Question on Dex-Cool

Question on Dex-Cool

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By wagonwrench - 15 Years Ago

Doing a complete rebuild on '55 Ford pickup with 292 engine. Everything boiled out, i.e. block -radiator etc. Would using Dex-Cool antifreeze cause any problems with this engine? Seems this antifreeze is longer lasting than conventional. Thanks

By HT32BSX115 - 15 Years Ago

Howdy,

You'll hear all sorts of horror stories about DEXCOOL.

I switched my 94 GMC 6.5L Suburban to Dex about 10 years ago and have had no problems in over 100000 miles............. My John Deere F935 diesel mower 4 years ago or so, no problems..... 3 months ago I did my 2001 VW TDI in DEXCOOL.....no problems.

I did my mother in laws 98 Taurus a few years ago and the whole cooling system nearly clogged with orange sludge!!! The heater core was completely clogged and wouldn't work at all. I had to flush everything to get it all out, and I then switched it back to "regular" AF......I still need to flush it again.....

I suspect I didn't get the Taurus flushed completely. ANY little bit of the other type of AF remaining in the system will cause a chemical precipitation that is NOT pretty!!!

When I put my 292 together, I plan to use DEXCOOL since everything is clean and dry.

Cheers,

Rick

By PWH42 - 15 Years Ago

My father-in-laws Buick with 46,000 miles started running hot and the heater wouldn't put out much heat.I took a look at it for him and the cooling system was full of pinkish-orange jelly.It took the Buick dealer three vigorous flushes to clean out so we could put real anti-freeze in it.

The last big truck that I bought was a Volvo with a Cummins engine.The first time I took it to the Cummins shop they were horrified to find it had Dex-cool in it and told me to get it changed immediately.With that stuff in there,getting warranty work from Cummins would be a chancy affair.

That's my experience with Dex-Cool.

By crenwelge - 15 Years Ago

I buy Fleetguard in 55 gallon drums and use it in my Cummins engines as well as in my old jalopies. If a Cummins dealer is Horrified about other coolants, possibly he should read this service bulletin. http://www.fleetguard.com/pdfs/product_lit/americas_brochures/SB_TB03-05-2.pdf

By Ted - 15 Years Ago

Dex-Cool in particular is overly sensitive to any entrapped air in the cooling system. Air in combination with temperature and pressure increases the propensity for this coolant to coagulate or thicken over a period of time. If using it, then be sure you have a working coolant recovery system that allows the radiator to stay purged of air.