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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

'96 Chevy Silverado, Intake Manifold Leak

Q: The intake manifold gasket failed in my '96 Chevy Silverado. What caused the leak? Was it the incompatibility of the Dex-Cool anti-freeze and the gasket or mixing the red Dex-Cool antifreeze with normal green antifreeze?

- John Bradley

A: First, you should never mix the GM type red/orange colored antifreeze Dex-Cool with the green anti-freeze that most people are familiar with. The green anti-freeze will cause the red/orange Dex-Cool to degrade and not perform as designed. Now there are some concerns that you should be aware of. We have found that Dex-Cool, which is rated for 5 years or 100k miles, is not always making it to the 5 yr. or 100k mark. This coolant can go bad and when it does it gets real nasty and creates a pile of problems. I guess what I'm saying is do not be lolled in to believing that service is not required. Regular testing and inspection of the cooling system with Dex-Cool is a must. As we all know, what works great in the lab often has contrasting results in the real world.

 
     
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