Creek Posted January 12, 2017 Share Posted January 12, 2017 (edited) I have a 2005 Mack Vision the temp runs 198 deg when pulling a load the temp goes to 200 deg and the cooling fan comes on and it stays on the temp never drops below 195 has new thermostats egr cooler ,ecm fan clutch was rebuilt about a yr ago it has an air fan please help the cooling fan is annoying running all the time also a new elephant pipe and screen. also pushes a gal of coolant in 500 miles. Edited January 12, 2017 by Creek Quote Link to comment https://www.bigmacktrucks.com/topic/48326-cooling-fan/ Share on other sites More sharing options...
Dirtymilkman Posted January 12, 2017 Share Posted January 12, 2017 I'd start with a thermostat if that hasn't been done. But at that age your radiator could be plugged or the cores are just getting rotten. We've re-cored quite a few with the heavier aftermarket cores and had great luck. Quote Link to comment https://www.bigmacktrucks.com/topic/48326-cooling-fan/#findComment-358075 Share on other sites More sharing options...
fjh Posted January 12, 2017 Share Posted January 12, 2017 It could be the AC switch and The solenoids are also prone to failure even new out of the box we have had a rash of bad ones lately Unplug the green AC switch and wait a minute or so if the fan shuts down that could b your problem. Quote Link to comment https://www.bigmacktrucks.com/topic/48326-cooling-fan/#findComment-358094 Share on other sites More sharing options...
Mackpro Posted January 12, 2017 Share Posted January 12, 2017 Remove after cooler and clean front of radiator fins. We see lots of clogged radiators between aftercooler and radiator. Farm trucks are the worst about this Quote Link to comment https://www.bigmacktrucks.com/topic/48326-cooling-fan/#findComment-358095 Share on other sites More sharing options...
Creek Posted January 13, 2017 Author Share Posted January 13, 2017 21 hours ago, Mackpro said: Remove after cooler and clean front of radiator fins. We see lots of clogged radiators between aftercooler and radiator. Farm trucks are the worst about this During lube sevice I had tech check upper and lower hoses upper hot lower cold seems like a flow problem. Quote Link to comment https://www.bigmacktrucks.com/topic/48326-cooling-fan/#findComment-358246 Share on other sites More sharing options...
Dirtymilkman Posted January 14, 2017 Share Posted January 14, 2017 16 hours ago, Creek said: During lube sevice I had tech check upper and lower hoses upper hot lower cold seems like a flow problem. That's a cooling problem, not a flow problem. Quote Link to comment https://www.bigmacktrucks.com/topic/48326-cooling-fan/#findComment-358353 Share on other sites More sharing options...
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