Question about 1998 Chevrolet Monte Carlo

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1998 monte carlo coolant

I have not had this car overheat to my knowledge. orginally i thought the water pump was bad. it started to leak one day from what apeared to be the water pump. i changed the water pump( more than once),and the leak is still there. i have been under and above this motor. it appears to be leaking just behind the power steering pump to the left of the water pump. i have tried to locate the leak to no avail. it leaks while the vehicle is running and while it is off. also have ran it while it has been leaking but does not overheat. i dont know but do not believe it to be freeze plug. i have researched on the web but no definitive clear answer.
Thanks

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  • jashleylawn Nov 26, 2008

    I too have a coolant leak, and have changed the water pump. The water pump was leaking and was easy to change. The housing stays in place.The new impeller, gasket, and a tube of sealant is all you need. The sad thing is, the gasket was the whole problem. But if your going to go to that measure, might as well change the impeller.

    Now, I still have a leak in the center area of the engine. I assume this intake gasket is the problem. Too cold out to check it myself. Any body know a good mechanic in northern detroit area?

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I just did a lower intake reseal on my 98 monte's 3100, it's not tough to do, the biggest part is paying attention to what pushrod came from what position and ensuring they go back to where they came from, not only for wear patterns, but for different lengths on the intake and exhaust push-rods.

I work for a GM dealer in northwest montana, and I can say it's not cheap labor-wise, generally around 6 hours of labor and around 300 in parts...it can add up quick, but when those intakes start leaking oil and coolant, things can go sour quickly...espeically if coolant starts leaking into the engine, not good for bearings.

Dex cool is not the problem with these gaskets leaking, it's common on 3100's, 3400's, 3300's, etc, any motor from that series that has that style of lower intake is prone to the issue, the rubber/plastic/composite will eventually warp, break down, crack, seperate from hot and cold cycles, I've seen it all too many times. Dex cool is the best coolant out there, there's a reason that prestone, peak, zerex can't compete, in fact a few of those blends are blends that are less efficient that Dex that GM decided not to patent. But the Dex patent is due to run out soon to the point everyone can start using dex. One issue with dex is the "gum-up" problem when the mixture is not ideal and the level is left low, but flushing and setting proper mixture (50/50) and level will alleviate this problem.

Posted on Dec 09, 2008

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Intake manifold gasket. Flush the system thoroughly, change (or have changed) the upper intake manifold gaskets, and start running old-fashioned green coolant like Prestone, Peak, Zerex, etc. The problem is that GM started using the red Dex-Cool coolant in the mid-90s and it's incompatible with the rubber in the factory gaskets. If you REALLY want to make sure this never happens again, replace the gaskets with this aftermarket product: http://www.dsengine.com/gmgasket/index.html

Posted on Sep 12, 2008

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If you have a 3.1 liter engine our intake leaking its a problem on those gm good luck pierre

Posted on Jun 23, 2008

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