They haven't been leaking prior to this. That was the reason for my question. AnswerI too have recently put the new Prestone anti-freeze in both my 1994 and my 1997 Suburbans. I drained both systems entirely before refilling. Just a habit I got into early on with anti-freeze. But I have yet to have a problem on either vehicle. AnswerCan you tell me how to remove the Power Steering pump pulley? What I am curious about is the hex head bolt in the center of the pulley. I have pulled on it to the point of fear of breaking it. Assuming it is a right hand thread.I have a puller, but I assume I must first remove the bolt. AnswerOk. The hex in the center of the power steering pulley is part of the shaft for the power steering pump. It is made that way so the internals of the pump can be disassembled. So there is not any reason to mess with it pulling that pulley off. The pulley itself is a full .002 press fit so it is going to be tighter than you think. Make sure you put a rag over the top of it and you have safety glasses on when you try to pull it. I have in the past got the puller as tight as I could get it and popped the puller in the front. Once you get that first initial "pop" it comes relatively easy.

Good luck.