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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.
 
 

Miscellaneous
Acura
Audi
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Chevy
Chrysler

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Ford
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Lincoln - Mercury
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  Jim Grant's Tech Tips

Radiator Fluid Mixing, A Big No-No

Q: Can I mix GM Dex Cool with conventional coolant? I have heard that if the two are mixed together they will gum-up.

- Danny

A: Never mix a long/extended life anti-freeze with what is becoming the old type green anti-freeze. We are seeing a mixing problem not only with GM’s long life but with many other manufacturers as well. Not only US but also many of the Asian and European vehicles now specify a long life coolant that is not compatible with commonly known used green anti-freeze. If you mix the different coolants, you’re looking for trouble. In the event you do mix the two have the cooling system drained and flushed. It may even take a couple of system flushes to rid the bad mix. In today’s vehicles you have to know what you’re adding to the cooling system; it’s not a simple as it use to be.

 
     
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