Question about 2001 Chevrolet Suburban

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2001 Suburban going thru coolant

Hi, I've got a 2001 Suburban that we bought used last fall. It has 165,000 miles on it and runs strong. However, I've had to add coolant (Dex-Cool) to it about 3 times over the last few months (low coolant light keeps coming on). However, no coolant appears to be leaking onto the ground?? Any ideas where the coolant could be going or what's causing it to go? The vehicle never overheats nor does the temp gauge move out of the mid-range on the gauge. Thanks, Jeff

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The most common sources of leaks that I see on these are where the water pump bolts to the block, the weep hole on the water pump itself, and the seam at the plastic end tank of the radiator [inlet end of radiator]. You'll almost never see any coolant drip on the ground from any of these leaks because of where they are, how slow they leak, and the fact that when the engine is hot the coolant vaporizes about as fast as it can leak. I have a tool that I put on in place of the radiator cap which allows me to pressurize the cooling system to about 17 psi. If its an especially tough one to find I'll leave pressure on the system overnight and come morning the leak is usually quite evident. I'd start by looking at where the water pump bolts to the block as the gaskets there are prone to leaking the most. Good luck, hope you find your leak!

Posted on Jul 16, 2010

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The only reason you loose coolant with no apparant leaks is because you have a leaking head gasket.
Dexcool is very corrosive and eats gaskets. Most people that are aware of this replace it with the green coolant ASAP.
Do a search on dexcool problems and you will be amazed at the complaints and recomendations for class action lawsuits.
With 165,000 miles it also possible its just time. Things do break for no reason other than wear and tear.

Posted on Jul 16, 2010

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