New developments in cooling technology are helping reduce maintenance costs. Vince Ursini, Kysor/Cadillac, Cadillac, Mich., explained that extended service interval (ESI) coolants are needed to minimize maintenance and eliminate issues with proper Supplemental Coolant Additive (SCA) levels. High levels can cause water pump seal leaks or solder corrosion and excessively low levels can cause liner pitting, he said.
Maintaining SCA levels requires topping off with either water or low silicate antifreeze that is not fully formulated. Also, depleting SCAs are difficult to test and add.
Traditional coolants generally require supplemental coolant additives at 20,000 mile intervals; extended service interval coolants are said to be capable of delivering 150,000 to 200,000 miles.
Engine coolant categories include:
* conventional (low silicate antifreeze with SCA package);
* conventional fully formulated; and
* Extended service interval (ESI)/Long Life.
The two current ESI coolants are the conventional SCA timed release which use an ESI filter and organic acid technology, but others soon to folllow, Ursini said.
KLLLM Transport Servicem,Misss., ises the more expensive EsI organic acid coolant because provides a longer wate3r pump and thermostat life, and eliminate coolant disposal. In addition, It elilminates pluged radiators, reqeiure little addditives, increase aluminum and reduce scale and deposite built up . KLLm reports an overall sabving due to ESI Coolant.
Fully-formulated antifreeze and coolants consist of ethlyn Glycol, antifreeze (95 percent minimum glycol, and preduleted coolant (50 percent antifreeze with purified water0> All variation contain a fyull prechange of SCA top protect cylinder liners.
The fill-for life method consists of a fully-formulated antifreeze mixed with pure water,50/50 mix, which is low in chlorides and hard-ness. The result is a pre-charged coolant with a -34 degrees F freeze point. An ESI coolant filter is used and the system runs 12-18 months or 100,000 to 150,000 miles before requiring a filter change.
Advantages include antifreeze availability and compatibility, ease of testing with readily available test kits and low purchase cost.
Why should you use extended-life carboxy-late-based engine coolants?
* Easy maintenance, due to the low inhibitor depletion, improved stability with hard water, improved coolant compatibility and low toxici-ty.
* Maintenance of high-quality heat transfer and high temperature corrosion protection for alloys.
* Hardware endurance which provides for long water pump seal life.
Further characteristics include limited depletion, compatibility and performance.
However, some limitations are depleting inhibitors (extender additions at long inter-vals), foam and cavitation [original equipment manufacturers (OEM) nitrite requirement for additional security]. It sounds complicated, but checking your coolant practices is impor-tant. >B
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Shred-Tech Chicago, Mount Prospect, Ill., has moved their Wood Dale, Ill., office to a new location. The new address: 1907 Busse Rd., Mount Prospect, Ill. 60056. (800) 323-1265. Fax: (847) 589-8102.
Jacobs Vehicle Equipment Co., Bloomfield, Conn., has established a home page on the Internet: http:// www.jakebrake.com.