riderman523 Posted May 2, 2015 Share Posted May 2, 2015 Granite 2014 mp8..at idle my ac gets real warm..when i rev it the temp drops... i am guessing it needs the fan to cool the condensor. Is there any way I can install a switch to keep the fan clutch on all the time at idle? It doesnt seem to activate by an air switch like my 2007 did. Quote Link to comment Share on other sites More sharing options...
tjc transport Posted May 3, 2015 Share Posted May 3, 2015 take it back to the dealer, the pressure switch jumper was probably not put in when built. i have seen 4 of them missing th ejumper in the past 11 months. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment Share on other sites More sharing options...
riderman523 Posted May 3, 2015 Author Share Posted May 3, 2015 Can i install the jumper myself? My boss will not bring it to the dealer for that because they take weeks to do the smallest repair to our trucks. Quote Link to comment Share on other sites More sharing options...
tjc transport Posted May 3, 2015 Share Posted May 3, 2015 yes you can, you simply need the connector that goes from the pressure switch on the reciever drier to the wiring harness to engage the fan.plug it in both ends and you are done. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment Share on other sites More sharing options...
riderman523 Posted May 3, 2015 Author Share Posted May 3, 2015 does this connector have to be from mack or can i rigg one up? Quote Link to comment Share on other sites More sharing options...
tjc transport Posted May 3, 2015 Share Posted May 3, 2015 either way. as long as the switch is connected.when the pressure in the AC gets high enough, it turns the fan on to help dissipate the heat, which will lower the high side pressure. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment Share on other sites More sharing options...
riderman523 Posted May 4, 2015 Author Share Posted May 4, 2015 Its mp8.... No pressure switch on the dryer.. Cant find any switch on the hi pressure lines..any place else i could find the switch? Quote Link to comment Share on other sites More sharing options...
Wrongway Posted June 14, 2015 Share Posted June 14, 2015 Mine is doing the same thing. We really need to figure this out! I just post a thread titled New truck, no ac, dealer says its normal? Quote Link to comment Share on other sites More sharing options...
riderman523 Posted June 20, 2015 Author Share Posted June 20, 2015 It turns out the engine fan wasnt coming on to cool the condensor so the dealer installed a switch so i can turn the(clutch) fan on any time. my ac stays cold as ever at idle now. Quote Link to comment Share on other sites More sharing options...
wilbur Posted June 21, 2015 Share Posted June 21, 2015 If your sitting around ideling your not making Money. Hammer down. Quote Link to comment Share on other sites More sharing options...
riderman523 Posted June 22, 2015 Author Share Posted June 22, 2015 ^^ Oh yes I am....Concrete mixers sit idle some times for hours in a day Quote Link to comment Share on other sites More sharing options...
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