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IMHO Posted by Kevin K [Email] ![]() ![]() In Reply to: You know, Kevin, I just replaced mine because >, ChipJ, Sat, 7 Apr 2001 17:01:38 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Townsend presented little to quantify any benefit.
I have a healthy cooling system. My fans have not been on for months (mid-atlantic). In the summer, stuck in traffic, they come on at about 2/3 on gage. In very hot weather, ac on, gage stays near half. There just aren't many cycles up there to worry about, and occasion extra 20F is trivial, considering full ave temp cycles, and local hot zones bounding combustion chambers when at wot.
If 82C switch is used on a healthy system, fans come on needlessly when t-stat barely opens, esp in summer.
If rad is fouled (as they usually do) to some degree, the diff in temps between the switch and t-stat increases, and max coolant temp rises, as per gage. In these cases, as a band-aid, the lower temp switch has a place.
My preference would be to install a new oem 92C switch to the upper rad hose, and run wire extensions to it, for more accutate control of coolant temp, rad fouled or not, summer or winter. Max temp will also be lower than oem set-up. I'd just use the upper left oem fan-switch for the AC ko switch, or mabe just eliminate it (you should notice a problem when gage hits between gr and red with ac on).
Lots of modern engines have alum heads, and elec fans, and all these cooling systems are designed to have an operating range between t-stat open and fan trip. If a gage is provided, most of these will be non-linear, and stationary in the operating range.
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