cxn613 Posted November 4, 2013 Share Posted November 4, 2013 Rd690s fan clutch runs all the time. Temp stays at 180 Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/ Share on other sites More sharing options...
KECorbin22 Posted November 5, 2013 Share Posted November 5, 2013 Test your fan clutch solenoid for volts, check your air supply to solenoid and to your fan clutch, fan clutch could be shot. Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-215091 Share on other sites More sharing options...
staxx Posted November 5, 2013 Share Posted November 5, 2013 Check the a/c high psi switch ,it will turn fan on also. Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-215140 Share on other sites More sharing options...
cxn613 Posted November 5, 2013 Author Share Posted November 5, 2013 This clutch is different than our ch's. This has no air line going to it. Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-215164 Share on other sites More sharing options...
staxx Posted November 5, 2013 Share Posted November 5, 2013 Electronic viscous Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-215180 Share on other sites More sharing options...
cxn613 Posted November 5, 2013 Author Share Posted November 5, 2013 Can this still be the ac switch or clutch shot Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-215182 Share on other sites More sharing options...
staxx Posted November 5, 2013 Share Posted November 5, 2013 Both , a/c high psi switch and coolant temp can both turn fan on or programming issues wire connections grounds etc. or fan drive Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-215216 Share on other sites More sharing options...
gearhead204 Posted November 7, 2013 Share Posted November 7, 2013 electronic viscous ? when did they do this , how do they do this. sorry guys been back on the farm too long never heard of this invention Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-215564 Share on other sites More sharing options...
mclow Posted November 11, 2013 Share Posted November 11, 2013 If it is a viscous clutch it works off of heat.... there are no electronics to it. At least on my 94 RD690s there isnt Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-216204 Share on other sites More sharing options...
staxx Posted November 11, 2013 Share Posted November 11, 2013 electronic viscous has solenoid in fan that opens or closes to allow fluid to slowly couple the fan at different % rates also has hall effect sensor inside to determine rpm of fan. Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-216206 Share on other sites More sharing options...
gearhead204 Posted November 12, 2013 Share Posted November 12, 2013 staxx thank you for the answer. so does it completely disengage? or like a standard viscous; and run at a low % of eng. rpm. has any one retro fitted it to older engs.? my e9 runs too cool most of the time I thought I had a bad thermostat but changed both and no improvement. guess I might have to find a set of shutters Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-216244 Share on other sites More sharing options...
staxx Posted November 12, 2013 Share Posted November 12, 2013 Would not work on a older truck , needs to be v-macIII or newer 97-98 newer . this needs a computer to monitor and run correctly. But there is a two stage air on off fan that would work very well for you.And no the electronic fan will not completely disengage . Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-216279 Share on other sites More sharing options...
gearhead204 Posted November 14, 2013 Share Posted November 14, 2013 staxx thank you for the explanation is the air clutch a Horton or other brand 1 Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-216648 Share on other sites More sharing options...
daisyjohn Posted November 14, 2013 Share Posted November 14, 2013 Check your heater hoses, thermostat, and radiator maybe. Quote Link to comment https://www.bigmacktrucks.com/topic/33375-fan-clutch-always-running/#findComment-216657 Share on other sites More sharing options...
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