D3logistics Posted May 26, 2016 Share Posted May 26, 2016 Last couple of days has been warm. With a full load on, the temperature gage has been creeping into the red and the idiot light comes on. I have managed to get the temperature down pretty quickly but I would like tofind out what the problem is and fix it. Not overly mechanical here but getting better with every mile I spend in a Mack LOL Quote Link to comment https://www.bigmacktrucks.com/topic/45381-99-rd-688s-running-hot/ Share on other sites More sharing options...
bts-4120 Posted May 27, 2016 Share Posted May 27, 2016 radiator stopped up with bugs and dust? Quote Link to comment https://www.bigmacktrucks.com/topic/45381-99-rd-688s-running-hot/#findComment-334635 Share on other sites More sharing options...
41chevy Posted May 27, 2016 Share Posted May 27, 2016 1 hour ago, bts-4120 said: radiator stopped up with bugs and dust? Or the AC Condenser in front of the rad. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/45381-99-rd-688s-running-hot/#findComment-334644 Share on other sites More sharing options...
fjh Posted May 27, 2016 Share Posted May 27, 2016 16 Year Old Rad !May be this needs cleaning inside after 16 years Quote Link to comment https://www.bigmacktrucks.com/topic/45381-99-rd-688s-running-hot/#findComment-334662 Share on other sites More sharing options...
j hancock Posted May 27, 2016 Share Posted May 27, 2016 Or are all the cooling fins falling off the outside of the radiator? Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/45381-99-rd-688s-running-hot/#findComment-334679 Share on other sites More sharing options...
Mack Technician Posted June 6, 2016 Share Posted June 6, 2016 Any or all the above.......Top up coolant, clean the radiator, swap out the thermostat, check viscous fan by spinning (engine off) to confirm it has resistance, or unplug the A/C high pressure switch to manually turn engine fan on and off (switch is on right side close to top bolt of radiator support member). Last effort, have a radiator shop "rod out" plugged core or replace radiator. Quote Link to comment https://www.bigmacktrucks.com/topic/45381-99-rd-688s-running-hot/#findComment-335721 Share on other sites More sharing options...
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